PS Engineering PAC24 Specifications

9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PAC24
Audio Control Panel and Intercom System
Document P/N 200-240-0008
Revision 7 June 2003
Audio Control Panel
Intercom System
Installation and Operation Manual
Patent No. 5,903,277 and 6,160,496
FAA-Approved TSO C50c
JAA-Approved JTSO C50c
In certified aircraft, warranty is not valid unless this product is installed by an
Authorized PS Engineering dealer.
PS Engineering, Inc. 2002 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written permission of PS Engineering, Inc. is strictly prohibited. For further information contact the Publications Manager at PS Engineering, Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone (865) 988-9800, email avionics@ps-engineering.com.
Table of Contents
SECTION I GENERAL INFORMATION........................................................................ 1-1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
INTRODUCTION........................................................................................................... 1-1
SCOPE ............................................................................................................................. 1-1
EQUIPMENT DESCRIPTION ..................................................................................... 1-1
APPROVAL BASIS -...................................................................................................... 1-2
SPECIFICATIONS......................................................................................................... 1-2
EQUIPMENT SUPPLIED ............................................................................................. 1-3
EQUIPMENT REQUIRED BUT NOT SUPPLIED .................................................... 1-4
LICENSE REQUIREMENTS ....................................................................................... 1-4
SECTION II - INSTALLATION........................................................................................ 2-1
2.1 GENERAL INFORMATION ........................................................................................ 2-1
2.1.1 SCOPE ........................................................................................................................... 2-1
2.2 UNPACKING AND PRELIMINARY INSPECTION ................................................................ 2-1
2.3 EQUIPMENT INSTALLATION PROCEDURES .................................................................... 2-1
2.3.1 COOLING REQUIREMENTS .............................................................................................. 2-1
2.3.2 INTERNAL DIP SWITCH CONFIGURATION ...................................................................... 2-1
2.3.3 MOUNTING REQUIREMENTS........................................................................................... 2-5
2.3.4 MOUNTING RACK INSTALLATION .................................................................................. 2-5
2.3.5 TRAY AND CONNECTOR ASSEMBLY .............................................................................. 2-5
2.4 CABLE HARNESS WIRING ............................................................................................... 2-6
2.4.1 NOISE ............................................................................................................................. 2-6
2.4.2 EXISTING KMA 24H INSTALLATION ............................................................................. 2-6
2.4.3 POWER ............................................................................................................................ 2-7
2.4.4 COMMUNICATIONS PUSH-TO-TALK (SINGLE PANEL INSTALLATION) ............................ 2-7
2.4.5 AUDIO PANEL INTERFACE .............................................................................................. 2-7
2.4.6 TRANSMIT INTERLOCK ................................................................................................... 2-7
2.4.7 "SWAP" MODE................................................................................................................ 2-7
2.4.8 BACKLIGHTING .............................................................................................................. 2-7
2.4.9 UNSWITCHED INPUTS ..................................................................................................... 2-8
2.4.10 PA MUTE (J3, PIN 8) .................................................................................................... 2-8
2.4.11 PUBLIC ADDRESS (J3, PIN B) ....................................................................................... 2-8
2.4.12 INTERCOM WIRING ....................................................................................................... 2-8
2.4.13 ENTERTAINMENT INPUT (J3 PIN 7) .............................................................................. 2-8
2.4.14 INTERCOM EXPANSION (J3, PINS 22, 23 AND A) .......................................................... 2-9
2.4.15 PLAYBACK BUTTON INSTALLATION (PIN 2- OPTION 1 UNITS ONLY)........................... 2-9
2.5 ADJUSTMENTS .................................................................................................................. 2-9
2.6 COMMUNICATIONS ANTENNA INSTALLATION NOTES ................................................ 2-10
2.7 WIRELESS TELECOMMUNICATIONS INTERFACE ......................................................... 2-10
2.8 PAC24 PIN ASSIGNMENTS ............................................................................................. 2-11
2.9 POST INSTALLATION CHECKOUT ................................................................................. 2-12
2.10 UNIT INSTALLATION .................................................................................................... 2-12
2.10.1 OPERATIONAL CHECKOUT ......................................................................................... 2-12
2.11 INTERNAL RECORDER CHECKOUT (OPTION 1 UNITS ONLY).................................... 2-13
2.12 FINAL INSPECTION....................................................................................................... 2-13
SECTION III OPERATION ............................................................................................... 3-1
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
3.1
3.2
3.3
3.3.1
3.3.2
3.4
3.4.1
3.4.2
3.4.3
3.4.4
3.5
3.5.1
3.5.2
3.6
3.6.1
3.6.2
3.6.3
3.7
3.7.1
3.7.2
3.7.3
3.7.4
3.8
3.9
3.9.1
3.9.2
SCOPE ............................................................................................................................. 3-1
PAC24 CONTROLS........................................................................................................... 3-1
POWER SWITCH (3) (EMG-FAIL SAFE OPERATION) .................................................... 3-1
SINGLE PANEL FAIL SAFE OPERATION .......................................................................... 3-1
DUAL PANEL FAIL SAFE OPERATION ............................................................................. 3-2
MICROPHONE SELECTOR (2) .......................................................................................... 3-2
TELEPHONE OPERATION ................................................................................................ 3-2
STUCK MICROPHONE PROTECTION ................................................................................ 3-2
SWAP MODE (REMOTE TRANSFER OF COM TRANSCEIVERS).......................................... 3-2
OBSERVER TRANSMIT SELECTION (PART NUMBER –0400 SERIES)................................. 3-2
RECEIVE AUDIO SELECTOR (1)....................................................................................... 3-3
SPEAKER AMPLIFIER (4)................................................................................................. 3-3
KEY “CLICK”.................................................................................................................. 3-3
SPLIT MODE ..................................................................................................................... 3-3
SPLIT MODE, SINGLE PANEL .......................................................................................... 3-3
SPLIT MODE, DUAL PANEL ............................................................................................ 3-4
SPLIT MODE, OBSERVER PANEL (-04XX) ..................................................................... 3-4
INTERCOM OPERATION ................................................................................................... 3-4
INTELLIVOX® VOX-SQUELCH ....................................................................................... 3-4
VOLUME CONTROL (3)................................................................................................... 3-5
INTERCOM MODES (5).................................................................................................... 3-5
ENTERTAINMENT INPUT ................................................................................................. 3-5
TELEPHONE MODE .......................................................................................................... 3-6
INTERNAL RECORDER SYSTEM (OPTION 1 UNITS ONLY) ............................................ 3-6
OPERATION .................................................................................................................... 3-6
CONCURRENT MESSAGES .............................................................................................. 3-6
SECTION IV- WARRANTY AND SERVICE.................................................................. 4-1
4.1
4.2
WARRANTY ...................................................................................................................... 4-1
FACTORY SERVICE .......................................................................................................... 4-1
APPENDIX A – INSTALLATION DRAWING ...........................................................A
APPENDIX B SINGLE INTERCONNECT WIRING ........................................................ B
APPENDIX B DUAL INTERCONNECT WIRING............................................................ B
7.1
7.2
DUAL PAC24 WIRING WITH OBSERVER CONFIGURATION UNITS .....................................
DUAL PAC24 WIRING WITH OBSERVER CONFIGURATION AND EXPANSION UNITS ..........
APPENDIX C- INSTRUCTIONS FOR FAA FORM 337 AND CONTINUING
AIRWORTHINESS ....................................................................................................................C
8.1
8.2
INSTRUCTIONS FOR FAA FORM 337, AUDIO PANELS .........................................................
INSTRUCTIONS FOR CONTINUING AIRWORTHINESS, AUDIO PANELS ................................
APPENDIX D – RTCA DO160D (EUROCAE ED-14) ENVIRONMENTAL
QUALIFICATION FORM.........................................................................................................D
200-240-0008
Page ii
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section I GENERAL INFORMATION
1.1
INTRODUCTION
The PAC24 represents the finest in high-performance cockpit audio control and intercommunications. Using proprietary IntelliVox® design, this unit eliminates the requirements for intercom squelch adjustments.
The unit is designed for outstanding ergonomics and visually defined mode annunciation and selection.
The PAC24 was designed to be a dual audio panel, offering convenience and utility for two-pilot crews, in
installations where a single panel is not practical.
Before installing and/or using this product, please read this manual completely. This will ensure that you
will take full advantage of all the advanced features in the PAC24.
1.2
SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PAC24-series
of Audio Selector Panel/Intercom Systems. This includes the following units:
Model
Description
Part Number
PAC24
Standard
050-240-0100
PAC24
Option 1, w/ Recorder
050-240-0200
PAC24
Observer
050-240-0400
PAC24
Observer Configuration with recorder
050-240-0401
Where the functions are identical to all units, it will be referred to herein as a PAC24. Otherwise, the applicable units will be specified.
1.3
EQUIPMENT DESCRIPTION
The PAC24-series is a state of the art audio isolation amplifier and audio selector that contains an automatic voice activated (VOX) intercom system. It can switch up to five transceivers (Com 1, Com 2 Com 3
Com 4 and Com 5) and 4 receivers (Nav 1, Nav 2, AUX and MKR).
The Duplex Telephone mode allows the PAC24 to act as an audio interface between aircraft headphone
and microphones and specific aircraft approved (FAA/FCC) cellular telephone equipment.
Warning: Use of non-aviation approved cellular telephone equipment may be prohibited by regulation.
PS Engineering is not responsible for unauthorized airborne use of cellular telephones.
For airborne use, the PAC24 must be interfaced with the AirCell system.
There are two unswitched inputs, for autopilot disconnect, and/or radar altimeter warning. Push buttons
select the receiver audio source provided to the headphones. A SPR switch allows the user to listen to the
receiver(s) selected on the cabin speaker. Except for the unswitched inputs, all speaker audio is muted during transmit.
Push button switches select the communication transceivers in use for the pilot and copilot position, and
allow radio transmission. In "Split Mode" the PAC24 has the ability to allow the pilot and copilot to operate different transceivers independently. The Com 5/TEL mode (selected at installation) allows the pilot to
use the audio panel for duplex operation, such as with aviation-specific cellular telephones.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any
reason, or if the power switch is placed in the Off (Fail-safe) position.
200-240-0008
Page 1-1
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
A voice activated (VOX) intercom is included in the PAC24. This system has PS Engineering’s exclusive
IntelliVox® circuitry that eliminates manual adjustments. The system contains six separate VOX mic circuits, and only opens the specific microphone channel in use.
