Nat AA21-400 Installation And Operation Manual

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AA21-400

Cabin PA System

SM34

INSTALLATION AND OPERATION MANUAL

REV. 4.00 November 10, 2003

Northern Airborne Technology Ltd.

1925 Kirschner Road

Kelowna BC, Canada

V1Y 4N7

Telephone (250) 763-2232

Facsimile (250) 762-3374

Copyright 2003 by Northern Airborne Technology

CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.

The document reference is online, please check the correspondence between the online documentation and the printed version.

SM34 Rev. 4.00 AA21-400 Cabin PA System Manual

Periodically NAT will release manual amendments. In order to maintain the most accurate and up to date manual these amendments should be carried out immediately upon receipt and recorded on the following amendment record.

AMENDMENT RECORD

Amendment

Number

Amendment

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Changed

Date

Entered

Entered By

Performed at factory

2 May 24\06 Pg iii, 1

Performed at factory

Insert any Amendment Instruction sheets after this page.

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INSTALL_OPS

MANUAL AMENDMENT

Manual: SM34 (AA21-400) Amendment #: 3

Document # SM34\Install_Ops\809-0003 Amendment Date:

Apr 21, 2009

The purpose of this amendment is to add the latest drawings to the manual.

Amendment Instructions:

Remove Pages Replace With Pages

2-5 Rev 4.00 Amendment 1 2-5 Rev 4.00 Amendment #3

2 Remove Drawings (Section 2) Replace or add Drawings (Section 2)

AA21\400\403-0 Rev 1.00

AA21\400\905-0 Rev 1.00

AA21\400\403-0 Rev 1.01

AA21\400\905-0 Rev 1.10

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INSTALL_OPS

MANUAL AMENDMENT

Manual: SM34 (AA21-400)

Document # SM34\Install_Ops\809-0002

Amendment #: 2

Amendment Date: May 24, 2006

The purpose of this amendment is to correct the numbering sequence and add section

1.5 Accessories Required But Not Supplied to the table of contents.

Amendment Instructions:

1 Remove Pages Replace With Pages

Title Section Page iii Rev 4.00

1-3 and 1-4 Rev 4.00

Title Section Page iii Rev 4.00 Amendment #2

1-3 and 1-4 Rev 4.00 Amendment #2

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INSTALL_OPS

MANUAL AMENDMENT

Manual: SM34 (AA21-400) Amendment #: 1

Document # SM34\Install_Ops\809-0001 Amendment Date: Jan 18, 2005

The purpose of this amendment is to add the Environmental Qualification Form (521-0) to section 2.5 and to update the section 2.3.4 Cable Wiring statement paragraph 1.

Amendment Instructions:

1 Remove Pages Replace With Pages

2-1, 2-2 and 2-5 Rev 4.00 2-1, 2-2 and 2-5 Rev 4.00 Amendment #1

Remove Drawings/Documents (Section 2) Replace or add Drawings/Documents (Section 2)

- AA21\400\521-0 Rev 1.20

Note : Ensure that all drawings are inserted in the order shown on the latest drawing lists.

3 Update the Amendment Record sheet at the front of the manual.

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SM34 Rev. 4.00 AA21-400 Cabin PA System Manual

Section Title Page

1.0 Description

1.1 Introduction

1.2 Purpose of Equipment

1.3 Features

1-1

1.4 Specifications

1.4.1

1-2

Specifications 1-2

1.4.3 Specifications

1-5

2.0 Installation

2.1 Introduction

2.2 Unpacking

2-1

Inspection 2-1

2.3 Installation 2-1

2.3.1 Note to Installers 2-1

2.3.4

Warnings

Cautions

Cabling and Wiring

2.3.5 Post-Installation Checks

Adjustments

2-1

2-2

2-4

2-5 2.5 Installation

3.0 Operation

3.1 Introduction

3.3 Techniques of Voice Transmission operation

3.4.2

3.4.3

3.4.5

Input Function Selection

Remote Power Switch

3-1

3-2

3-3

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SM34 Rev. 4.00

Section 1.0 Description

1.1 Introduction

This manual contains information on the AA21-400 Cabin PA System.

Information in this section consists of purpose of equipment, features and specifications.

1.2

The AA21-400 Cabin PA control unit is designed to provide centralized control for an aircraft’s internal and external PA systems. The design is contained in one panelmounted unit, with an illuminated faceplate. All audio and keylines are interfaced to existing aircraft audio systems. Front panel switches provide selection of the various operational modes of the AA21 and a potentiometer provides output volume control.

