Garmin | GMA™ 342 | Garmin GMA™ 342 GMA 342 Pilot's Guide

Garmin GMA™ 342 GMA 342 Pilot's Guide
GMA 342
pilot’s guide
Copyright © 2016 - 2018 Garmin Ltd. or its subsidiaries. All rights reserved.
This manual reflects the operation of GMA 342 units. Some differences in operation
may be observed when comparing the information in this manual to earlier or later
Mod status levels.
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February, 2018
190-01878-00 Rev. C
Printed in the U.S.A.
AVIATION LIMITED WARRANTY
All Garmin avionics products are warranted to be free from defects in materials
or workmanship for the earlier of: 2 years or 800 flight hours from the date of
purchase for new TSO remote-mount and TSO panel-mount products; 1 year or
400 flight hours from the date of purchase for new Non-TSO remote-mount* and
Non-TSO panel-mount*, portable products and any purchased newly-overhauled
products; 6 months or 200 flight hours for factory repaired or newly-overhauled
products exchanged through a Garmin Authorized Service Center. Within the
applicable period, Garmin will, at its sole option, repair or replace any components
that fail in normal use. Such repairs or replacement will be made at no charge to
the customer for parts or labor, provided that the customer shall be responsible
for any transportation cost. This Limited Warranty does not apply to: (i) cosmetic
damage, such as scratches, nicks and dents; (ii) consumable parts, such as batteries,
unless product damage has occurred due to a defect in materials or workmanship;
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This Limited Warranty also does not apply to, and Garmin is not responsible for,
any degradation in the performance of any Garmin navigation product resulting
from its use in proximity to any handset or other device that utilizes a terrestrial
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valid in the area of intended distribution. Devices purchased in the U.S. or Canada
must be returned to the Garmin service center in the U.K., the U.S., Canada or
Taiwan for service.
CAUTION: Incorrect aircraft wiring could short the left channel or
both channels to ground if a monaural headset is plugged into
the stereo jacks. If wired incorrectly, fail-safe operation will not
work.
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This device complies with Part 15 of the FCC Rules. Operation is subject to the
following two conditions: (1) this device may not cause harmful interference, and (2)
this device must accept any interference received, including interference that may
cause undesired operation.
NOTE: This device complies with Innovation, Science and Economic Development
Canada license-exempt RSS standard(s). Operation is subject to the following two
conditions: (1) this device may not cause interference, and (2) this device must accept
any interference, including interference that may cause undesired operation of the
device.
Cet appareil est conforme aux normes RSS sans licence du ministére Innovation,
Sciences et Développement économique Canada. Son fonctionnement est soumis
aux deux conditions suivantes : (1) ce périphérique ne doit pas causer d’interférences
et (2) doit accepter toute interférence, y compris les interférences pouvant entraîner
un fonctionnement indésirable de l’appareil.
Part Number
190-01878-00
Rev
Date
A July, 2016
Change Summary
Initial release
Description
Production Release
B
September, 2017
Updated compliance statements
C
February, 2018
Updated labeling error. Added SLA.
Table of Contents
Features and Operation...............................................................................................7
Power-Up....................................................................................................................8
Mono/Stereo Headsets................................................................................................8
Left/Right Knobs.........................................................................................................8
Transceivers................................................................................................................9
Split-COM Mode.............................................................................................10
Transmit Indications........................................................................................10
Enabling/Disabling Monitored COM Muting...................................................10
Receivers...................................................................................................................12
Nav Receiver...................................................................................................12
Auxiliary Inputs...............................................................................................12
Marker Beacon Receiver..................................................................................13
Turning Marker Beacon Audio On..........................................................14
Muting Marker Beacon Audio................................................................14
Deselecting Marker Beacon Audio.........................................................14
Intercom System (ICS)...............................................................................................14
Pilot Isolate Mode...........................................................................................15
Crew Isolate Mode..........................................................................................15
Intercom Volume.............................................................................................15
Radio Mute Music...........................................................................................15
ICS Mute Music...............................................................................................16
Passenger Muting............................................................................................16
Speaker.....................................................................................................................16
Passenger Address Mode (PA Mode).........................................................................16
Split-PA Mode.................................................................................................17
3D Audio...................................................................................................................17
Enabling 3D Audio..........................................................................................17
Clearance Recorder and Player.................................................................................19
Entertainment Inputs................................................................................................21
Front Panel Jack..............................................................................................22
Music Effects...................................................................................................22
Entertainment Muting.....................................................................................23
Enabling/Disabling Muting....................................................................23
Fail-Safe Operation...................................................................................................24
6
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
FEATURES AND OPERATION
The GMA 342 Audio Panel provides the traditional audio selector functions
of microphone and receiver audio selection. The Audio Panel includes an
intercom system (ICS), a marker beacon receiver, a COM clearance recorder,
and a 3.5 mm music or phone jack. Ambient noise from the aircraft radios
is reduced by Avionics Squelch (ASQ). When no audio is detected, ASQ
processing further reduces the amount of background noise. Intercom
squelch threshold adjustments are handled automatically by the system.