The intercom system incorporates pilot isolate and crew modes, a monaural music input with "Soft Mute,"
and LED indicators transmit indications. Intercom control is through front panel-mounted knob and 3 position mode switch. A single volume controls intercom level for the pilot and copilot. Passenger headphone
volume is factory set, and adjusted in flight with headset-mounted volume controls. Passenger volume control is further adjustable through screwdriver access in the top of the unit. Intercom squelch is automatic.
The PAC24 is form fit and function compatible with the King Radio KMA24H, part number 066-1055-71,
and may be compatible with 066-1055-70.
1.4
APPROVAL BASIS -
FAA-TSO Approval.
The PAC24 Audio Selector Panels are FAA approved under TSO C50c (Audio Amplifiers). In addition,
the PAC24 is JAA-JTSO approved under LBA.N-O.10.510/003JTSO.
All systems comply with relevant portions of EUROCAE ED-14C/DO-160D (Environmental Conditions and Test
Procedures for Airborne Equipment), ED12B/DO-178B (Software Considerations for Airborne Equipment) and ED18/DO-214 (Audio Systems Characteristics and Minimum Operational Performance Standards for Aircraft Audio Systems).
NOTE: The recorder contained in Option 1 is not TSO-approved, and the installer must determine the relevant approval basis prior to installation. Contact PS Engineering for information regarding FAA approval.
Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
1.5
SPECIFICATIONS
TSO COMPLIANCE
C50c, Class A
RTCA/DO-214
RTCA/DO-160D
RTCA/DO-178B
ENVIRONMENTAL Qualifications:
B1ZCABSRXXXXXXZBBBATMXXE2XXX
Temperature Range:
Operating:
-20ºC to +55ºC with short term operating at +70°C
Storage:
-55ºC to +85ºC
Altitude:
Up to 50,000 feet in a non-pressurized area of the
cockpit.
DIMENSIONS:
Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm)
Depth: 6.8 in. (17.3 cm) behind panel
WEIGHT (With Rack & Connectors):
1.5 lb. (0.54 kg)
Audio Selector/Intercom:
APPLICABLE DOCUMENTS:
200-240-0008
Page 1-2
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Specifications, Continued.
POWER REQUIREMENTS (Including Internal Lighting):
Voltage:
11 to 33 VDC
Maximum Current:
2.5 Amp (Externally protected by a 3 Amp circuit
breaker.)
Typical operating current:
Speaker off:
350 mA
Speaker on, 28V, full radio volume
1.5 A
Audio Selector Specifications
Audio selector panel input impedance:
510 Ω
Input Isolation:
-60 dB (min.)
Speaker Muting:
-60 dB (min.)
Speaker Output (into 4 Ω) with no clipping
3 Watts (min.)
14 VDC:
10 Watts (min.)
28 VDC:
Receiver Inputs:
10
(Com 1, Com 2, Com 3, Com 4, Com 5, Nav 1,
Nav 2, ADF, DME, MKR)
Unswitched Inputs:
2
(examples: GPS WPT, Value, Autopilot Disconnect, Altimeter DH)
Transmitter Selections:
5
(Com 1, Com 2, Com 3 Com 4, Com 5)
Speaker Impedance:
4–8Ω
Headphone Impedance:
150 – 1000 Ω
Headphone Output:
38 mW each headset, no clipping <1% THD
120 mW each headset with < 10% THD into
150Ω
Microphone Impedance:
150 - 600 Ω
Intercom Specifications
Intercom Positions:
Minimum of 5 places (with individual IntelliVox® circuits)
1 (Monaural)
>-30 dB "Soft Mute" when Com or intercom active.
<1% THD @ 38 mW into 150Ω
<10% THD @ 120mW into 150 Ω
300 Hz - 6000 Hz
100 Hz - 18kHz
Music Input:
Music Muting:
Distortion:
Mic Freq. Response, 3 dB:
Music Freq. Response, 3 dB:
1.6
EQUIPMENT SUPPLIED
1 ea. of the following units:
Model
PAC24
PAC24 Option 1
PAC24 Observer
PAC24 Observer Option 1
200-240-0008
Description
PAC24 Audio Control Panel with intercom
PAC24 Audio Control Panel with intercom and digital recorder,
PAC24 Audio Control Panel for Observer installation
PAC24 Audio Control Panel for Observer with recorder
Page 1-3
Part Number
050-240-0100
050-240-0200
050-240-0400
050-240-0401
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
PAC24 Installation Kit: 250-240-0000
Description
Quantity
Part
Number
PAC24 installation rack assembly
Molex Connector Shell w/key, 50 pin, key 17/18
1
1
475-240-0040
120-425-5002
Gold Plated Crimp Pins
4 40 X 7/16 screw w/nylon patch
Grounding bar
6-32 X 3/4 pan head Phillips screw
6-32 Nut Flat
6-32 Lock Nut
Cable Clamp
#6-32 x ½” Flat head Phillips screw
#6-32 Clip Nut
Parts identification sheet
50
4
1
2
2
2
1
6
6
1
425-001-0002
475-440-0008
430-007-0001
475-632-0038
475-632-0003
475-632-0004
625-001-0002
475-632-0012
475-630-0002
002-250-0240
1.7
EQUIPMENT REQUIRED BUT NOT SUPPLIED
a)
b)
c)
d)
e)
f)
g)
h)
1.8
None
Circuit Breaker: 1 ea. 3 amp
Cockpit Speaker, 4 Ω recommended
Cabin or External Speaker 4 Ω recommended
Headphone Jacks (as required)
Microphone Jacks (as required)
Headphones, 150 Ω as required
Microphones, as required
Interconnect Wiring
LICENSE REQUIREMENTS
200-240-0008
Page 1-4
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section II - Installation
2.1
GENERAL INFORMATION
2.1.1
SCOPE
This section provides detailed installation and interconnect instructions for the PS Engineering PAC24Series Audio Control Panel/Intercom System.
Please read this manual carefully before beginning any installation to prevent damage and post-installation
problems. Installation of this equipment requires special tools and knowledge.
NOTE: The PAC24 requires specialized knowledge and tools for an effective installation. An appropriately rated Certified Aircraft Repair Station must install this equipment in accordance with applicable
regulations. PS Engineering, Incorporated warranty is not valid unless the equipment is installed by an authorized PS Engineering, Incorporated dealer. Failure to follow any of the installation instructions, or installation by a non-certified individual or agency will void the warranty, and may result in an unairworthy
installation.
2.2
Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible signs of shipping
damage. Examine the unit for loose or broken buttons, bent knobs, etc. Verify the correct quantity of components supplied with the list in Section 1.6 (B). If any claim is to be made, save the shipping material and
contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or accessories shows any sign of external shipping damage, contact PS Engineering to arrange for a replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned to PS
Engineering for any other reason should be shipped in the original PS Engineering packaging, or other
UPS approved packaging.
2.3
Equipment Installation Procedures
2.3.1
Cooling Requirements
Forced air cooling of the PAC24 is not required. However the unit should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate cooling air provided. Outside, ram air cooling of the unit is not permitted, and may result in damage.
2.3.2
Internal DIP Switch Configuration
The tables below describe the various internal switch selections.
The PAC24 can be easily configured for many different applications. This includes dual audio panel
installations. In a single installation, no action is required. In dual installations, place the DIP witches into
the proper position to configure the PAC24 as the pilot, or copilot panel. By designating a pilot or copilot
panel, the aircraft commander, or pilot, will have priority for transmissions and intercom mode selection.
Note:
Bold=Default settings (as shipped from factory)
Units are shipped as single unit configuration, 28V lighting.
200-240-0008
Page 2-1
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
4
3
2
1
4
3
2
1
S4
S3
4
3
2
1
4
3
2
1
S2
2.3.2.1
S5
Single/Dual configuration
Switch
S5
2
OFF
3
OFF
Single
PAC24
Installation
ON
OFF
Pilot unit –Dual
Installation
Single System/Pilot
ON
ON
Copilot Panel
J4 ON (installed)
J4 OFF (Removed)
J5 Jumper Pins 1 & 2
J5 Jumper Pins 2 &3
200-240-0008
Copilot
unit –Dual
Installation
Page 2-2
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Pin 1
J
5
2.3.2.2
J
4
Pass 3 / Expansion – J3, pin a configuration
As shipped, the PAC24 is 5-place intercom, and the ability to convert the system from a 5-place intercom
to use an expansion unit that will allow up to 8 places on the intercom per audio panel.
Switch
2.3.2.3
S2
3
ON
4
OFF
S3
1
ON
2
OFF
OFF
Pass 1 mic input
ON
Expansion audio
input
Pass 2 / Expansion - J3, pin 23 configuration
Switch
2.3.2.5
ON
Expansion Power
out
Pass 1 / Expansion – J3, pin 22 configuration
Switch
2.3.2.4
OFF
Pass 3 Mic Input
S3
3
ON
4
OFF
Pass 2 mic input
OFF
ON
Expansion audio
output
CVR / IRS Control – J3, pin 2 configuration
PAC24 units can be equipped with an optional Intercom Recording System (IRS), which will store up to 60
seconds of radio traffic (on the transceiver selected for transmit). The playback is a normally open switch
connected to ground, which triggers the stored audio. IRS is incompatible with the standard Cockpit Voice
Recorder output
200-240-0008
Page 2-3
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Switch
2.3.2.6
S2
1
ON
2
OFF
OFF
CVR Output
ON
IRS Playback Input
Backlighting / Swap – J3, pin 18 configuration
The installer has the option of implementing PS Engineering’s patented “Swap” function, which allows the
pilot to switch between Com 1 and Com 2 with an external switch. The Swap command is controlled
through the unused backlight input, and selected by the internal DIP switch.
Switch
2.3.2.7
S4
1
ON
2
OFF
OFF
14 V lighting
control
ON
Backlighting / Swap – J3, pin U configuration
Switch
2.3.2.8
S4
3
ON
4
OFF
OFF
28 V lighting
control
ON
Swap switch
Backlight 14/28V
Switc
h
14 V
28V
1
On
Off
2
Off
On
3
Off
On
4
On
Off
14 V Aircraft
2.3.2.9
Swap switch
28 V aircraft
Pin 18= 14 V input
Pin 18=Swap
Pin U=Swap
Pin U =28 V input
Expansion Mode / Telephone S5 configuration
Switch
S5
1
On
Expansion Unit Present (11906 installed)
4
On
Duplex Telephone mode for Com 5
NOTE: Set both audio panel the same in a dual installation
200-240-0008
Page 2-4
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.3.2.10 Observer Installation Configuration (S5)
When the Observer versions are used (Part Number 050-240-0400, -0401, -0403, -0404) the cockpit unit is
configured as “Pilot” and the Observer station is configured as “Copilot.”