1.3

Purpose of Equipment

Features

AA21-400 Cabin PA System Manual

The AA21-400 provides selection and control of internal and/or external PA system(s) installed in an aircraft. The integrated 25 W speaker driver circuit is designed to drive one 8 Ω speaker arrangement for internal paging. The AA21-400 also provides a lowlevel audio signal output that drives the input on a remote mounted power amplifier. The output is designed to drive the NAT PA110/220 or PA250/700 series amplifiers. The

AA21-400 provides generation of wail and yelp siren audio on the low level output when selected on the front panel.

A ‘+3 dB’ function allows the output level of the system to be varied by 3 dB. When the input control line is grounded, the output is reduced by approximately 3 dB, and removing the ground returns the system to full output.

Thermal protection is designed into the intermediate and final stage amplifiers to protect the unit during very hot or extended high power operating conditions.

Four front panel switches provide selection of the various operational modes of the

AA21-400 as described in Section 3 of this manual (Operation).

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AA21-400 Cabin PA System Manual

1.4 Specifications

Power Supply

Normal:

Input Current:

Input Signals

Backlighting:

Microphone:

ALC

Impedance

Music:

150 Ohm amplified dynamic.

250 mVrms rated input level.

Automatic level controlled for maximum intelligibility without distortion starts @ 130 mVrms.

130 Ohm ± 10%.

Only one of Radio (Receive) or CD may be enabled at a time.

Radio (Receive) 2.5 Vrms into 1k Ω ± 10%.

CD 1.0 Vrms into 11k Ω ± 10%.

PA key:

+3dB key:

Input to Input Crosstalk:

Linear DC (with reverse & over voltage protection):

+30.3 Vdc maximum.

2.3 A max. full speaker power (35 W) @ +27.5 Vdc.

2.9 A max (35 W) with 0.40 A load on Switched

Power Output.

0.40 A idle @ +27.5 Vdc.

150 mA max @ +27.5 Vdc.

Active open, isolated through optical relay. Max. current source 13 mA. Reduces all audio, except sidetone, by 3 dB when grounded. The output will be reduced 2 to 3 dB if operating above 25 W on speaker output, or above 6.5 Vrms on PA output.

≤ -40 dB from rated output.

SM34 Rev. 4.00

Active low. Max. current source 15 mA.

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SM34 Rev. 4.00

Output Signals

Speaker:

PA:

AA21-400 Cabin PA System Manual

Impedance and short circuit protected.

≤ 10% THD 20 W single tone into 8 Ω @ 50% duty cycle. Continuous.

20 W voice/music into 8 Ω @ 100% duty cycle. Continuous.

Note: Distortion is ≤ 3% THD at 10% of continuous output power rating.

> 10% THD 35 W max. into 8 Ω with 2.5 Vrms into Radio (Receive) input.

Distortion: ≤ 3% THD at rated output.

Audio bandwidth: Mic input: ≤ 3 dB roll-off from 350 Hz to 3 kHz

Audio bandwidth: Mic input:

Siren:

Radio (Receive)/CD input:

PA250/700 (0.5 Vrms ±

≤

3 dB roll-off from 350 Hz to 3 kHz

3 dB roll-off from 350 Hz to 6 kHz

Selectable by internal jumper for either

PA110/220 (6.5 Vrms ± 10% into 600 Ω ) or

10% into 600 Ω ) for rated output.

Radio (Receive)/CD input: ≤ 3 dB roll-off from 350 Hz to 6 kHz

Only available on PA output (735 to 1620 Hz). Yelp and wail modes with adjustable rates. Siren level control provided for yelp/wail by one internal trimpot.

Sidetone: Adjustable 0-100 mW into 600 Ω with ≤ 10% THD bandwidth:

Input to Output

Crosstalk:

≤ -50 dB from rated output.

Audio Noise Level: ≤ -50 dB from rated output.

Switched Power: +27.5 Vdc @ 0.40 Amps max.

Over current protected.

Temperature Sensor The unit contains a temperature sensor IC which when triggered reduces the input signals by 3 dB.

The IC threshold is set to approximately 130 ° C.

Annunciator Power On (illuminates green when active)

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AA21-400 Cabin PA System Manual

Height 1.11 ± 0.8 mm)

Depth

Heat sinks:

6.53 ± 0.03” (165.9 ± 0.8 mm) behind panel (including connector).

Width 4.96 ± 0.8 mm) behind panel.

