Garmin GMA 350 User Manual

GMA 350

pilot’s guide

Copyright © 2011 Garmin Ltd. or its subsidiaries. All rights reserved.

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.

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Garmin AT, Inc., 2345 Turner Road SE, Salem, OR 97302, U.S.A.
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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 LIEU OFALL OTHERWARRANTIES EXPRESS OR IMPLIED OR STATUTORY,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 Garmin Web 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.

GMA 350 Audio Panel

CONTROLS

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

GMA 350 Controls

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

1MKR/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.

2COM1 – When selected, audio from the #1 COM receiver can be heard. Press and hold to enable/disable monitored COM muting during primary COM reception.

3COM2 – When selected, audio from the #2 COM receiver can be heard. Press and hold to enable/disable monitored COM muting during primary COM reception.

4NAV1 – When selected, audio from the #1 NAV receiver can be heard.

5NAV2 – When selected, audio from the #2 NAV receiver can be heard.

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		GMA 350 Audio Panel
6	– 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.

7MUS1 – Selects and deselects music entertainment audio. Press and hold to enable/disable MUS1 muting during reception.

8MUS2 – Selects and deselects music entertainment audio. Press and hold to enable/disable MUS2 muting during reception.

9MAN SQ – Manual Squelch annunciator. When lit, squelch is controlled manually.

10Volume Indicator – Indicates volume/squelch setting relative to full scale.

11Front Panel Jack – Used for an entertainment or telephone input.

12MIC1 – 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.

13MIC2 – 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.

14PLAY – 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.

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GMA 350 Audio Panel

15AUX – When selected, audio from the AUX inputs can be heard.

16PILOT – Controls the pilot intercom system. Press and hold to toggle 3D Audio on/off for all headset positions.

17COPLT – Controls the copilot intercom system. Press and hold to toggle copilot configuration between crew and passenger.

18PASS – Controls the passenger intercom system. Press and hold to enable/disable passenger muting during reception.

19SPKR – 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.

20Cursor (CRSR) Control Knob – Turn to move the cursor (flashing white or blue annunciator) to the desired source.

21Volume (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 BlueSelect mode).

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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 selftest 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.

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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 the Voice 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.

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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

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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.

Annunciator

Flashes During

Transmission

COM Radio Transmit Indication

RECEIVERS

NOTE: Receiver functions may also be accessed via Voice Recognition commands. Refer to the Voice 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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