Switch
S5
2
ON
3
OFF
Cockpit unit –
Observer Installation
Switch
1
ON
Observer unit –
Installation
ON
S3
OFF
2
ON
3
OFF
4
ON
Switch
Expansion In enabled
Expansion Out
enabled
S2
3
ON
4
OFF
Pass Input
In an observer unit, jumpers J4 and J5 should be configured like a copilot's unit in dual installation.
2.3.3
Mounting Requirements
The PAC24 must be rigidly mounted to the instrument panel of the aircraft structure and within view and
reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2A. The
unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.
Avoid installing the audio panel close to high current devices or systems with high-voltage pulse type outputs, such as DME or transponders.
NOTE: The mounting hole configuration for the PAC24 is identical to the
KMA-24H -71 Audio Selector Panels.
2.3.4
Mounting Rack Installation
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is between the Com
5 and NAV 1 buttons. Use caution to avoid hitting the photo-detector lens. Carefully slide the unit free of
the tray. Set the unit aside in a safe location until needed. Install the tray using six clip nuts (475-6300002), and six FHP 6-32 x ½" screws (475-632-0012). The audio selector panel must be supported at front
and rear of the mounting tray.
2.3.5
Tray and Connector Assembly
The unit connector mates directly with the circuit board in the PAC24. The connector is a Molex crimptype, and requires the use of a Molex hand crimp tool, EDP P/N 11-01-0203, CR6115B (or equiv.). The
connector is mounted to the unit tray with #4-40 screws (475-440-0008), from the inside of the tray. Ensure that proper strain relief and chafing precautions are made during wiring and installation, using the
200-240-0008
Page 2-5
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
cable clamp (625-001-0002). Secure the ground bar (430-630-0002), if desired using, #6-32 nuts (475-6320003) and #6-32 lock nuts (475-632-0004).
2.4
Cable Harness Wiring
Referring to the appropriate Appendix, assemble a wiring harness as required for the installation. All wires
must be MIL-SPEC in accordance with current regulations. Two- and three-conductor shielded wire must
be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and
soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper installation will
void the PS Engineering warranty.
2.4.1
Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PAC24 power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.8 VDC present at the bottom
connector, pin 25, of the PAC24 for the power supply to work in its designed regulation. Otherwise, it cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon,
electric gyros, switching power supplies, etc.) However, installation combinations can occur where interference is possible. The PAC24 was designed in a RFI hardened chassis and has internal Electromagnetic
Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the
airframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a
minimum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better).Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a
2- or 3-conductor, shield wire as shown on the installation wiring diagram.
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying
power wires. Keep these cables physically separated. It is very important that you use insulated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
Adding a high-performance audio control system, particularly in conjunction with high-performance active
noise canceling headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS
Engineering makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions, particularly with older avionics.
2.4.2
Existing KMA 24H Installation
If the installation replaces a KMA-24H (series –71), and it is properly installed and wired, no other
changes are required except for removal of the keying pin. Other options not present in the KMA24H,
such as entertainment or “Swap” may require additional wiring. Speaker Power (J3, pin 7) is not required.
NOTE
NOTE:
Many installation use external switching to provide crewmember isolation. These can usually be
eliminated. See below for details.
2.4.2.1
Single KMA24H -71 Installation
If the switch, labeled Isolate/Normal/Private is installed, the Primary/Secondary headphone switch should
be maintained. However, the connection to P241, Pins 21, 24, and Y should be removed.
200-240-0008
Page 2-6
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.4.2.2
Dual KMA24H -71 Installation
In a dual KMA24H-71 installation, we recommend that the ISO/Normal/Private switches be removed.
These switches apply a ground to logic inside the KMA24H.
THE CONNECTIONS BETWEEN THE AUDIO PANELS MUST BE LEFT INTACT. This includes Pins
V to V (Key Enable), 21 to 24 (Isolate /Isolate 22) and Y to Y (Private). PS Engineering uses these lines
for data bus communications between panels.
2.4.3
Power
The PAC24-Series are compatible with both 14 and 28 Volt DC systems. A three (3) Amp breaker is required. Power and ground wires must be a twisted #18 AWG pair. Connect airframe power ground to J3
Pin 25 only. No dropping resistors are required.
2.4.4
Communications Push-to-Talk (single panel installation)
Unless the system is in split mode, only the person who presses their transmit PTT switch will be heard
over the radio. If the pilot and copilot both use the PTT, only the pilot position has access to the radio. The
pilot position will have PTT control regardless of the mic selector switch or copilot PTT when the PAC24
is in the OFF/EMG mode.
2.4.4.1
Communications Push-to-Talk (Dual Panel Installation)
The PAC24 automatically senses if the other audio panel is transmitting. If communications transceivers
selected for transmit are different (Com 1 pilot, Com 3 copilot), both panels will allow simultaneous, dual
transmission (split mode). If the same radio has been selected for transmit on both audio panels, the pilot
mic will have priority, and the copilot will not transmit.
2.4.5
Audio Panel interface
The PAC24 is designed to interface with standard aircraft avionics, and presents a 500Ω receiver impedance. For best results, a twisted-shielded cable is recommended from the avionics audio source to the audio
panel, with the shield grounded at the audio panel end.
Some avionics do not provide a separate audio low, and may introduce additional electrical noise into the
system. For best results, connect the audio low from the audio panel to the radio ground, using one conductor of the twisted-shielded cable.
2.4.6
Transmit Interlock
Some communications transceivers use a transmit-interlock system. To fully utilize the Split Mode feature,
this function must be disabled. Consult that manufacturer's installation manual.
2.4.7
"Swap" Mode
When a momentary, normally open, push-button switch is connected between pin U (14 V) or 18 (28V
lighting) on the unit connector and aircraft ground, the user can switch from Com 1 to 2 to 3 etc. by depressing this switch without having to turn the mic selector switch. This yoke-mounted switch eliminates
the need to remove your hands from the controls to change transceivers.
NOTE: Swap mode is active if the proper DIP switch selection is made internally to the unit.
2.4.8
Backlighting
The PAC24 has an automatic dimming of the pushbutton annunciator LEDs and marker lamps controlled
by a photocell. Control of the unit backlighting is through the aircraft avionics dimmer. Connect the dimmer control line to J3 pin 18 for 14-volt systems, and to J3 pin U for 28-volt systems. Pin 17 is light
ground.
If an external dimmer control is not used, a constant low-level back light illumination can be established
for nighttime viewing. Pin 18 or U (depending on system voltage) must be tied to power (J3, pin 25) for
200-240-0008
Page 2-7
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
the back lighting system to work. The photocell mounted in the unit face will automatically adjust the intensity of the push-button annunciator LEDs.
2.4.9
Unswitched inputs
J3, pin 10 is the unswitched input number 1 and J3 pin 14 is unswitched input 2. These inputs are presented
to the pilot and copilot regardless of the audio configuration, and will always mute the entertainment inputs. These 510Ω inputs can be used for altimeter DH audio, GPS waypoint audio, autopilot disconnect
tones, air-to-ground (Flitefone) telephone ringer or any other critical audio signal.
2.4.10 PA Mute (J3, Pin 8)
Pin 18 of J3 is a TTL logic output that is pulled low during PTT operation. This serves as an input to external public address system to prevent feedback during transmissions.
2.4.11 Public Address (J3, Pin B)
When the Speaker mode switch is in the PA mode, and the pilot’s PTT is activated, his voice is heard over
the PA speaker output on J3, Pin B. The copilot can continue to use the selected com.
NOTE: Connecting two audio panels to a single speaker for cockpit or cabin address can result in weak and distorted audio.
2.4.12 Intercom wiring
See Appendices for intercom connection configurations. It is critical to the proper operation of this system
to have this connector wiring made in accordance with these diagrams. Use 2- and 3-conductor, MIL-spec
cable as shown. Connect the shields at the audio panel end only, and tie to the audio low inputs as shown.
2.4.12.1 Push to talk intercom
The PAC24 can be used as an IntelliVox® intercom, or, as a keyed intercom. Switching J3 pin W to
ground will inhibit the IntelliVox® and the intercom squelch will not open until the ICS PTT switch is
activated.
The following pins are used to control the intercom when PTT ICS is desired. Pin 11 must be grounded
through a momentary switch for the pilot to talk on the intercom (with W also grounded). Pin M must be
grounded through a momentary switch for the copilot to talk on the intercom (with W also grounded).
2.4.13 Entertainment Input (J3 Pin 7)
If music or entertainment is desired, a monaural input can be applied to Pin 7 of J3.
N O T E : U s e t h e l o w l e v e l o u tp u t o f a n y e n te r ta in me n t d e v ic e to c o n n e c t to th e a u d io
p a n e l. Ma x imu m s ig n a l le v e l is 2 V A C p - p .
D O N O T u s e a s p e a k e r - l e v e l o u tp u t, t h i s w i l l c a u s e i n t e r n a l d a ma g e i n t h e a u d io
p a n e l.
PS Engineering offers an aviation Compact Disk player, the PCD7100 (Part Number 11952), designed to
interface with the audio panel.
All entertainment devices must be switched off for both takeoff and landing.
2.4.13.1 Entertainment distribution
The entertainment source provides music for all intercom copilot positions. In ISO, it is removed from the
pilot. The PAC24-system incorporates a "Soft Mute" system. This will mute the entertainment devices during ICS or radio conversation.
Any signal appearing in the unswitched audio inputs will always mute the entertainment sources, even
though the passengers may not hear the audio tone itself.
200-240-0008
Page 2-8
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Caution: Local oscillators and internal signals from some entertainment equipment can cause undesired
interference with other aircraft systems. Before takeoff, operate the entertainment devices to determine if
there is any adverse effect within the aircraft systems. If any unusual operation is noted in flight, immediately switch off the entertainment devices.
All entertainment devices must be switched off for both takeoff and landing.
2.4.13.2 Entertainment inhibit
The music input to the PAC24 uses the existing Speaker Power input from the KMA24-71. This pin should
be removed even if music is not desired. However, if avionics power remains on Pin 7, there is the
possibility of power ripple entering the system. The Music input can be deactivated from the front panel by
pressing the NAV 1 and AUX buttons for at least 3 seconds. The audio panel will then ignore any signal
on this input, until the Music Off mode is toggled again.