Mounting

5.75 0.8 mm) in front of panel.

Weight 1.40 ± 0.03 kg)

Std. Dzus Mounting (4 fasteners)

Faceplate

Material/Finish

Engraved acrylic edge lit panel, with 28 Vdc backlighting.

Chassis & cover: 5052-H32 brushed aluminum with chromate conversion finish. de-burred 6063-T6 aluminum with chromate conversion finish.

Connector Male filtered 25 pin D-subminiature with Positronics

V5 locking tabs.

1.4.3 Environmental

Operating ° C to +55 ° C

Survival ° C to +85 ° C

Humidity

SM34 Rev. 4.00

DO-160D Env. Cat. B4-BAB[(SBM)(UF)]XXXXXXZBABB[TTX]MXXXX

TSO Compliance TSO-C50c, RTCA DO170 Class II

(Applicable to units Serial # 1200 and up)

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SM34 Rev. 4.00

1.5

AA21-400 Cabin PA System Manual

Accessories Required But Not Supplied

Installation kit p/n AA21-400-IKC (crimp) or AA21-400-IKS (solder) is required to complete the installation. They consist of the following:

AA21-400-IKC (crimp) NAT Part #:D25SV-IKC

Quantity Description

D-min 25 Socket housing

MS Crimp Socket

25 Pin JVL Hood/Locklever

AA21-400-IKS (solder) NAT Part #:D25SV-IKS

Quantity Description

D-min 25 Socket Solder Cup

25 pin JVL Hood/Locklever

End of section 1.0

NAT Part #

20-21-025

20-26-901

20-29-250

NAT Part #

20-20-025

20-29-250

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SM34 Rev. 4.00 AA21-400 Cabin PA System Manual

Section 2.0 Installation

2.1 Introduction

Information in this section consists of: unpacking and inspection procedures, installation procedures, post-installation checks, and installation drawings.

2.2 Unpacking and Inspection

Unpack the equipment carefully and locate the warranty card. Inspect the unit visually for damage due to shipping and report all such claims immediately to the carrier involved. Note that each unit should have the following:

- AA21-400 Cabin PA System

- Warranty Card

- Operator’s Manual

- Release certification

Verify that all items are present before proceeding and report any shortage immediately to your supplier.

Complete the warranty card information and send it to NAT when the installation is complete. If you fail to complete the warranty card, the warranty will be activated on date of shipment from NAT.

2.3.1 Note to Installers

The AA21-400 is intended for use as a cockpit-mounted control for an internal or external aircraft PA system, where such a system is not installed to fulfill the airworthiness requirements for the aircraft or an operating rule.

The AA21-400 is certified to RTCA DO-160D Section 20 (RF Susceptibility) Category T, for installation in a well-protected electromagnetic environment such as an enclosed avionics bay in an all-metallic aircraft. The equipment shall therefore not be installed to satisfy the requirement of FAR 25.1423 for a Public Address system.

2.3.2 Warnings

Never ground any audio output line from the AA21-400 or permanent damage may result.

Always check ADF and compass calibration after installing external speakers or PA amplifiers. Significant single cycle errors may be caused by the concentration of steel and magnetic material. Do not bundle any lines from these units with transmitter coax lines.

Do not bundle any lines from this unit with 400 Hz synchro wiring, or AC power lines.

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AA21-400 Cabin PA System Manual

2.3.3 Cautions

SM34 Rev. 4.00

Use shielded cable exactly as shown and ground as indicated . All audio installations can be severely degraded by incorrect wiring and shielding. Unusual buzzes, hums or other background audio are symptomatic of multiple grounds, or noisy external systems such as blowers or pumps sharing wiring with the audio system. Never operate any of these units below their 8 Ω rated impedance.

2.3.4 Cabling and Wiring

All unshielded wire shall be selected in accordance with AC43.13-1B Change 1,

Paragraphs 11-76 through 11-78. Wire types should be to MIL-W-22759 as specified in

AC43.13-1B Change 1, Paragraphs 11-85, 11-86, and listed in Table 11-11. For shielded wire applications, use Tefzel MIL-C-27500 shielded wire with solder sleeves

(for shield terminations) to make the most compact and easily terminated interconnect.

Follow the wiring diagrams in Section 2.6 as required.

Allow 3 inches from the end of the wire to the shield termination to allow the hood to be easily installed. Note that the hood is a ‘clamshell’ hood, and is installed after the wiring is complete.