Pushbutton keys control audio selection. When a key is selected, a green
annunciator on the key is illuminated. Annunciator brightness is adjusted
automatically by photocell dimming. Key brightness is adjusted by the radio
dimming bus control. Three Aux inputs are available for additional avionics
or audio devices.
Upon installation, the unit may be configured in various ways depending
on aircraft type and the needs of the pilot.
Ambient Light Sensor
Marker Beacon Lights
Front Panel Jack
GMA 342
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Garmin GMA 342 Pilot’s Guide
7
GMA 342 Audio Panel
POWER-UP
The GMA 342 performs a self-test during power-up. During the self-test
all Audio Panel annunciator lights illuminate for approximately two seconds.
Once the self-test is completed, most of the settings are restored to those in
use before the unit was last turned off.
MONO/STEREO HEADSETS
Stereo headsets are recommended when using the GMA 342. Using a
monaural headset in a stereo jack shorts the right headset channel output to
ground. While this does not damage the Audio Panel, a person listening on
a monaural headset hears only the left channel in both ears. If a monaural
headset is used at one of the passenger positions, any other passenger using a
stereo headset hears audio in the left ear only.
LEFT/RIGHT KNOBS
The Left Inner Knob powers-off the unit, and is used to control pilot ICS
volume. The Left Outer Knob controls pilot music volume. The Right Inner
Knob controls copilot and passenger ICS volume. The Right Outer Knob
controls the copilot and passenger music volume.
Left
Outer
Knob
Left
Inner
Knob
Right
Inner
Knob
Left Knob - Pilot
Volume Controls
8
Right
Outer
Knob
Right Knob - Copilot and
Passenger Volume Controls
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
Visual/Tactile
Feedback
Turn Left Inner Knob
All backlight
Power
OFF Audio to full counter-clockwise and annunciator
Panel
position
LEDs turn off
Minimum/maximum
Turn Left Inner Knob
volume is reached at
Pilot ICS
right/left to increase/
Volume
full counter-clockwise/
decrease volume
clockwise position
Minimum/maximum
Turn Left Outer Knob
volume is reached at
Pilot Music
right/left to increase/
Volume
full counter-clockwise/
decrease volume
clockwise position
Minimum/maximum
Copilot/ Turn Right Inner Knob
volume is reached at
Passenger right/left to increase/
full counter-clockwise/
ICS Volume decrease volume
clockwise position
Minimum/maximum
Copilot/
Turn Right Outer Knob
volume is reached at
Passenger
right/left to increase/
Music
full counter-clockwise/
decrease volume
Volume
clockwise position
Function
Action
Aural Feedback
Left Inner Knob
clicks
Pilot ICS volume
increases/
decreases
Pilot Music
volume increases/
decreases
Copilot and
Passenger ICS
volume increases/
decreases
Copilot and
Passenger Music
Volume increases/
decreases
Left/Right Knob Functions
TRANSCEIVERS
Audio from the #1 or #2 COM receiver can be selected independently by
pressing the respective Key(s) (COM1 or COM2). Pressing COM1 MIC or
COM2 MIC selects the #1 or #2 transmitter and simultaneously selects the
related COM receiver (COM1 or COM2) allowing received audio to be heard.
The other COM receiver can be added by pressing the respective key.
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Garmin GMA 342 Pilot’s Guide
9
GMA 342 Audio Panel
By default, while transmitting on a COM channel (as selected with the
COM1 MIC and COM2 MIC keys), both the transmitting and receiving audio
are heard on the COM channel. The GMA 342 can be configured to instead
mute receiving audio on a transmitting COM channel. A Garmin authorized
service center can make changes to the default configuration.