2.4.14 Intercom expansion (J3, Pins 22, 23 and a)
The PAC24 contains a five-place intercom (pilot, copilot and three passengers). In applications where more
intercom positions are needed, PS Engineering can provide intercom expansion units, such as the IntelliPAX, part number 11606, 11606R, etc. These can add up to six additional stereo intercom stations, plus
independent stereo music input. Interface to the expansion unit is through, pins 22 (audio input from expansion unit), 23 (audio output to expansion unit) and a (9 VDC expansion power).
These pins are shared with the microphone inputs; therefore the internal DIP switched must be correctly
configured (see above).
2.4.15 Playback button Installation (Pin 2- Option 1 units only)
To activate the Recording System playback, a momentary push button switch is required. This switch can
be located anywhere in cockpit convenient to the pilot's reach. The normally open switch must be connected to pin 2 of J3 of the PAC24, and ground. This pin is shared with the CVR output; therefore the internal DIP switched must be correctly configured (see above).
2.5
Adjustments
The PAC24 is factory adjusted to accommodate the typical requirements for most aircraft configurations.
There are two adjustments however, that will allow the installer to tailor the volume controls to suit specific functions.
PA Volume
Master Volume
Figure 2-1- PAC24 Adjustments
200-240-0008
Page 2-9
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.6
Communications Antenna Installation Notes
For best results while in Dual installations or Split Mode (two communicates transceivers active at the same time), we
recommend that the one VHF communications antenna is located on top of the aircraft while the other communications
antenna is installed on the bottom. Any antenna relocation must be accomplished in accordance with AC 43.13-2A,
aircraft manufacturers’ recommendations and FAA-approved technical data.
Warning:
Itisprobable that radio interference will occur in the split mode when the frequencies of the two aircraft radios are
adjacent, and/or the antennas are physically close together. PS Engineering makes no expressed or implied warranties regarding the suitability of the PAC24 in Dual or Split Mode.
2.7
Wireless telecommunications interface
The PAC24 has interface capability with units such as the AirCell Guardian. It is the user’s responsibility to determine
the appropriate legal use of the equipment, and provide the equipment and services.
As installed in the standard configuration, the PAC24 Com 5 function operates conventionally. Pushing the Com 5
Xmt button places the receive audio from Com 5 in the headset and applies the pilot or copilot microphone to the Com
5 when the appropriate PTT is activated.
If telephone mode is selected by the internal DIP switch the PAC24 is forced into Com 5-Duplex mode. This mode is
designed to operate with telecommunications systems, such as the AirCell AGM.01. Intercom Audio streams are provided to the COM 5 output, the PTT for Com 5 is inactive, and audio from Com 5 is presented to the headset. This
allows a telephone-like audio interface. The COM 5 input and output is compatible with aviation radios.
In a DUAL Audio Panel installation, the telephone mic audio input should be connected to the PILOT COM 5 Mic
output (J3 pin only).
PS Engineering makes no expressed or implied warranty that the equipment will be compatible with any devices other
than AirCell.
Unauthorized use of cellular telephone devices in aircraft is subject to FCC enforcement action,
which may include a $10,000 fine per incident. PS Engineering, Inc. does not endorse using unapproved cellular telephone equipment in flight, and takes no responsibility for the user’s action.
200-240-0008
Page 2-10
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.8
PAC24 Pin assignments
J3 Connector
Speaker Lo
Aircraft Ground
CVR Output
PA Speaker
Com 1 Mic Aud
Com 1 Mic Key
Cockpit Spkr Out
Pilot Headphones
Com 3 Mic Audio
Com 2 Mic Audio
Com 5 Mic Audio
Com 4 Mic Audio
Entertainment in
Com 2 Mic Key
PA Mute
Com 3 Mic Key
Com 4 Mic Key
Com 5 Mic Key
Unswitched Audio In #1
ADF Audio
Pilot ICS PTT
Copilot ICS PTT
Marker Audio
DME Audio
Nav 2 Audio
Nav 1 Audio
Unswitched Audio In #2
Com 5 Audio
Com 4 Audio
Com 3 Audio
Com 2 Audio
Com 1 Audio
Light Lo
28 V lights Hi
14 V Light Hi
SCL
Pilot Mic Key
ICS Key
Copilot Mic Audio Hi
Copilot Mic Key
PAX out ICS Cross Tie 2
SDA
Pass 3 Mic Audio Hi
Pass 1 Mic Audio Hi
Pass 4 Mic Audio Hi
Pass 5 Mic Audio Hi
PAX IN- ICS X tie 1
Copilot/Pass phones
11-33 Aircraft Power
Audio Low
200-240-0008
1
A
2
B
3
C
4
D
5
E
6
F
7
H
8
J
9
K
10
L
11
M
12
N
13
P
14
R
15
S
16
T
17
U
18
V
19
W
20
X
21
Y
22
Z
23
a
24
b
25
c
Page 2-11
Alternate Functions
(See Instructions)
Playback
14V Swap
28V Swap
Expansion In
Expansion Out
Expansion Power
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
2.9
Post Installation Checkout
After wiring is complete, verify power is ONLY on pin 25 of the J3 and airframe ground on bottom connector pin A. Failure to do so will cause serious internal damage and void PS Engineering's warranty.
2.10
Unit Installation
To install the PAC24, gently slide the unit into the mounting rack until the hold-down screw is engaged.
While applying gentle pressure to the face of the unit, tighten the 3/32" hex-head in the center of the unit
until it is secure. DO NOT OVER TIGHTEN.
W a r n i n g : D o n o t o v e r - t i g h te n t h e l o c k d o w n s c r e w w h i l e i n s t a l l i n g t h e u n i t i n t r a y .
Internal damage will result.
2.10.1 Operational Checkout
NOTE: The IntelliVox® is designed for ambient noise levels of 80 dB or above. Therefore some clipping
may occur in a quiet cabin, such as without the engine running, in a hangar. This is normal.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
Apply power to the aircraft and avionics.
Plug headsets into the pilot, copilot, and occupied passenger positions.
Verify fail-safe operation by receiving and transmitting on com 1 from the pilot position, with the audio panel power off.
Switch on the unit by pressing the volume (VOL) knob.
Check intercom operation.
Push the Com 1 Xmt select button (lower row).
Verify that both of the Com 1 buttons light. Verify that transmit button LED (Light Emitting Diode)
near the mic selector is not blinking. If the LED is blinking, stop testing and troubleshoot the microphone PTT installation.
Verify proper transmit and receive operation from the copilot position, noting that the copilot PTT
switch allows proper transmission on the selected transceiver. Verify that the Com 1 Xmt button blinks
when transmitting.
Verify that pushing the COM 2 button causes the button to illuminate, and the Com 2 receiver to be
heard. Verify operation on Com 1 from the pilot position.
Repeat for other transceivers and standard Com 5, (if installed).
Press and hold the Com 1 Xmt button. While holding the Com 1 button, press the Com 2 Xmt button.
This places the unit in “Split Mode;” Verify that the pilot can transmit and receive on Com 1, while the
copilot transmits and receives on Com 2.
If the audio panel is configured for duplex operation on Com 5 (SW4 Dip switch 4 selected “on”),
verify that the pilot headset is connected to the cellular telephone system (if installed). Verify that by
using the pilot side PTT, the pilot can transmit on the other selected radio (Com 1 or Com 2). Verify
that the Com 5 Xmt LED blinks at about twice the rate of com 1, to indicate a duplex mode. The copilot has radio transmit capability in Com 5 duplex mode, on the selected Com ( 1 or 2).
Verify proper operation of all receiver sources by selecting them using the appropriate button. The
button illuminates to show which source is in use.
Switch the SPR control to SPR. Verify that all selected audio is heard in the cockpit speaker. Verify
that the audio mutes when the mic is keyed.
Switch the SPR control to PA, an verify that the pilot mic is connected to the cabin or external
speaker, (if installed).
Verify that the appropriate LED in the lower right side blinks when either push to talk is keyed.
Verify proper Intercom system operation in the ALL, ISO and CREW modes (see Table 3-1).
200-240-0008
Page 2-12
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
18. Verify that the audio selector panel system does not adversely affect any other aircraft system by systematically switching the unit on and off, while monitoring the other avionics and electrical equipment
on the aircraft.
2.11 Internal Recorder Checkout (Optional units only)
With headset plugged into pilot’s side jacks, tune COM 1 to local frequency, such as FSS or ATC ground.
Select Com 1 on mic selector switch, and record at least five incoming radio transmissions.
This audio should only appear in the pilot’s headset, and only be incoming transmissions from the transceiver selected in the mic select switch.
Depress the panel or yoke mounted playback switch, and verify that messages play, in the order received.
Repeat for other installed transceivers.
2.12
Final Inspection
Verify that the wiring is bundled away from all controls and no part of the installation interferes with aircraft control operation. Move all controls through their full range while examining the installation to see
that no mechanical interference exists. Verify that the cables are secured to the aircraft structure in accordance with good practices, with adequate strain relief. Ensure that there are no kinks or sharp bends in the
cables and coaxial cables. Verify that the cables are not exposed to any sharp edges or rough surfaces, and
that all contact points are protected from abrasion.
Complete logbook entry, FAA Form 337, weight and balance computation and other documentation as
required. Sample text for FAA Form 337, and instructions for continuing airworthiness can be found in
Appendix F.
Return completed warranty registration application to PS Engineering.
200-240-0008
Page 2-13
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section III OPERATION
GENERAL INFORMATION
3.1
SCOPE
This section provides detailed operating instructions for the PS Engineering PAC24 High Performance
Audio Selector Panel/Intercom Systems. Please read it carefully before using the equipment so that you can
take full advantage of its capabilities.
This section is divided into three sections covering the basic operating areas of the PAC24 systems. They
are transceiver selection, audio selector, and intercom.
1
4
5
2
3
Figure 3-1 PAC24 front panel controls
3.2
PAC24 Controls
1) Receiver Source Selection
2) Transmitter Selection
3) Volume / Power Controls
4) Speaker Selector
5) Intercom Mode Selector
3.3
Power Switch (3) (EMG-Fail Safe Operation)
Unit power is turned on and off by pushing the center (pilot) volume knob. The power switch controls the
audio selector panel functions and intercom.
3.3.1
Single Panel Fail Safe Operation
In the OFF or "EMG" position, the pilot is connected directly to Com 1. This allows communication capability regardless of unit condition. Any time power is removed or turned OFF, the audio selector will be
placed in the fail-safe mode.