All wiring should be at least 22 AWG, except power and ground lines, which should be at least 20 AWG. Ensure that all ground connections are clean and well secured. To prevent system failure or inadequate equipment protection, power must be supplied from a separate breaker or fuse and not connected to any other source.

2.3.5 Post-Installation Checks

2.3.5.1 Voltage/resistance

Do not attach the AA21-400 until the following conditions are met.

Check the following: pins and <3> for +28 Vdc relative to ground. b) P101 <14>, <15> and <16> for continuity to ground (below 0.5 Ω ). c) P101 and <22> (with switches open) for infinite resistance to ground (> 10 M Ω ). d) P101 pin <5> to pin <7> for 4 – 6 Ω (typical).

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SM34 Rev. 4.00

2.3.5.2 Power On checks

AA21-400 Cabin PA System Manual

WARNING

The AA21-400 is a high power device, capable of producing tones at very high volume levels. Ensure that all personnel are well clear of the aircraft prior to keying the siren or PA.

Failure to adhere to this warning could cause injury to personnel and/or damage to equipment. DO NOT conduct the following tests inside an enclosed area (i.e. a hangar.) a) Install the Cabin PA system and remote amplifier(s) and speaker(s) as applicable, and then power up the ship’s systems. Turn on all of the radios and other accessories required for this system. Check that the POWER ON LED on the AA21-400 illuminates when the power switch is selected to ON . b) From the front panel switches, select PA and EXT. Key the siren using the front panel switch and remote Siren key as described in Section 3.4.4.1. The siren should sound on the external PA speakers, and the level should be at maximum volume (the VOL control fully cw). If the siren rate needs adjustment use the corresponding trimpot on the top of the AA21-400. Refer to section 2.3.6.1 for details. c) Configure the audio system as required to allow connection of the pilot's mic to the PA and key the cyclic switch for transmit. The mic audio should be heard on the PA speakers. Adjust the front panel level control for the desired volume. Set the front panel switch to RADIO, and check for correct radio operation and note what volume settings will produce a suitable external paging level. USE CARE

TO AVOID FEEDBACK INTO THE MICROPHONE!

Note : A faint audio signal may be heard at the speaker (even when the system is not paging) due to the very high gain of this system and stray coupling in the wiring.

It should not be audible in flight.

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AA21-400 Cabin PA System Manual

2.3.6 Adjustments

SM34 Rev. 4.00

The unit ships from the factory with all internal adjustments set to the normal test levels.

Once installed in the aircraft, it may be desirable to change some of these settings to best suit the local operating environment. The internal adjustments are accessible through holes located on the top of the unit.

Level Adjustments

Sweep Rate

Adjustments

Configuration

Jumpers

The sweep rates for the wail and yelp modes of the siren are adjustable using the appropriately marked pots. The yelp rate is adjustable from 48 cycles/min to 300 cycles/min, and the wail rate is adjustable from 5 cycles/min to 200 cycles/min. Rotating a pot cw will increase the sweep rate, and ccw will decrease it.

The sidetone, mic, siren, receive, and internal speaker levels are all adjustable by rotating the appropriate pots cw to increase the level, and ccw to decrease it. The external speaker level is adjustable by rotating the appropriate pot cw to decrease the level, and ccw to increase it.

The range adjustments for the potentiometers are given below:

External speaker level: (60dB dynamic range)

Internal speaker level: (90dB dynamic range)

S/T level: (100dB dynamic range)

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SM34 Rev. 4.00

Mic level:

Receive level:

Siren level:

2.3.6.3 Configuration Jumpers

AA21-400 Cabin PA System Manual

(60dB dynamic range)

(70dB dynamic range)

The configuration options for the AA21-400 can be selected by installing jumpers as shown below:

RX/CD: Pins 1-2 : Radio (Receive) input enabled,

EXT SPKR LEVEL :

Pins 2-3 :

CD input disabled

CD input enabled,

Radio (Receive) input disabled

Installed : 500 mVrms output level

Not installed : 6.5 Vrms output level

Maintenance of the AA21-400 is ‘on condition’ only. Periodic maintenance of this product is not required.

