Garmin GMA 350 Manual

GMA 350

pilot’s guide

This manual reﬂects the operation of GMA 350 units with mod level 0 or later.

Some differences in operation may be observed when comparing the information

in this manual to earlier or later Mod status levels.

Garmin International, Inc., 1200 East 151st Street, Olathe, Kansas 66062, U.S.A.

Tel: 913/397.8200 Fax: 913/397.8282

Garmin AT, Inc., 2345 Turner Road SE, Salem, OR 97302, U.S.A.

Tel: 503/391.3411 Fax 503/364.2138

Garmin (Europe) Ltd, Liberty House, Bulls Copse Road, Hounsdown Business Park,

Southampton, SO40 9RB, U.K.

Tel: 44/0870.8501241 Fax: 44/0870.8501251

Garmin Corporation, No. 68, Jangshu 2nd Road, Shijr, Taipei County, Taiwan

Tel: 886/02.2642.9199 Fax: 886/02.2642.9099

Web Site Address: www.garmin.com

Except as expressly provided herein, no part of this manual may be reproduced,

copied, transmitted, disseminated, downloaded or stored in any storage medium,

for any purpose without the express written permission of Garmin. Garmin hereby

grants permission to download a single copy of this manual and of any revision to

this manual onto a hard drive or other electronic storage medium to be viewed for

personal use, provided that such electronic or printed copy of this manual or revision

must contain the complete text of this copyright notice and provided further that

any unauthorized commercial distribution of this manual or any revision hereto is

strictly prohibited.

Garmin

is a registered trademark of Garmin Ltd. or its subsidiaries. These

trademarks may not be used without the express permission of Garmin.

September, 2011 190-01134-12 Rev. D Printed in the U.S.A.

LIMITED WARRANTY

This Garmin product is warranted to be free from defects in materials or

workmanship for two years from the date of purchase. Within this 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

and labor, provided that the customer shall be responsible for any transportation

cost. This warranty does not cover failures due to abuse, misuse, accident, or

unauthorized alterations or repairs. In addition, Garmin reserves the right to

refuse warranty claims against products or services that are obtained and/or used

in contravention of the law of any country.

THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN

LIEUOFALLOTHERWARRANTIESEXPRESSORIMPLIEDORSTATUTORY,INCLUDING

ANY LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS

WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE

TO STATE.

IN NO EVENT SHALL GARMIN BE LIABLE FORANY INCIDENTAL,SPECIAL,INDIRECT

OR CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE,

OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some

states do not allow the exclusion of incidental or consequential damages, so the

above limitations may not apply to you.

Garmin retains the exclusive right to repair or replace the unit or software, or to

offer a full refund of the purchase price, at its sole discretion. SUCH REMEDY SHALL

BE YOUR SOLE AND EXCLUSIVE REMEDY FOR ANY BREACH OF WARRANTY.

To obtain warranty service, contact your local GarminAuthorized Service Center. For

assistance in locating a Service Center near you, visit the GarminWeb site at“http://

www.garmin.com” or contact Garmin Customer Service at 800-800-1020.

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.

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

CONTROLS

GMA 350 Controls

14 15 1712 1311 19 20

1816

8642 3 5 7 9

NOTE: When a key is selected, a triangular annunciator above the key is

illuminated.

MKR/MUTE

– Selects marker beacon receiver audio. Mutes the

currently received marker beacon receiver audio. Deactivates

automatically and marker beacon audio is heard when the next marker

beacon signal is received. Also, stops play of recorded COM audio.

COM1

– When selected, audio from the #1 COM receiver can be

heard. Press and hold to enable/disable monitored COM muting

during primary COM reception.

COM2

– When selected, audio from the #2 COM receiver can be

heard. Press and hold to enable/disable monitored COM muting

during primary COM reception.

NAV1

– When selected, audio from the #1 NAV receiver can be heard.

NAV2

– When selected, audio from the #2 NAV receiver can be heard.

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

– Selects and deselects audio from a telephone or entertainment

device connected to the Front Panel Jack. Audio from a telephone

connected to the rear of the audio panel is used if a device is not

connected to the Front Panel Jack. Press and hold to enable/disable

muting during reception.

MUS1

– Selects and deselects music entertainment audio. Press and

hold to enable/disable MUS1 muting during reception.