200-240-0008
Page 3-1
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
3.3.2
Dual Panel Fail Safe Operation
In a dual installation, the PAC24 designated as Pilot’s at installation, will default to Com 1. The audio
panel designated as copilot will not operate in the off position. This prevents compromising the pilot’s audio capability in the event of a dual audio panel problem.
3.4
Microphone Selector (2)
There are 10 pushbuttons associated with the communications transceivers. The lower buttons control
which transceiver is selected for transmit.
The PAC24 gives priority to the pilot’s PTT. If the copilot it transmitting, and the pilot presses his PTT, the
pilot’s microphone will be heard over the selected com transmitter.
The PAC24 has an automatic selector mode. Audio from the transceiver selected by the Xmit button is
automatically heard in the headsets and speaker (if selected). You can check this function by switching
from COM 1 to COM 2 and watch the selected audio light on the selector change from COM 1 to COM 2.
This ensures the pilot will always hear the audio from the transceiver he is transmitting on.
When switching from COM 1 to COM 2, while COM 2 audio had been selected, Com 1 audio will continue
to be heard. This eliminates the pilot having to switch Com 1 audio back on, if desired.
When switching from COM 1 to COM 2 while Com 2 has NOT been selected, Com 1 audio will be switched
off. In essence, switching the mic selector will not effect the selection of Com receiver audio. This is true
of all transmitter selections.
3.4.1
Telephone Operation
In a single installation, the intercom mode select switch determines who is on the phone:
ISO - pilot
CREW - pilot and copilot
ALL - pilot, copilot, passengers
In a standard dual installation, the pilot and copilot can select TEL mode independent of each other by
pressing their respective COM5 XMT button. The passengers are on the phone only when the pilot has
selected tel mode and his switch is in the ALL position. The copilot cannot put the passengers on the
phone, and the passengers can only get on the phone when the pilot is on the phone. In an observer dual
installation, the crew box works like a single installation.
The observer is treated like a passenger, so he would be on the phone line when COM5 XMT is selected
and the intercom switch is in ALL mode. The observer cannot select telephone mode independently.
3.4.2
Stuck Microphone Protection
The PAC24 has a function designed to prevent unintentional radio transmissions and blocked frequencies.
After 35 seconds of continuous PTT on any input, the PTT line is lifted, and will remain unkeyed until the
PTT input is recycled.
NOTE: Selecting the COM 5 –TEL– mode will disable pilot and copilot intercom, as the intercom circuit is
transferred to the telephone use. However, sidetone will be present.
3.4.3
Swap Mode (Remote transfer of com transceivers)
With a yoke mounted, normally open, momentary switch, the pilot can change from the current Com transceiver another by depressing this switch. Activating the swap switch will select the next transceiver, cycling from 1 to 2 to 3 etc.
3.4.4
Observer transmit selection (part number –0400 series).
If the installation uses a dual panel, observer configuration, the crew panel serves the pilot and copilot,
while the second audio panel serves the observer.
200-240-0008
Page 3-2
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
The pilot and copilot have access to all transceivers. The observer can access any radio but the crew will
have transmit priority. If the crew selects a radio for transmit that the observer has previously selected, all
parties can transmit, but the pilot, copilot, have priority over the observer (in that order).
The crew has priority on all radios. The observer can listen to all radios if desired.
3.5
Receive Audio Selector (1)
Receiver audio is selected through 9 momentary push-button, backlit switches.
Because the microphone pushbutton selector switch controls what transceiver is being heard, you will always hear the audio from the transceiver that is selected for transmit.
The users can identify which receivers are selected by noting which of the green switch LEDs are illuminated. Push buttons labeled Nav 1, Nav 2, MKR (Marker), and AUX (auxiliary), are momentary type
switches. When one of these buttons is pressed, it will place the audio in the headphone or speaker output,
and the LED will illuminate. Press the switch again and will remove that receiver from the audio.
If the aircraft is equipped with an ADF or DME, that audio is available through the AUX button.
3.5.1
Speaker Amplifier (4)
The 3-position "SPR" switch controls the distribution of the audio in the cockpit or external (public address) speakers. In the up “SPR” position all selected audio is presented to the cockpit speaker. Unswitched
audio, (autopilot disconnect, altimeter warning, etc.) will come through the speaker regardless of the
speaker button position.
In PA, the primary (pilot) microphone audio is routed to the PA or external speaker (J3 pin B) when the
PTT is active. The copilot mic input can continue to transmit on the selected radio.
3.5.2
Key “Click”
The PAC24 is equipped with a “click” function that provides an aural feedback to the user in addition to
the tactile button push. This sound can be enabled or disabled by simultaneously holding the COM 1 and
COM 2 buttons in for at least 5 seconds. Any person hearing the radios will also hear the key click.
Allow at least 20 seconds between turning the key click on and off.
3.6
Split Mode
The PAC24 has a flexible split mode, which allows one pilot to use one transceiver while the other can
communicate on another. There are differences in the Split Mode in a single, or a dual audio panel installation.
Note:
Due to the nature of VHF communications signals, and the size constraints in general aviation
aircraft, it is probable that there will be some bleed-over in the Split mode, particularly on adjacent
frequencies.
PS Engineering makes no warranty about the suitability of Split Mode in all aircraft conditions.
3.6.1
Split Mode, Single panel
The split mode can be activated at any time by pressing the desired combination of XMT buttons. For instance, to activate a Com 1/Com 2 split, press and hold the Com 1 button, and then press the Com 2 button
while holding the Com 1 button. This places the pilot on Com 1 and the Copilot on Com 2.
Split mode for Com 5, in normal (not TEL/Duplex) is possible.
Pilot on Com 2, with copilot on Com 3, Com 4 or Com 5, is also possible.
Note: Split Mode does not turn off other (Nav, ADF, etc.) selected audio to pilot. Copilot does not hear other selected
radios.
200-240-0008
Page 3-3
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
3.6.2
Split Mode, Dual Panel
In a dual panel installation, both pilots have access to any combination of transceivers. Because there is
cross communication, each PAC24 knows the other unit’s transmitter selection. The audio panel designated
as “Pilot’s” will have transmission priority over the panel designated as copilot’s, when both panels are
keyed for transmit on the same radio.
It is not necessary to activate the split mode by holding the buttons in a dual installation.
3.6.3
Split Mode, Observer Panel (-04XX)
In observer mode, split mode is selected on the crew panel in the same manner as a single panel (for example, press COM1 and COM2 for COM1/2 mode). The observer’s panel will split as in a conventional dual
panel installation.
3.7
Intercom Operation
3.7.1
IntelliVox® VOX-Squelch
No adjustment of the IntelliVox® squelch control is necessary. There is no field adjustment. Through individual signal processors, the ambient noise appearing in all six microphones is constantly being sampled.
Non-voice signals are blocked. When someone speaks, only their microphone circuit opens, placing their
voice on the intercom.
The system is designed to block continuous tones, therefore people humming or whistling in monotone
may be blocked after a few moments.
For consistent performance, any headset microphone must be placed within ¼-inch of your lips,
preferably against them. (ref: RTCA/DO-214, 1.3.1.1 (a)).
It is also a good idea to keep the microphone out of a direct wind path. Moving your head through
a vent air stream may cause the IntelliVox® to open momentarily. This is normal.
The IntelliVox® is designed to work with normal aircraft cabin noise levels (70 dB and above). It
loves airplane noise! Therefore, it may not recognize speech and clip syllables in a quiet cabin,
such as in the hangar, or without the engine running. This is normal.
For optimum microphone performance, PS Engineering recommends installation of a Microphone Muff
Kit from Oregon Aero (1-800-888-6910). This will not only optimize VOX performance, but will improve
the overall clarity of all your communications.
Table 3-1 Mic Muff ™ Part Numbers
Manufacturer
Bose
David Clark
Lightspeed
Model
Dynamic
Electret
M87 Dynamic
H10-30
H10-20, H10-40
H10-13.4
15K & 20K
Peltor
7003
7004
90010
90015
Pilot
11-20 & 11-90
90015
Sennheiser
Telex
200-240-0008
Mic Muff™ Part Number
90010
90015
90020
90010
90015
90015
90015
90015
Airman 750
AIR3000
Page 3-4
90015
90010
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
3.7.2
Volume Control (3)
The volume control is a concentric knob. The inner knob adjusts the loudness of the intercom for the pilot
(in single panel installation) and the outer knob controls copilot and passenger volume. It has no effect on
selected radio levels or music input levels.
In dual installation, the inner knob controls the main volume (the person connected to the audio panel) and
the outer knob controls the passengers.
3.7.3
Intercom Modes (5)
The lower switch on the left side of the audio panel is a 3-position mode switch that allows the crew to
tailor the intercom function to best meet the current cockpit situation.
3.7.3.1
Single Installation Intercom Modes
ISO: (Up Position): The pilot connected to the PAC24 is isolated from the intercom and is connected only
to the aircraft radio system. He will hear the selected aircraft radio reception (and sidetone during radio
transmissions). The copilot will hear passengers’ intercom and entertainment, while passengers will hear
copilot, intercom and entertainment.
ALL: (Middle Position): All parties will hear the aircraft radio and intercom. All will hear entertainment.
During any radio or intercom communications, the music volume automatically decreases. The music volume increases gradually back to the original level after communications have been completed.
CREW (Down Position): Pilot copilot and passengers are connected on one intercom channel and have access to the selected aircraft radios. They may also listen to Entertainment.
3.7.3.2
Dual Installation Intercom Modes
ISO: (Up Position): The primary pilot connected to the PAC24 is isolated from the intercom and is connected only to the aircraft radio system. He will hear the selected aircraft radio reception (and sidetone during radio transmissions). The crewmember on the other audio panel will hear locally selected radio audio,
passengers’ intercom and entertainment, while passengers will hear the radio, intercom and entertainment.
ALL: (Middle Position): All parties will hear the aircraft radio and intercom. All will hear entertainment.
During any radio or intercom communications, the music volume automatically decreases. The music volume increases gradually back to the original level after communications have been completed.
CREW (Down Position): Pilot and copilot are connected on one intercom channel and have exclusive access to the locally selected aircraft radios. They may also listen to Entertainment. Passengers can continue
to communicate with themselves without interrupting the Crew and also may listen to Entertainment.
3.7.3.3
Observer Installation ISO Modes
If the observer’s panel is placed ISO, only the observer is isolated. CREW and ALL settings make no difference on the observer panel.