DRAWING REV. DESCRIPTION TYPE SERIAL #

Interconnect

Connector Map

All

AA21\400\521-0 1.20 AA21-400 Cabin PA System Environmental Qual Form 1200 and up

Faceplate All

Mech. Installation 1015 – 1199 AA21\400\922-0 1.00 AA21-400 Cabin PA System

AA21\400\922-0 1.11 AA21-400 Cabin PA System Mech. Installation 1200 and up

Section 2.0 ends after these Drawings

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ENVIRONMENTAL QUALIFICATION FORM

Document #: AA21\400\521-0

NATPart#: AA21-4xx TSO #: C50c

Manufacturer's Specif ication and/or Other Applicable Specif ication:

RTCA DO-1 60D

Manufacturer: Northern Airborne Technology Ltd.

Address: #14

1925 Kirschner Rd., Kelowna, BC, Canada. VIY 4N7

Prepared By: Checked By: MT

Conditions

Temperature and Altitude

Low Temperatu re

High Temperature

Altitude

Tempe rature Variation

Humidity

Shock

Operational

Crash Safety

Vibration

Explosion Proofness

Waterproofness

DO-1 60D Section

4.0

4.5.1

4.5.2 & 4.5.3

4.6.1

Description of Conducted Tests

Equipment tested to Category B4

-30C Operating Low Temperature

+55C Operating High Temperature

+70C Short-term Operating High Temperature

See Remark (2)

5.0

6.0

Equipment tested to Category B

Equipment tested to Category A

7.0

7.2

7.3

8.0

9.0

10.0

Equipment tested to Category B

Test Procedure 1, Alternate Test Procedure

(Impulse)

Test Procedure 2 (Sustained), Unknown or

Random orientation in aircraft.

Equipment tested to categories SBM, UF

Equipment identified as Category X no test required

Equipment identified as Category X no test requ i

Rev: 1.20

ENG-FORM: 521-0102.DOT

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Conditions

Fluids Susceptibility

AA2 1 -4xx

DO-1 60D Section

11 .O

Description of Conducted Tests

Equipment identified as Category X no test required

Sand and Dust

Fungus Resistance

Salt Spray

12.0

13.0

14.0

Magnetic Effect

Power input

15.0

16.0

17.0 Voltage Spike

Audio Frequency Susceptibility 18.0 lnduced Signal Susceptibility 19.0

Radio Frequency Susceptibility 20.0

Radio Frequency Emission

Lightning lnduced Transient

Susceptibility

Lightning Direct Effects test

21 .O

22.0

23.0

Equipment identified as Category X no test required

Equipment is Class Z

Equipment tested to Category B

Equipment tested to Category A

Equipment tested to Category B

Equipment tested to Category TTX

Equipment tested to Category M

Equipment identified as Category X no test required lcing 24.0

Equipment identified as Category X no test required

Electrostatic Discharge (ESD) 25.0 Equipment identified as Category X no test requi red

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:#ne AA21-4xx Environmental Qualification Form

REMARKS

(1)

Tests were conducted at Northern Airborne Technology Ltd.

(2) AA21-401wastestedt055,000ft.

End of Environmental Qualification Form

Rev: 1.20

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SM34 Rev. 4.00 AA21-400 Cabin PA System Manual

Section 3.0 Operation

3.1 Introduction

Information in this section consists of the functional and operational procedures for the

AA21-400 Cabin PA system.

The AA21-400 Cabin PA system provides a central adjustment for internal and/or external aircraft paging functions. The AA21-400 is a self-contained amplifier that directly drives the cabin speaker(s) and/or the external PA system amplifier. When turned on, the system is ready for operation and will accept audio feeds or a microphone input. An internally generated siren is also available in WAIL or YELP modes. When the AA21-400 is turned on, a 28 Vdc switched signal is generated. This signal is used to turn on the PA amp relay (if connected in system). The high current

DC power to operate the PA110/220 or PA250/700 is supplied by the aircraft.

3.3 Techniques of Voice Transmission

To successfully project the human voice over long distances, it is necessary to develop a microphone technique different from the usual conversational manner. Place the microphone with the upper lip touching the mouthpiece and talk clearly and distinctly, with increased emphasis. Separate each word with noticeable pauses and keep the voice level constant. A medium pitched voice is more easily understood and carries farther than a bass voice.

To activate the AA21-400 Cabin PA system, flip the POWER toggle switch up to the ON position. The LED adjacent to the switch should illuminate.

Power Switch Indicator LED

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SM34 Rev. 4.00 AA21-400 Cabin PA System Manual

3.4.2 Input Function Selection

The Input Function switch is a two-position, locking switch on the front of the AA21-400 that is used to select between PA and Radio operation. When PA is selected, RADIO is disabled, and vice versa. It is good practice to set this switch to PA when operating the siren to avoid mixing incoming radio/CD audio with the siren audio output.