SPLIT-COM MODE
NOTE: Split COM performance is affected by the distance between
the COM antennas and the separation of the tuned frequencies. If the
selected COM frequencies are too close together, interference may be
heard during transmission on the other radio.
During Split-COM operation, both the pilot and the copilot can transmit
simultaneously over separate radios. The pilot uses COM1 and the copilot
uses COM2
Pressing both MIC Keys simultaneously initiates Split-COM Mode (i.e.,
COM1/COM2). The respective COM1/COM1 MIC and COM2/COM2 MIC
annunciators are illuminated indicating Split-COM operation. Split-COM
operation is cancelled by pressing one of the selected MIC Keys again.
TRANSMIT INDICATIONS
During COM transmission, the active transceiver (MIC1 or MIC2) Key
Annunciator flashes approximately once per second.
During Split-COM transmission, the MIC1 annunciator flashes when the
pilot’s microphone PTT is pressed. The MIC2 annunciator flashes when the
copilot’s microphone PTT is pressed.
ENABLING/DISABLING MONITORED COM MUTING
Press and hold COM1 or COM2 to enable/disable monitored COM muting
during reception of audio from the COM radio selected for transmission.
The aural message “Monitor Mute Enabled/Disabled” is heard.
10
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
Function
Action
COM Selection: Toggle
between COM enabled and
Press the
COM disabled (the audio from
corresponding COM
the current MIC selected COM
Key.
is always enabled and cannot
be disabled).
Key Annunciations
COM
Enabled
COM
Disabled
Press the
corresponding MIC
MIC Selection: Selects the
Key. The last MIC
COM used to transmit during
pressed remains
Push-to-Talk (PTT).
selected and
deselects all others.
MIC Enabled MIC Disabled
Transmit Indication: Audio
is sent from the corresponding Push-to-Talk (PTT)
Crew MIC to the selected
keyed.
COM. *
Split-COM Mode: The pilot
transmits on COM1 and the
copilot transmits on COM2
independently.
MIC in-key
annunciator
flashes.
Simultaneously press
COM1 MIC and
COM2 MIC keys.
* The pilot has priority when transmitting in the case that both crew members attempt to transmit
on the same COM.
Transceiver Key Functions
190-01878-00 Rev. C
Garmin GMA 342 Pilot’s Guide
11
GMA 342 Audio Panel
RECEIVERS
NAV RECEIVER
Pressing the NAV1 and/or NAV2 Key(s) selects/deselects the receiver audio
for the corresponding navigation radio source. The selected audio source
can be heard over the headset and the speaker (if selected). All radios can
be selected individually or simultaneously.
Selecting a NAV Radio Receiver
AUXILIARY INPUTS
The GMA 342 has 3 AUX inputs. There are two keys on the unit for AUX1
and AUX2. Pressing the AUX1 key selects or deselects both the AUX1 and
AUX3 receivers. Pressing the AUX2 key selects or deselects only the AUX2
receiver.
Selecting an Auxiliary Input
12
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
MARKER BEACON RECEIVER
The marker beacon receiver detects any marker beacon signal within the
reception range of the aircraft.
When a marker beacon signal is detected, the lamps illuminate, and an
associated keyed-tone is heard when MKR audio is selected. Marker beacon
lamps operate independently of any audio selection and cannot be turned
off.
Marker Beacon Key & Lamps
HI SENS Annunciator
The marker beacon signal sensitivity threshold can be set to either a
regular or high sensitivity. To toggle between the two, press and hold the
MKR/MUTE Key for 1 second. The HI SENS annunciator illuminates when
signal sensitivity is set to high.
The receiver detects the three marker tones (outer, middle, and inner).
Audio
Frequency
400 Hz
(Outer)
1300 Hz
(Middle)
3000 Hz
(Inner)
Audio Keying
−−−−−
−−−−−

Lamp Actuated
Blue
Amber
White
The GMA 342 provides three states of marker beacon operation; On,
Muted, and Deselected. The MKR/MUTE key annunciator indicates when
marker beacon audio is selected. Marker beacon audio is not heard when
the annunciator is off or when the annunciator is on with the marker beacon
audio muted.
190-01878-00 Rev. C
Garmin GMA 342 Pilot’s Guide
13
GMA 342 Audio Panel
TURNING MARKER BEACON AUDIO ON
With the MKR/MUTE annunciator off, press the MKR/MUTE Key to
activate marker beacon audio and illuminate the MKR/MUTE annunciator.