3.7.4
Entertainment Input
The audio selector panel has provisions for one entertainment input device in each audio panel. The volume control does not affect music level.
Anytime a person speaks on the intercom, or there is radio traffic, the music will be muted. It will return
gradually, through the use of SoftMute™ circuitry.
The SoftMute™ can be defeated for a “Karaoke Mode” (music does not mute) by pressing the NAV1 and
NAV2 buttons simultaneously for at least 3 seconds. Pressing the buttons again will reactivate SoftMute™.
While in the ISO (Isolate) mode, the non-isolated crewmember and passengers will hear entertainment.
When in the ALL mode, all persons will hear the entertainment source.
200-240-0008
Page 3-5
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
3.7.4.1
Music Off
Music Off mode may be selected in cases where a music input is not connected, or in use, but audio noise
can be heard due to other loads or cross-talk in the system.
Music can be inhibited completely by pressing NAV1 and AUX for at least 3 seconds. Music Off
will override karaoke mode
3.8
Telephone Mode
The Com 5 mode can serve as a full duplex interface for telephone systems if the installation is correctly
configured. When interfaced with an approved airborne telecommunications system, the PAC24 can serve
as an audio control and distribution center. The crewmember’s telephone access is the "Com 5" button on
the audio panel. When Com 5 is active in the duplex mode, the TX button will blink about twice as fast as
the normal transmit rate.
In a single installation, the intercom mode select switch determines who is on the phone:
ISO - pilot
CREW - pilot and copilot
ALL - pilot, copilot, passengers
In a standard dual installation, the pilot and copilot can select TEL (Com 5) mode independently by pressing their respective COM5 Xmt button. The passengers are on the phone only when the pilot has selected
Com 5 mode and his ICS mode switch is in the ALL position.
The copilot cannot put the passengers on the phone, and the passengers can only get on the phone when the
pilot is on the phone.
In an observer dual installation, the crew box works like a single installation. The observer is treated like a
passenger, so he would be on the phone line when COM5 Xmt is selected and the intercom switch is in
ALL mode. The observer cannot select telephone mode independently. The observer is on the phone if the
crew system is in ALL and the observer is not in ISO.
Note: Because the cellphone uses an intercom circuit, all stations on that circuit will lose
intercom capability when the cellphone is in use.
3.9
Internal Recorder System (Option 1 Units Only)
The Intercom Recording System (referred to here as the IRS) is a digital recording system allowing automatic storage and playback of aircraft radio traffic.
Operating as a continuous loop recorder, (first message received will be the last heard), the recorder has
one minute of recording time or up to 16 messages. With its own built in VOX circuit, there are no buttons
to press to start recording. The system automatically begins to record the instant the radio becomes active.
Only aircraft radio audio in pilot’s headset is recorded and only the pilot will hear the playback audio.
3.9.1
Operation
Recording is automatic; there is no action required by the pilot. To play back the last recorded message,
simply press the momentary switch associated with the IRS. Each additional press of the button will play
the preceding recorded message. You must wait for the message to finish playing before accessing the
prior message.
To cancel the playback, press and hold the playback button for two seconds. The next time the button is
pressed, the next earlier message will be heard.
3.9.2
Concurrent Messages
When a recorded message is playing, the recording is momentarily inhibited. For instance, if an IRS message is being played, recorder will not begin until the IRS message is finished.
200-240-0008
Page 3-6
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-240-0008
Page 3-7
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Section IV- Warranty and Service
4.1
Warranty
In order for the factory warranty to be valid, the installations in a certified aircraft must be accomplished by
an FAA- (or other ICAO agency) certified avionics shop and authorized PS Engineering dealer. If the unit
is being installed by a non-certified individual in an experimental aircraft, a factory-made intercom harness
must be used for the warranty to be valid.
PS Engineering, Inc. warrants this product to be free from defect in material and workmanship for a period
of three (3) years from the date of installation as recorded in aircraft logbook and/or on FAA Form 337.
During the first twelve (12) months of the three-year warranty period, PS Engineering, Inc., at its option,
will send a replacement unit at our expense if the unit should be determined to be defective after consultation with a factory technician. For the remaining twenty-four (24) months of the three-year warranty period, the unit must be returned to PS Engineering, Inc., or an authorized warranty service facility, for nocost repair.
All transportation charges for returning the defective units are the responsibility of the purchaser. All domestic transportation charges for returning the exchange or repaired unit to the purchaser will be borne by
PS Engineering, Inc. The risk of loss or damage to the product is borne by the party making the shipment,
unless the purchaser requests a specific method of shipment. In this case, the purchaser assumes the risk of
loss.
This warranty is not transferable. Any implied warranties expire at the expiration date of this warranty. PS
Engineering SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. This
warranty does not cover a defect that has resulted from improper handling, storage or preservation, or unreasonable use or maintenance as determined by us. This warranty is void if there is any attempt to dissemble this product without factory authorization. This warranty gives you specific legal rights, and you may
also have other rights, which may vary from state to state. Some states do not allow the exclusion of limitation of incidental or consequential damages, so the above limitation or exclusions may not apply to you.
All items repaired or replaced under this warranty are warranted for the remainder of the original warranty
period. PS Engineering, Inc. reserves the rights to make modifications or improvements to the product
without obligation to perform like modifications or improvements to previously manufactured products.
4.2
Factory Service
The unit is covered by a three-year limited warranty. See warranty information. Call PS Engineering, Inc.
at (865) 988-9800 before you return the unit. This will allow the service technician to provide any other
suggestions for identifying the problem and recommend possible solutions.
After discussing the problem with the technician and you obtain a Return Authorization Number, ship
product to:
PS Engineering, Inc.
Attn: Service Department
9800 Martel Rd
Lenoir City, TN 37772
(865) 988-9800 FAX (865) 988-6619
Email: support@ps-engineering.com
Units that arrive without an RMA number, or telephone number for a contact will be returned rejected. PS
Engineering is not responsible for items sent via US Mail.
200-240-0008
4-1
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Appendix A – Installation Drawing
C
L OF THE UNIT
6.165
(INSIDE)
6.298
(OUTSIDE)
6.485
Key between 17 and 18
25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
1.248 (INSIDE)
1.312(OUTSIDE)
J1
c b a Z Y XW V U T S R P N M L K J H F E D C B A
Rear Connector (Viewed from front)
0.320
5.570
6.450
6.690
200-240-0008
Appendix A
Rev. 8, June 2003
200-240-0008
15
Com 4 Audio Hi
P
13
12
L
N
Nav 1 Audio Hi
NAV 1 Audio Lo
Nav 2 Audio Hi
Nav 2 Audio Lo
Mkr Audio In Hi
Mkr Audio In Lo
ADF Audio Hi
ADF Audio Lo
DME Audio Hi
DME Audio Lo
VHF Nav 1
VHF Nav 2
Mkr Receiver
ADF Receiver
DME Receiver
Appendix A
11-33 VDC
3A
See Note 11
Airframe Ground
14 V Lights Hi/28V Swap
Lights Lo
28 Volt Lights Hi/14V swap
23
Expansion Output
See Note 7
22
Expansion Input
Speaker Hi
Pass. 3 Mic Jack
Pass. 2 Mic Jack
Pass. 1 Mic Jack
Copilot PhonesJack
Copilot ICS PTT
Pilot ICS PTT
ICS PTT Enable
11
W
SCL (No Connect)
ICS Tie (No Connect)
ICS Tie (No Connect)
SDA (No Connect)
See Note 12
See Note 7
Copilot PTT
See Note 4
Pilot PTT
See Note 6
Playback/ CVR
Ent. Audio Lo
Ent. Audio
Ext Speaker Hi
Ext Speaker Lo
Speaker Lo
M
V
21
24
Y
A
2
25
See Note 7
PA Mute Trigger
8
Pass. Mic Lo
Pass. Mic Hi
Pass. Mic Lo
Pass. Mic Hi
Pass. Mic Lo
Pass. Mic Hi
Copilot Phones Lo
Copilot Phones
Copilot Mic PTT
Copilot Mic Lo
Pilot Phones
Pilot Phones Lo
Copilot Mic Audio Hi
Pilot Mic PTT
Pilot Mic Lo
Pilot Mic Audio Hi
1. All wiring must conform to MIL 22750 or 27500.
2. All shields should be grounded at audio panel only,
other end remains floating.
3. All phone and mic jacks must be floating from ground.
4. Speaker low must be connected as shown,
and not to other audio low.
5. To have 3 passengers in addition to copilot, connect to jacks.
OR : For expansion unit, use part number 11606 or 11606R only.
6. Pins V, Y, 21 and 24 are not used in single systems.
7. Pins M, W, and 11 are use in cases where a
Push-to-talk intercom is desired.
8. PA Mute is TTL Level logic low when transmit PTT is active.
9. For music distribution information, see Section 4.13
10. All wiring must be #24 AWG or larger, unless otherwise noted.
11. Power and Ground to be #18 AWG or larger.
For best results, power and ground wires should be twisted
together for greater noise immunity.