Input Function Switch

Operation

For external PA/Siren systems or internal paging functions, set the function switch on the AA21-400 to PA. Key the microphone through the cyclic or hand mic switch, and speak in a firm, clear manner.

3.4.2.2 Radio

To set the system for radio rebroadcast functions, set the function switch on the AA21-

400 to RADIO. All audio delivered from the source (typically pilot’s or copilot’s headset) will be broadcast from the PA system or internal speaker.

Volume Control

The volume control knob ( VOL ) on the front of the AA21-400 is used to adjust the level of the selected output. Rotating the knob cw will increase the volume, and ccw will decrease it. For external paging and rebroadcast operations, the volume should always be set between half and full level. The setting for internal paging must be determined by experiment to provide the desired coverage in the passenger area and to prevent feedback.

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SM34 Rev. 4.00

Siren Mode Switch

AA21-400 Cabin PA System Manual

Internal/External Mode Switch

The siren mode switch is a three position, centre-off locking switch on the front of the

AA21-400. The siren is operated by selecting the mode ( YELP or WAIL ) and then activating a remote Siren key. The siren will sound only as long as the mode is selected to WAIL or YELP and the Siren key is activated. It should be noted that in some installations, the remote Siren key is connected directly to ground. In this case, the siren will sound as soon as either YELP or WAIL is selected.

Note: Siren audio is only available when the INT/EXT switch is selected to EXT . (See section 3.4.4.2.)

3.4.4.2 Internal/External Mode Switch

The INT/EXT mode switch is a two position locking switch that routes the selected audio either to the internal 8 Ω speaker ( INT ) or to the PA via an amplifier such as the NAT

PA250/700 or PA110/220 ( EXT ).

3.4.5 Remote Power Switch

The AA21-400 provides a switched 28 Vdc low current output that is typically used to control the dc power circuit of an NAT PA110, PA220, PA250 or PA700.

Note : This output is only available when the power switch is in the ON position.

End of section 3.0

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AA21-401 Remote Cabin PA System

SM34 Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-401 Remote

Mount Cabin PA system. Installation and operation information common to the AA21-400 base unit can be found in the SM34 Installation and Operation Manual.

Section 1 Description

The AA21-401 Remote Mount Cabin PA system is designed to provide centralized control for an aircraft’s internal and external PA systems. The unit is a remote mounted box designed to interface to external user controls. All power, audio and keylines are interfaced to existing aircraft audio systems through a second external connector.

1.1 Performance/Function

The AA21-401 provides an internal PA and/or drive circuitry for external PA system(s) installed in an aircraft. The integrated 20 W speaker driver circuit is designed to drive one 8 Ohm speaker arrangement for internal paging. The AA21 also provides a low-level audio signal output to drive remote mounted power amplifiers. It may be configured to drive either the PA110/220 series amplifiers, or the PA250/700 series amplifiers. The AA21 provides wail and yelp siren audio on the low level output when selected via the external user controls.

A ‘+3 dB’ function allows the output level of the system to be varied by 3 dB. When the input control line is grounded, the output is reduced by approx 3 dB. Removing the ground returns the system to full output.

Thermal protection is designed into the intermediate and final stage amplifiers to protect the unit during very hot or extended high power operating conditions.

Current protection is provided using one fuse on the +28 Vdc power input and a second fuse on the switched power output.

Connections are provided to interface four front panel switches allowing selection of the various operational modes of the AA21; POWER (Power On/Off), INT/EXT (Internal SPKR on/External PA on),

YELP/OFF/WAIL (Yelp siren on/Siren off/Wail siren on), RADIO/PA (radio [receive] input enabled/PA Mic input enabled). Interface to a front panel potentiometer is included, to provide volume level control of the selected output. The interface can also drive an annunciator to provide Power On indication.

The AA21-401 is identical to the AA21-400, with the following additions:

Remote Control Connector

Input Signals

+28 VDC Switched

External Speaker Select

Internal Speaker Select

PA Select

Radio Select

Rx Disable

Active low, 5 mA max

Active low, 10 mA max

Active low, 5 mA max

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AA21-401 Remote Cabin PA System

SM34 Installation and Operation Manual Supplement

Output signals

Wail Select (On)

Yelp Select (On)

Wail Siren Select (Return)

Yelp Siren Select (Return)

Pot Wiper

+28VDC Power

Pot Hi

Pot Lo

Active low 5 mA max

0 to 10 kOhm

10% (referenced to Pot Lo)

3 Amps maximum current.

10 kOhm

10% (referenced to Pot Lo)

Height

Depth

Width

1.15" (29.2 mm) max

7.32" (185.9 mm) max

5.05" (128.2 mm) max

Weight

Mounting

1.31 lbs. max

Bulkhead mount with four 10-32 screws

Material/Finish

Chassis/cover

Heat sinks

5052-H32 brushed aluminium with chromate conversion finish.