MUS2

– Selects and deselects music entertainment audio. Press and

hold to enable/disable MUS2 muting during reception.

MAN SQ – Manual Squelch annunciator. When lit, squelch is

controlled manually.

Volume Indicator

– Indicates volume/squelch setting relative to full

scale.

Front Panel Jack

– Used for an entertainment or telephone input.

MIC1

– Selects the #1 transmitter for transmitting. COM1 receive

is simultaneously selected when this key is pressed allowing received

audio from the #1 COM receiver to be heard. COM2 receive can be

added by pressing the COM2 Key. Selection of a second MIC button

initiates Split-COM mode. When in Split-COM mode, the pilot is

using COM1, the copilot is using the COM2.

MIC2

– Selects the #2 transmitter for transmitting. COM2 receive

is simultaneously selected when this key is pressed allowing received

audio from the #2 COM receiver to be heard. COM1 receive can be

added by pressing the COM1 Key. Selection of a second MIC button

initiates Split-COM mode. When in Split-COM mode, the pilot is

using COM1, the copilot is using the COM2.

PLAY

– Press once to play the latest recorded memory block. Press

while audio is playing begins playing the previously recorded memory

block. Each subsequent press thereafter plays the previous block of

memory.

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

AUX

– When selected, audio from the AUX inputs can be heard.

PILOT

– Controls the pilot intercom system. Press and hold to toggle

3D Audio on/off for all headset positions.

COPLT

– Controls the copilot intercom system. Press and hold to

toggle copilot conﬁguration between crew and passenger.

PASS

– Controls the passenger intercom system. Press and hold to

enable/disable passenger muting during reception.

SPKR

– Selects and deselects the cabin speaker. COM, NAV, AUX, and

MKR receiver audio can be heard on the speaker. Press and hold for 2

seconds for Passenger Address (PA). The SPKR key ﬂashes during PA.

Cursor (CRSR) Control Knob

– Turn to move the cursor (ﬂashing

white or blue annunciator) to the desired source.

Volume (VOL) Control Knob

– Turn the smaller knob to control

volume or squelch of the selected source (indicated by the ﬂashing

white or blue annunciator). When the volume control cursor is not

active press to switch to Blue-Select mode. If the volume control cursor

is active, press twice (once to cancel the cursor, twice to activate Blue-

Select mode).

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

FEATURES AND OPERATION

The GMA 350 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, and a COM clearance

recorder. 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. The MAN SQ Key toggles between manual

and automatic intercom system (ICS) squelch. In automatic ICS squelch

mode, threshold adjustments are handled automatically by the system. In

manual ICS squelch mode, individual threshold adjustments can be made

for the pilot, copilot, and passenger microphones by the crew. The ability to

adjust individual thresholds for each ICS position further reduces the amount

of background noise from the radios.

Pushbutton keys control audio selection. When a key is selected, a triangular

annunciator above 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.

POWER-UP

The GMA 350 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.

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

MONO/STEREO HEADSETS

Stereo headsets are recommended when using the GMA 350. 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.

TRANSCEIVERS

NOTE: Transceiver functions may also be accessed via Voice Recognition

commands. Refer to theVoice Recognition section for more information.

Audio from the #1 or #2 COM receiver can be selected independently by

pressing the respective Key(s) (COM1 or COM2).

Pressing MIC1 or MIC2 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. During reception of audio from the COM radio selected for

transmission, audio from the other COM radio is muted.

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.

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

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.

Pressing both MIC Keys simultaneously initiates Split-COM Mode

(i.e., COM1/COM2). The respective COM1/MIC1 or COM2/MIC2

annunciators are illuminated indicating Split-COM operation. Split-COM

operation is cancelled by pressing one of the selected MIC Keys again.

In Split-COM mode, the pilot is uses COM1 and the copilot is uses

COM2.

COM2 Radio is Selected

Selecting a COM Radio for Transmit

190-01134-12 Rev. D

Garmin GMA 350 Pilot’s Guide

GMA 350 Audio Panel

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.

COM Radio Transmit Indication

Annunciator

Flashes During

Transmission

RECEIVERS

NOTE: Receiver functions may also be accessed via Voice Recognition

commands. Refer to theVoice Recognition section for more information.

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

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