12. See Section 2.3.2 for details on pins selected through DIP.
U
17
18
c
7
a
b
20
X
B
4
1
D
Expansion power out
See Notes 5 & 12
14
Unswitched Input #2 Hi
Unswitched Audio Lo
Unswitched Audio #2
Z
19
10
Unswitched Input #1 Hi
Unswitched Audio Lo
Com 5 Mic Key
Com 5 Lo
Com 5 Audio Hi
Unswitched Audio #1
See Notes 1 & 2
6
K
Com 5 Mic Audio Hi
Communications
Transceiver #5
Com 4 Mic Key
F
9
R
Com 4 Lo
Com 3 Mic Key
5
J
S
E
H
16
3
C
T
Com 3 Mic Audio Hi
Com 3 Lo
Com 3 Audio Hi
Com 2 Mic Key
Com 2 Mic Audio Hi
Com 2 Lo
Com 2 Audio Hi
Com 1 Mic Key
Com 1 Mic Audio Hi
Com 1 Lo
Com 1 Audio Hi
Com 4 Mic Audio Hi
Communications
Transceiver #4
Communications
Transceiver #3
Communications
Transceiver #2
Communications
Transceiver #1
Pass. 4 Phones Jack
Pass. 3 Phones Jack
See Note 3
Pass. 2 Phones Jack
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Appendix B Single Interconnect Wiring
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Appendix B Dual Interconnect wiring
Com #1
Com #4
Com #5
(Note 13)
NAV
1
NAV
2
MKR
ADF
DME
UNSW
1
UNSW
2
Com 1 Audio Hi
Com 1 Lo
Com 1 Lo
3
C
Com 1 Mic Audio Hi
Com 1 Mic Key
Com 1 Mic Audio Hi
Com 1 Mic Key
3
C
16
Com 2 Audio Hi
Com 2 Audio Hi
16
Com 2 Lo
Com 2 Lo
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 3 Audio Hi
Com 3 Audio Hi
5
J
15
F
9
R
Com 1 Audio Hi
Com 3 Lo
Com 3 Lo
Com 3 Mic Audio Hi
Com 3 Mic Audio Hi
Com 3 Mic Key
Com 3 Mic Key
Com 4 Audio Hi
Com 4 Audio Hi
Com 4 Lo
Com 4 Mic Audio Hi
Com 4 Lo
Com 4 Mic Audio Hi
Com 4 Mic Key
Com 4 Mic Key
Com 5 Audio Hi
Com 5 Audio Hi
Com 5 Lo
Com 5 Lo
6
K
Com 5 Mic Audio Hi
Com 5 Mic Audio Hi
Com 5 Mic Key
Com 5 Mic Key
Pilot Mic PTT
Pilot Mic Lo
Pilot Phones
E
H
S
5
J
15
F
9
R
6
K
P
Nav 1 Audio Hi
NAV 1 Audio Lo
Nav 1 Audio Hi
NAV 1 Audio Lo
Nav 2 Audio Hi
Nav 2 Audio Lo
Nav 2 Audio Hi
Nav 2 Audio Lo
13
12
Mkr Audio In Hi
Mkr Audio In Lo
Mkr Audio In Hi
Mkr Audio In Lo
12
L
ADF Audio Hi
ADF Audio Lo
ADF Audio Hi
ADF Audio Lo
L
DME Audio Hi
DME Audio Lo
DME Audio Hi
DME Audio Lo
P
1. All wiring must conform to MIL 22750 or 27500.
2. All shields should be grounded at audio panel only,
other end remains floating.
3. All phone and mic jacks must be floating from ground.
4. Speaker low must be connected as shown,
and not to other audio low.
5. To have 3 passengers in addition to copilot, connect to jacks.
OR : For expansion unit, use part number 11606 or 11606R only.
6. Pins V, Y, 21 and 24 are used to connect in dual systems.
7. Pins M, W, and 11 are use in cases where a
Push-to-talk intercom is desired. (Section 2.4.12.1)
8. PA Mute is TTL Level logic low when transmit PTT is active.
9. For music distribution information, see Section 2.4.13
10 All wiring must be #24 AWG or larger, unless otherwise noted.
11. Power and Ground to be #18 AWG or larger.
For best results, power and ground wires should be twisted
together for greater noise immunity.
12. See Section 2.3.2 for details on dual mode pins selected through DIP.
13. In TEL mode, COM 5 Mic audio should ONLY be connected to pilot's audio panel
Copilot audio will be routed through pilots panel to phone.
In duplex mode, radio PTT connection is not necessary if not supported by
the telephone.
N
10
Unswitched Input #1 Hi
Unswitched Audio Lo
Unswitched Input #1 Hi
Unswitched Audio Lo
10
14
Unswitched Input #2 Hi
Unswitched Audio Lo
Unswitched Input #2 Hi
Unswitched Audio Lo
14
2
Pilot Mic Audio Hi
T
13
N
Pilot PTT
Com #3
T
E
H
S
Playback/ CVR (Note 12)
Com #2
2
Z
19
20
X
D
D
Pilot Phones Lo
Playback (Note 12)
Playback
Copilot Phones
Copilot Phones Lo
Cockpit Speaker Hi
4
1
4
1
Speaker Lo
Cockpit Speaker Hi
Speaker Lo
Speaker Lo
B
External Speaker Hi
20
X
Pass 1 Mic Hi
Z
19
22
Expansion Input
23
Expansion Output
Copilot Mic Audio Hi
Expansion Input
22
Expansion Output
23
Pass 2 Mic Hi
a
Pass 3 Mic Hi
Pass 1 Mic Hi
Pass 1 Mic Lo
Pass 2 Mic Hi
Pass 2 Mic Lo
Pass 2 Mic Lo
a
Pass 3 Mic Hi
Expansion Power Out
Expansion Power Out
Pass 3 Mic Lo
Pass 3 Mic Lo
V
SCL
SDA
V
Y
24
Pass ICS in
21
21
Pass ICS out
24
Y
b
Pass Phones
b
Pass Phones
Pass Phones Lo
Pass Phones Lo
Music In
7
Audio Low
8
25
2A
18
14 V dimmer/Swap (Note 12)
18
Audio Low
28 V dimmer/Swap (Note 12)
U
PA Mute (Note 8)
M
Pilot ICS key (Note 7)
Airframe Ground
W
ICS key enable (Note 7)
11
PA Mute (Note 8)
14V Dimmer/Swap
Swap
c
25
8
ICS key enable (Note 7)
200-240-0008
Note 9
Music Low
c
Swap
Switch
Music In
7
Music Low
11-33 VDC
Note 5
Note 5
Pass 1 Mic Lo
Note 9
Copilot PTT
Copilot Mic PTT
Copilot Mic Lo
2A
11-33 VDC
U
28 V dimmer/Swap (Note 12)
11
Copilot ICS key (Note 7 )
W
M
Airframe Ground
A
A
Appendix A
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
7.1
Dual PAC24 wiring with Observer Configuration Units
Com #1
T
3
C
Pilot ICS key
Pilot PTT
Com #2
Com #3
Com #4
Com #5
NAV
1
NAV
2
MKR
ADF
DME
Com 1 Audio Hi
Com 1 Audio Hi
Com 1 Lo
Com 1 Mic Audio Hi
Com 1 Mic Key
Com 1 Mic Audio Hi
Com 1 Mic Key
3
C
Com 2 Audio Hi
16
Com 2 Audio Hi
Com 2 Lo
Com 2 Lo
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 3 Audio Hi
Com 3 Audio Hi
Com 3 Lo
Com 3 Lo
5
J
15
Com 3 Mic Audio Hi
Com 3 Mic Audio Hi
Com 3 Mic Key
Com 3 Mic Key
Com 4 Audio Hi
Com 4 Audio Hi
Com 4 Lo
Com 4 Lo
F
9
R
Com 4 Mic Audio Hi
Com 4 Mic Audio Hi
Com 4 Mic Key
Com 4 Mic Key
Com 5 Audio Hi
Com 5 Audio Hi
Com 5 Lo
Com 5 Lo
6
K
Com 5 Mic Audio Hi
Com 5 Mic Audio Hi
Com 5 Mic Key
Com 5 Mic Key
P
Nav 1 Audio Hi
NAV 1 Audio Lo
Nav 1 Audio Hi
NAV 1 Audio Lo
5
J
15
F
9
R
6
K
P
Nav 2 Audio Hi
Nav 2 Audio Lo
Nav 2 Audio Hi
Nav 2 Audio Lo
13
12
Mkr Audio In Hi
Mkr Audio In Lo
Mkr Audio In Hi
Mkr Audio In Lo
12
L
ADF Audio Hi
ADF Audio Lo
ADF Audio Hi
ADF Audio Lo
L
N
DME Audio Hi
DME Audio Lo
DME Audio Hi
DME Audio Lo
N
10
Unswitched Input #1 Hi
Unswitched Audio Lo
Unswitched Input #1 Hi
Unswitched Audio Lo
10
14
Unswitched Input #2 Hi
Unswitched Audio Lo
Unswitched Input #2 Hi
Unswitched Audio Lo
14
11
D
Z
19
Observer Mic Audio Hi
Observer Mic PTT
Observer Mic Lo
D
Pilot Phones Lo
Cockpit Speaker Hi
Speaker Lo
4
1
Speaker Lo
External Speaker Hi
B
Pass Mic Hi
E
H
S
13
Pilot Phones
Copilot PTT
T
Com 1 Lo
E
H
S
Z
19
Copilot Mic PTT
UNSW
2
16
Pilot Mic Audio Hi
Pilot Mic PTT
Pilot Mic Lo
Copilot Mic Audio Hi
UNSW
1
Observer Phones
Observer Phones Lo
4
1
20
X
Local Speaker Hi
Speaker Lo
Speaker Lo
B
23
Pilot-Copilot
22
22
Observer
23
a
PA Speaker Hi
a
Pax Mic Hi
Pass Mic Lo
Copilot Phones Hi
Pass Mic Lo
V
Y
21
24
b
V
Y
24
21
SCL
SDA
Pass ICS in
Pass ICS out
b
Pax Phones
Copilot Phones Lo
Music In
Pass Audio Lo
7
Notes:
Music Low
c
11-33 VDC
2A
14 V dimmer/Swap (Note 2)
Swap
Switch
28 V dimmer/Swap (Note 2)
Backlight Lo
PA Mute (Note 3)
Airframe Ground
Playback/ CVR
200-240-0008
25
18
Audio Low
1. When using Passenger intercom, connect passenger 1 mic to pin (a) of cockpit box and
passenger 2 mic to pin (a) of observer box. Both passenger headsets must be tied to
pin (b) of observer box.
2. For 14V aircraft, connect 18 to dimmer, and use u as the swap input.
For 28 V aircraft, connect u to dimmer, and use 18 as swap input.
Internal DIP switches must be set correctly.