MUTING MARKER BEACON AUDIO
During marker beacon audio reception, press the MKR/MUTE Key
to mute the audio. The MKR/MUTE annunciator remains lit, but the
current marker tone is silenced. Audio muting deactivates automatically
and marker beacon audio is heard when the next marker beacon signal
is received.
DESELECTING MARKER BEACON AUDIO
To deselect marker beacon audio, press the MKR/MUTE Key twice
during marker beacon reception or once if a marker beacon signal is not
detected.
INTERCOM SYSTEM (ICS)
The GMA 342 includes a three-position intercom system (ICS), two MUSIC
inputs, and one telephone/entertainment input for the pilot, copilot and
passengers. The intercom provides Pilot and Crew audio isolation.
Intercom Controls
NOTE: The PILOT and CREW ICS ISOLATION states are exclusive. Both
cannot be active at the same time. When neither Pilot or Crew are
active, the unit is in All ICS mode. In this mode, the pilot, copilot, and
passengers communicate with each other.
14
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
PILOT ISOLATE MODE
Pressing the PILOT ‘ICS ISOLATION’ Key isolates the pilot from all other
ICS positions (copilot and passengers). The copilot and passengers share
communication between themselves but cannot communicate with the
pilot. A solid annunciation of the in-key annunciator indicates PILOT ICS
ISOLATION is active.
CREW ISOLATE MODE
Pressing the CREW ‘ICS ISOLATION’ Key places the pilot and copilot
on a common ICS communication channel. The passengers are on their
own intercom channel and can communicate with each other, but cannot
communicate with the pilot and copilot. A solid annunciation of the inkey
annunciator indicates CREW ICS ISOLATION is active.
INTERCOM VOLUME
The knobs on either side of the GMA 342 control intercom and music
volume independently. The left inner and outer knobs are dedicated to the
audio levels for the pilot headset; the right inner and outer knobs control
audio levels for not only the copilot but also any passenger headsets. The
inner, smaller knobs on both sides are used to control intercom volume for
the receiving headsets. The outer, larger knobs are used to control music
volume.
The left inner knob can be used to turn off the GMA 342 audio panel,
by turning fully counter-clockwise until the knob clicks. All backlight and
annunciator LEDs will turn off.
The position marks on all four knobs are not night-time visible.
RADIO MUTE MUSIC
Press and hold the MUSIC Key to enable or disable muting of music
channel 1 and music channel 2 when radio (i.e., COM, NAV, or AUX) audio
is active.
190-01878-00 Rev. C
Garmin GMA 342 Pilot’s Guide
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GMA 342 Audio Panel
ICS MUTE MUSIC
Press and hold the AUX2 Key to enable or disable muting of music audio
when intercom audio is active.
PASSENGER MUTING
Press and hold AUX1 to enable/disable passenger muting during COM
audio reception. The aural message “Passenger Mute Enabled/Disabled” is
heard.
SPEAKER
NOTE: Speaker audio turns off in circumstances where aircraft power
falls below 11 volts.
All of the radios can be heard over the cabin speaker. Pressing the SPKR
Key selects and deselects the cabin speaker. Speaker audio is muted when the
PTT is pressed. Certain aural alerts and warnings (autopilot, traffic, altitude)
are always heard on the speaker, even when the speaker is not selected.
Speaker Key
PASSENGER ADDRESS MODE (PA MODE)
Press and hold the SPKR Key for 1 second to initiate Passenger Address
Mode. PA Mode is annunciated by a rapid blinking of the SPKR annunciator.
When in PA Mode the crew can use the PTT “Push-to-Talk” button to deliver
announcements over the speaker and to the passenger headsets.
16
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
SPLIT-PA MODE
During Split-PA Mode the pilot can continue to use the COM1 for
transmission while the copilot delivers PA announcements. To initiate
Split-PA Mode, first enter Split-COM Mode by pressing both MIC Keys
simultaneously, then press and hold the SPKR Key for 1 second.
3D AUDIO
3D Audio is useful when multiple audio sources are present. By using
different responses in each ear, 3D audio processing creates the illusion that
each audio source is coming from a unique location or seat position.
Because this feature uses different signals for left and right channels,
it requires wiring for stereo intercom and stereo headsets. If 3D audio is
activated when mono headsets are in use, the listener will still hear all audio
sources; however, there is no benefit from location separation.