De-burred 6061-T6 aluminium with chromate conversion, mounted along each side of unit.

Connectors Male filtered 25 pin D-subminiature with Positronics V5 locking tabs.

Female filtered 25 pin D-subminiature with Positronics

V5 locking tabs.

Install Kits One D25SV-IKC and one D25PV-IKC

(See section 2.1 below.)

The AA21-401 is identical to the AA21-400, with the following exception:

Section 2 Installation

For installation information and drawings, see SM34 Section 2. Select the appropriate revision of the drawing for the serial number of the unit. The drawings specific to this derivative are listed below and can be found at the end of this supplement.

The AA21-401 is a remote mount unit, intended for installation in an enclosed avionics bay. The note to installers in SM34 Section 2.3.1 does not apply to the AA21-401.

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2.1

AA21-401 Remote Cabin PA System

SM34 Installation and Operation Manual Supplement

Accessories Required But Not Supplied

Installation kits p/n D25SV-IKC and D25PV-IKC are required to complete the installation. The kits consist of the following:

NAT Part #:D25SV-IKC

Quantity Description NAT Part No.

NAT Part #: D25PV-IKC

Quantity

D-min 25 Socket housing

MS Crimp Socket

25 pin JVL Hood/Locklever

Description

D-min 25 Pin Housing

MS Crimp Pin

25 Pin JVL Hood/Locklever

20-21-025

20-26-901

20-29-250

NAT Part No.

20-11-025

20-26-891

20-29-250

Select the appropriate revision of the drawing for the serial number of the unit under consideration. The drawings specific to this derivative are listed below, and can be found at the end of this supplement.

DOCUMENT REV. DESCRIPTION TYPE SERIAL NO.

AA21\401\403-0 1.01 Remote Mount Cabin PA System

AA21\401\403-1 1.01 Remote Mount Cabin PA System

AA21\401\403-2 1.01 Remote Mount Cabin PA System

AA21\401\405-0 1.00 Cabin PA System Remote Amp

AA21\401\922-0 1.00 Remote Mount Cabin PA System

Interconnect

Connector Map

1337 and up

Mechanical Installation 1337 and up

Section 3 Operation

For operation information, see SM34 Section 3.

The available features will depend upon the remote panel interfacing with this unit.

Supplement ends

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AA21-405 Cabin PA System

SM34 Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-405 Cabin PA system. Installation and operation information common to the AA21-400 base unit can be found in the

SM34 Installation and Operation Manual.

Section 1 Description

The AA21-405 is identical to the AA21-400 with the following exceptions: a) The faceplate is 5V Type IV NVIS Green A.

The POWER ON LED is not installed. b) c) Changes to the faceplate text can be found by comparing Figure 1 to Figure 2:

Figure 1: AA21-400 Faceplate.

Figure 2: AA21-405 Faceplate.

Section 2 Installation

AA21\405\403-0 1.01 Cabin PA System

TYPE

Interconnect 1607 and up

AA21\405\405-0 1.00 Cabin PA System

AA21\405\905-0 1.00 Cabin PA System

AA21\405\922-0 1.00 Cabin PA System

Connector Map

Faceplate

1607 and up

Mechanical Installation 1607 and up

Section 3 Operation

For operation information, see SM34 Section 3.

Supplement ends

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AA21-406 PA Controller

SM34 Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-406 PA

Controller. Installation and operation information common to the AA21-400 base unit can be found in the

SM34 Installation and Operation Manual.

Section 1 Description

The AA21-406 provides control for an aircraft’s internal and external PA systems. Audio inputs include microphone, receive audio or CD input. Receive audio or PA mic input is selectable on the front panel.

Adjustable sidetone is provided for the mic input. A PA output with adjustable level is available. Thermal and short circuit protection are provided for the internal speaker output electronics. Wail or yelp siren is selectable on the front panel and activated by enabling the siren keyline.

Figure 1: AA21-400

Figure 2: AA21-406 d) e)

The AA21-406 is identical to the AA21-400 with the following exceptions: a) The speaker output is replaced with a CABIN PA MIC output. b) c)

An INT/EXT discrete function is added.