3. PA Mute is a TTL logic output
4. Pin 2 is dual use. Connect to CVR or use IRS playback if DIP switch correcltly set.
U
17
7
c
A
A
U
17
8
2
2
Appendix A
Audio Low
25
18
8
Music In
Music Low
2A
11-33 VDC
Airframe Ground
14 V dimmer/Swap (Note 2)
28 V dimmer/Swap (Note 2)
Backlight Lo
Swap
Switch
PA Mute (Note 3)
Playback
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
7.2
Dual PAC24 wiring with Observer Configuration and expansion units
Com #1
Com #2
Com #3
Com #4
Com #5
NOTE 13
NAV
1
NAV
2
MKR
ADF
DME
UNSW
1
UNSW
2
PAC24 Observer Unit
PAC24 Cockpit Unit
T
Com 1 Audio Hi
3
C
Com 1 Mic Audio Hi
Com 1 Mic Key
Com 1 Audio Hi
Pilot PTT
Com 1 Mic Audio Hi
Com 1 Mic Key
3
C
Com 2 Audio Hi
16
16
Com 2 Audio Hi
E
H
S
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 2 Mic Audio Hi
Com 2 Mic Key
Com 3 Audio Hi
Com 3 Audio Hi
Com 3 Lo
Com 3 Lo
5
J
15
Com 3 Mic Audio Hi
Com 3 Mic Audio Hi
Com 3 Mic Key
Com 3 Mic Key
Com 4 Audio Hi
Com 4 Audio Hi
Com 4 Lo
Com 4 Lo
F
9
R
Com 4 Mic Audio Hi
Com 4 Mic Audio Hi
Com 4 Mic Key
Com 4 Mic Key
Com 5 Audio Hi
Com 5 Audio Hi
Com 5 Lo
Com 5 Lo
6
K
Com 5 Mic Audio Hi
Com 5 Mic Audio Hi
Com 5 Mic Key
Com 5 Mic Key
P
Nav 1 Audio Hi
NAV 1 Audio Lo
Nav 1 Audio Hi
NAV 1 Audio Lo
P
13
Nav 2 Audio Hi
Nav 2 Audio Lo
Nav 2 Audio Hi
Nav 2 Audio Lo
13
12
Mkr Audio In Hi
Mkr Audio In Lo
Mkr Audio In Hi
Mkr Audio In Lo
12
L
ADF Audio Hi
ADF Audio Lo
ADF Audio Hi
ADF Audio Lo
L
DME Audio Hi
DME Audio Lo
Com 2 Lo
Com 2 Lo
Playback/ CVR (Note 14)
T
Com 1 Lo
Com 1 Lo
E
H
S
5
J
15
F
9
R
6
K
N
DME Audio Hi
DME Audio Lo
10
Unswitched Input #1 Hi
Unswitched Audio Lo
Unswitched Input #1 Hi
Unswitched Audio Lo
10
14
Unswitched Input #2 Hi
Unswitched Audio Lo
Unswitched Input #2 Hi
Unswitched Audio Lo
14
N
2
2
Pilot Mic Audio Hi
Pilot Mic PTT
Pilot Mic Lo
Z
19
Z
19
Pilot Phones
D
4
1
Speaker Lo
External Speaker Hi
B
Copilot Mic PTT
Copilot PTT
Pass Mic Hi
Observer Mic Audio Hi
Observer Mic PTT
Observer Mic Lo
Observer Phones
Observer Phones Lo
4
1
20
X
Local Speaker Hi
Speaker Lo
Speaker Lo
B
23
Pilot-Copilot
22
22
Observer
23
a
NOTE 18
PA Speaker Hi
IntelliPAX Expansion Unit
PN 11606
See Observer - 11606 wiring
diagram for more information
a
Pass Mic Lo
V
Y
24
Copilot Phones Hi
Playback (Note 14)
D
Pilot Phones Lo
Cockpit Speaker Hi
Speaker Lo
Copilot Mic Audio Hi
1. All wiring must conform to MIL 22750 or 27500.
2. All shields should be grounded at audio panel only,
other end remains floating.
3. All phone and mic jacks must be floating from ground.
4. Speaker low must be connected as shown,
and not to other audio low.
5. To have 3 passengers in addition to copilot, connect to jacks.
OR : For expansion unit, use part number 11606 or 11606R only.
6. Pins V, Y, 21 and 24 are used to connect in dual systems.
7. Pins M, W, and 11 are use in cases where a
Push-to-talk intercom is desired. (Section 2.4.12.1)
8. PA Mute is TTL Level logic low when transmit PTT is active.
9. For music distribution information, see Section 2.4.13
10 All wiring must be #24 AWG or larger, unless otherwise noted.
11. Power and Ground to be #18 AWG or larger.
For best results, power and ground wires should be twisted
together for greater noise immunity.
12. See Section 2.3.2 for details on dual mode pins selected through DIP.
13. In TEL Mode, COM 5 Mic audio should be connected to main audio panel ONLY
Observer audio will be routed through pilots panel to phone.
Leave PTT open to COM 5 if not required for duplex operation.
14. Pin 2 is dual use. Connect to CVR or use IRS playback if DIP switch set correctly.
15. For passenger intercom using PAC24, connect 22, 23,and a to passenger mics.
To use expansion unit (p/n 11606), connect 23, 23, and a as shown in the expansion
installation manual.
16. For 14V aircraft, connect 18 to dimmer, and use u as the swap input.
For 28 V aircraft, connect u to dimmer, and use 18 as swap input.
Internal DIP switches must be set correctly.
17. PA Mute is a TTL logic output
18. The passenger and cross tie interface
IS NOT IDENTICAL to a standard dual installation.
SDA
V
Y
Pass ICS in
24
SCL
b
b
Copilot Phones Lo
Music In
7
+9V DC Expansion Power
1
Expansion Output
3
Expansion Input
22
Expansion Ground
14
7
Music In
Music Low
Music Low
c
11-33 VDC
2A
14 V dimmer/Swap (Note 12)
Swap
Switch
28 V dimmer/Swap (Note 12)
Backlight Lo
PA Mute (Note 8)
c
Audio Low
25
Audio Low
25
2A
18
18
U
17
28 V dimmer/Swap (Note 12)
U
8
Backlight Low
17
ICS Key Enable
W
W
11
Pilot ICS key
Copilot ICS key
Airframe Ground
200-240-0008
ICS key enable
11
M
A
A
Appendix A
Swap
Switch
PA Mute (Note 17)
8
Note 7
11-33 VDC
14 V dimmer/Swap (Note 12)
Note 7
Observer ICS key
Airframe Ground
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Appendix C- Instructions for FAA Form 337 and continuing
airworthiness
8.1
Instructions for FAA Form 337, Audio Panels
One method of airworthiness approval is through an FAA Form 337, Major Repair and Alteration (Airframe, Powerplant, Propeller, or Appliance) In the case of the PAC24, you may use the following text as a guide.
Installed audio selector and 6-place intercom, PS Engineering PAC24, part number 7000 (X) in ( location )
at station
. Installed per AC43.13-2, Chapter 2, paragraph 23 (Instrument Panel Mounting). Installed
per PS Engineering Installation Operators Manual p/n 200-070-(XXXX), revision (), dated ( ).
This unit is FAA-Approved under TSO C50c for audio amplifiers, and meets appropriate environmental
qualifications outlined in RTCA DO-160D as appropriate or this aircraft.
Interface to existing aircraft radios in accordance with installation manual and in compliance with practices
listed in AC43.13-2, Chapter 2. All wires are Mil-Spec 22759 or 27500. Connection to aircraft dimmer bus is
____________________. Power is supplied to the unit through a 3A circuit breaker (type and part number),
and total electrical load does not exceed
% of the electrical system capacity with the PAC24 added.
Aircraft equipment list, weights and balance amended. Compass compensation checked. A copy of the operation instructions, contained in PS Engineering document 200-240-( ), revision ( ), dated ( ), is placed in the
aircraft records. All work accomplished listed on Work Order
.
8.2
Instructions for Continuing Airworthiness, Audio Panels
Sample ICA Checklist for PS Engineering Audio Panels:
Section
1
Introduction
Item
2
Description
3
4
5
6
Controls
Servicing
Maintenance Instructions
Troubleshooting
7
Removal and replacement information
8
9
10
11
12
13
14
15
16
Diagrams
Special Inspection Requirements
Protective Treatments
Structural Data
Special Tools
Not Applicable
Recommended Overhaul Periods
Airworthiness Limitations
Revision
200-240-0008
Information
Installation of audio control panel with integrated marker beacon receiver and
intercommunications system.
Installation as described in manufacturer’s installation manual referenced on
FAA Form 337, including interface with other avionics audio as required.
See installation and operator’s guide referenced on FAA Form 337.
None Required
On Condition, no special instructions
In the event of a unit problem, place the unit into “off,” “fail-safe” and/or
“emergency” mode. This allows pilot communications using COM 1. Follow
checkout instructions in the installation manual referenced on the FAA Form
337. For a specific unit fault, contact the manufacturer at (865) 988-9800 for
special instructions.
Removal: Using a 3/32” Allen-head wrench, carefully unscrew the locking
screw located in the center of the unit. While turning the wrench CCW, gently
pull on the EDGES of the bezel until the unit is free from the mounting tray.
Installation: Engage the locking screw at the back. Turn the locking screw CW,
while applying slight pressure to the edges of the bezel. Do not over tighten!
Not applicable
Not Applicable
Not Applicable
Not Applicable
None
Not Applicable
None
Not Applicable
To be determined by installer
Appendix C
Rev. 8, June 2003
PS Engineering
PAC24 Series Audio Selector Panel and Intercom System
Installation and Operator’s Manual
Appendix D – RTCA DO160D (EUROCAE ED-14) Environmental
Qualification Form
Audio Selector Panel/Intercom
Part Number: 050-240-0XXX
FAA TSO Number: C50c, Class A,
Manufacturer: PS Engineering Incorporated 9800 Martel Road
Lenoir City TN 37772
Conditions
Temperature and Altitude
Low Temperature
High Temperature
In-flight Loss of Cooling
Altitude
Decompression
Overpressure
Section
4.0
4.5.1
4.5.2
4.5.4
4.6.1
4.6.2
4.6.3
Conducted Tests
Equipment tested to CAT B1
-55° C Survival, -20°C Low Operating (B1)
+85°C Survival, +70°C High Short Time Operating
Not Applicable, no cooling required
25,000’ unpressurized (B1)
Not Applicable
Not Applicable
Temperature variation
Humidity
Operational Shock and Crash
Safety
Vibration
Explosion
Waterproofness
Fluids Susceptibility
Sand and Dust
Fungus
Salt Spray
Magnetic Effect
Power input
Voltage Spike
Audio Frequency Susceptibility
Induced Frequency Susceptibility
Radio Frequency Susceptibility
Radio Frequency Emission
Lightning Induced Transient
Susceptibility
Lightning Direct Effects
Icing
Electrostatic Discharge
5.2
6.0
7.0
Equipment tested to Category C
Equipment tested to Category A
Equipment tested Category B
200-240-0008
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
Equipment tested to Category G & M
Category X, not tested
Category X, not tested
Category X, not tested
Category X, not tested
Category X, not tested
Category X, not tested
Equipment tested to Category Z
Equipment tested to Category B
Equipment tested to Category B
Equipment tested to Category B
Equipment tested to Category A
Equipment tested to Category T
Equipment tested to Category M
Equipment tested to Category XXE2
23.0
24.0
25.0
Category X, not tested
Category X, not tested
Category X, not tested
Appendix D
Rev. 8, June 2003