With a single COM selected and 3D Audio enabled, the listener hears the
audio source at the 12 o’clock position. If both COMs are selected, the listener
hears COM1 at 11 o’clock and COM2 at the 1 o’clock position. All other
intercom positions are processed to sound like their relative seat location.
By default, the GMA 342 assumes the pilot sits in the left seat. A Garmin
authorized service center can make changes to the default configuration.
ENABLING 3D AUDIO
Press and hold the PILOT Key to toggle 3D audio processing on and off
for all headset positions. When 3D Audio is enabled, the aural message “3D
audio left” is heard in the left ear followed by “3D audio right” in the right
ear. If the aural messages are not heard in only the left and then the right
ear respectively, the cause may be aircraft wiring or headset settings. Refer
to the following table if a headset or aircraft wiring problem is suspected.
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Garmin GMA 342 Pilot’s Guide
17
GMA 342 Audio Panel
Symptom(s)
“3D audio left”
1)
message heard in
both ears.
2)
“3D audio right”
message not
heard
3)
“3D audio left”
1)
message heard
in both ears,
2)
followed by “3D
audio right”
message heard in
both ears
3)
“3D audio right” 1)
message heard in
both ears. “3D
audio left” not
heard
18
3D Audio Troubleshooting
Cause(s)
Solution(s)
1) Use a stereo headset
Mono headset in
use
2) Set mono/stereo switch on headset
Stereo headset in
use with mono/
to ‘stereo’
stereo switch set to
‘mono’
3) If after checking solutions #1 and
Aircraft wiring has
left audio wired to
#2 see a service center as soon as
both left and right
possible to inspect/correct wiring.
channels of stereo
This wiring fault can cause fail-safe
headset jack
audio not to function.
1) Use a stereo headset
Mono headset in
use
2) Set mono/stereo switch on headset
Stereo headset in
use with mono/
to ‘stereo’
stereo switch set to
mono
3) If after checking solutions #1 and
Incorrect aircraft
wiring (left/right
#2 see a service center as soon as
shorted together)
possible to inspect/correct wiring.
This wiring fault can cause fail-safe
audio not to function.
1) See a service center as soon as
Incorrect aircraft
wiring (right channel
possible to inspect/correct wiring.
used for mono
This wiring fault can cause fail-safe
instead of left or
audio not to function.
left/right swapped)
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
3D Audio Troubleshooting
1) Stereo headset is on 1) Verify correct orientation from the
“3D audio left”
message heard
backwards
left/right indication on each side of
in right ear only
the headset or the position of the
followed by “3D
boom MIC (usually attached on left
audio right”
side). If the headset is backwards,
message heard in
the left/right position information
left ear only
will be swapped.
2) Incorrect aircraft
2) See a service center as soon as
wiring (left/right
possible to inspect/correct wiring.
channels swapped)
This wiring fault can cause fail-safe
audio not to function.
1) Aircraft wired for
1) See a service center to wire the
“3D audio left”
message heard in
mono intercom
installation for stereo headsets.
left ear only, no
audio heard in
right ear.
1) See a service center as soon as
“3D audio right” 1) Incorrect aircraft
message heard
wiring (right channel
possible to inspect/correct wiring.
in right ear only,
used for mono
This wiring fault can cause fail-safe
no audio heard in
instead of left, or
audio not to function.
left ear
left/right swapped)
3D Audio Troubleshooting
CLEARANCE RECORDER AND PLAYER
The GMA 342 contains a digital clearance recorder that records up to 60
seconds of the selected COM radio signal. Recorded COM audio is stored
in separate memory blocks. Once 60 seconds of recording time have been
reached, the recorder begins recording over the stored memory blocks,
starting from the oldest block.
Pressing the PLAY Key once plays the latest recorded memory block.
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Garmin GMA 342 Pilot’s Guide
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GMA 342 Audio Panel
Pressing the MKR/MUTE Key during play of a memory block stops play.
If a COM signal is detected during play of a recorded memory block, play is
halted.
Pressing the PLAY Key while audio is playing begins playing the previously
recorded memory block. Each subsequent press of the PLAY Key selects the
previously recorded memory block.
Powering off the unit automatically clears all recorded blocks.
PLAY Key
Stops Play
Left Knob - Pilot
Volume Controls
20
Marker Mute Key
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
ENTERTAINMENT INPUTS
The GMA 342 provides three stereo entertainment inputs and two telephone
inputs.