The POWER switch is removed. The unit is hard-wired to be on.

The faceplate backlighting is 5 Vdc.

Changes to the faceplate text can be found by comparing Figure 1 to Figure 2.

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AA21-406 PA Controller

SM34 Installation and Operation Manual Supplement

Section 2 Installation

DOCUMENT REV. DESCRIPTION

AA21\406\403-0 1.00 PA Controller

AA21\406\405-0 1.00 PA Controller

AA21\406\905-0 1.00 PA Controller

AA21\406\922-0 1.01 PA Controller

Section 3 Operation

For operation information, see SM34 Section 3.

Supplement ends

TYPE

Interconnect

Connector Map

Faceplate Sht 1 of 2

Mechanical Installation

SERIAL NO.

1498 and up

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AA21-407 PA Controller

SM34 Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-407 PA

Controller. Installation and operation information common to the AA21-400 base unit can be found in the

SM34 Installation and Operation Manual.

Section 1 Description

The AA21-407 is identical to the AA21-400 with the following exceptions: a) Changes to the faceplate text can be seen by comparing Figure 1 to Figure 2.

Figure 1: AA21-400 b) c) d) e)

Figure 2: AA21-407

The speaker output is replaced with a CABIN PA MIC output.

An INT/EXT discrete function is added.

The POWER switch and POWER ON indicator are not installed and the unit is hardwired on.

The faceplate backlighting is 5 Vdc NVIS Green A compliant.

Section 2 Installation

DOCUMENT REV. DESCRIPTION

AA21\407\403-0 1.00 PA Controller

AA21\407\405-0 1.00 PA Controller

AA21\407\905-0 1.00 PA Controller

AA21\407\922-0 1.00 PA Controller

TYPE SERIAL NO.

Interconnect 1588 and up

Connector Map 1588 and up

Faceplate 1588 and up

Mech. Installation 1588 and up

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Section 3 Operation

For operation information, see SM34 Section 3.

Supplement ends

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AA21-408 Cabin PA System

Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-408 Cabin PA

System. Installation and operation information common to the AA21-400 base unit can be found in the

Installation section of the SM34 Installation and Service Manual.

1. Description e) f) c) d)

The AA21-408 is identical to the AA21-400 with the following exceptions: a) b)

The speaker output is replaced with a CABIN PA MIC output.

An INT/EXT discrete function is added.

The standard white backlighting is changed to NVIS Green 'B' backlighting.

The Power On LED indicator is not installed.

The Volume knob is replaced by a grey edge lighted knob.

The bat cover on the POWER switch is white instead of green.

2. Installation

For general Installation information and drawings, see Service Manual SM34 Section 2. Select the appropriate revision of the drawing for the serial number of the unit. The drawings specific to this derivative are listed below and can be found at the end of this supplement.

2.1 Installation Drawings

DESCRIPTION

AA21-408

AA21\408\403-0 1.00 Cabin PA System

AA21\408\405-0 1.00 Cabin PA System

AA21\408\922-0 1.00 Cabin PA System

3. Operation

For general operation information, see Service Manual SM34 Section 3.

Supplement ends

TYPE

Interconnect

Connector Map

Mechanical Installation

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AA21-450 Cabin PA System

SM34 Installation and Operation Manual Supplement

This supplement contains installation and operation information that is unique to the AA21-450 Cabin PA system. Installation and operation information common to the AA21-400 base unit can be found in the

SM34 Installation and Operation Manual.

Section 1 Description

The AA21-450 is identical to the AA21-400 with the following exceptions: a) Changes to the faceplate text can be seen by comparing Figure 1 to Figure 2.

Figure 1: AA21-400 b) c)

Figure 2: AA21-450

The backlighting subassembly is powered by +5 Vdc instead of +28 Vdc.

All instances of signal name “+28V LIGHTS” are replaced with “+5V LIGHTS”.

Section 2 Installation

DOCUMENT REV. DESCRIPTION

AA21\450\403-0 1.01 PA Controller

AA21\450\405-0 1.00 PA Controller

AA21\450\905-0 1.10 PA Controller

TYPE

Interconnect

Connector Map

Faceplate Sht 1 of 3

SERIAL NO.

1220 and up

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AA21-450 Cabin PA System

SM34 Installation and Operation Manual Supplement

Section 3 Operation

For operation information, see SM34 Section 3.

Supplement ends

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