•
Press the MUSIC Key to turn music on/off for all positions. The
SEL Key selects the music source for all positions. The pilot can choose
not to hear music by either turning down the Pilot music volume or enabling
PILOT ‘ICS ISOLATION’. The copilot and passengers can choose not to hear
music by turning down the Copilot/Passenger music volume. Refer to the
following table on MUSIC and SEL Key Functions for more information.
•
The TEL Key controls a telephone or entertainment device connected
to the rear of the audio panel or to the Front Panel Jack. Distribution is
controlled by ICS isolation state. When the TEL Key is selected, the pilot
is always connected to the telephone interface. Other ICS positions are
connected to the telephone interface if they hear the Pilot in that ICS state.
Function
Action
Key Annunciations
Notes
Press the
Turn MUSIC MUSIC Key
ON
(when not
selected).
MUSIC in-key annunciator
turns green.
Press the
Turn MUSIC MUSIC
OFF
Key (when
selected).
MUSIC in-key annunciator
turns OFF (source selection
annunciators are unaffected).
Change
MUSIC
Source
Music source selection is
cyclic, moving from 1 to 2 to
3 and then back to 1.
Press the
SEL Key.
MUSIC andSEL Key Functions
190-01878-00 Rev. C
Garmin GMA 342 Pilot’s Guide
21
GMA 342 Audio Panel
FRONT PANEL JACK
The Front Panel Jack is a 3.5 mm stereo jack that can be used as an
entertainment input or a telephone input. When a telephone is connected
to the Front Panel Jack, the telephone connected to the rear of the audio
panel is disabled.
To use the Front Panel Jack as a music input, press the MUSIC Key and
use the SEL Key to select music source 3. To use as a telephone input,
press the TEL Key. The telephone function overrides the music function.
TEL must be enabled for intercom audio to be sent to the telephone device
MUSIC EFFECTS
The following music effects are available:
• Music Equalizer: Press the SEL Key and the PILOT Key simultaneously
to change the selected Music Equalizer setting. Available settings
include: Disabled, Classical, Pop, or Rock.
• Music Bass Boost: Press the SEL Key and the CREW Key
simultaneously to change the selected Music Bass Boost setting.
Available settings include: Disabled, Medium, or High.
22
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
GMA 342 Audio Panel
ENTERTAINMENT MUTING
Entertainment muting can be enabled or disabled by the user, however it
is always muted during alerts.
ENABLING/DISABLING MUTING
Press and hold the MUSIC Key for 1 second to toggle radio muting
of music on and off. The aural message “Radio Mute Music Enabled/
Disabled” is heard.
Press and hold the AUX2 button for one second to toggle intercom
muting of music on and off. The aural message “Intercom Mute Music
Enabled/Disabled” is heard.
190-01878-00 Rev. C
Garmin GMA 342 Pilot’s Guide
23
GMA 342 Audio Panel
FAIL-SAFE OPERATION
If there is a failure of the GMA 342 or when power is not applied, a fail-safe
circuit connects the pilot’s headset and microphone directly to the COM1
transceiver. Audio is not available on the speaker during Fail-safe operation.
Function
Monitor Mute
Key(s)
Action
or
Press and hold
for 1 second
Radio Mute
Intercom
Press and hold
for 1 second
Passenger Mute
Press and hold
for 1 second
Intercom
Mute Music
Press and hold
for 1 second
3D Audio
Press and hold
for 1 second
Passenger Address
Press and hold
for 1 second
Marker Beacon
High Sens
Press and hold
for 1 second
Split COM
Press keys
simultaneously
and
Music Equalizer
Music Bass Boost
and
and
Press keys
simultaneously
Press keys
simultaneously
Alternate Key Function Quick Reference
24
Garmin GMA 342 Pilot’s Guide
190-01878-00 Rev. C
Garmin International, Inc.
1200 East 151st Street
Olathe, Kansas, 66062, U.S.A.
Garmin AT Inc.
2345 Turner Road SE
Salem, OR 97302, U.S.A.
Garmin (Europe) Ltd.
Liberty House, Hounsdown Business Park
Southampton, Hampshire SO40 9LR U.K.
Garmin Corporation
No. 68, Zhangshu 2nd Road
Xizhi District, New Taipei City, Taiwan
Contact Garmin Product Support at www.flygarmin.com.
For warranty information refer to
https://fly.garmin.com/fly-garmin/support/warranty-information/
© 2016 - 2018 Garmin Ltd. or its subsidiaries
190-01878-00 Rev. C
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