Garmin GMA 350H (Helicopter)

The first truly all-digital audio panel, the GMA 350H introduces a number of new technologies to the helicopter cockpit, including Telligence™ Voice Command, 3-D audio processing and advanced auto squelch.

SKU: 010-00871-31 Categories: , ,


Listen in Virtual 3-D


Advanced processing in the GMA 350H adjusts audio in the headset to mimic how the human ear normally hears and registers sounds in space. 3-D Audio makes it seem like different audio sources are coming from different directions, making it easier to distinguish one source from many. For example, COMM 1 will seem like it’s coming from the left while COMM 2 will seem like it’s coming from the right.

Operate Hands Free

With built-in Telligence Voice Command, the GMA 350H helps decrease pilot workload. Operate your audio panel without taking your hands off the controls. To switch between COMMs, just press a button and say “MIC 1” or “MIC 2.”

Distribute Audio in the Cockpit

The GMA 350H makes in-flight entertainment easy. Permanently wire 2 dedicated input sources into the rear connectors, such as an XM receiver and an auxiliary music device. Plug your portable audio devices (such as MP3 players or mobile phones) into the 3.5 mm jack on the front. Control which headset positions have access to which audio sources with the “blue-select” mode so your passengers can enjoy music while you listen to radio communications or make private full-duplex telephone calls. The intuitive front panel layout features cursor control and volume indicator for easy operation.

Advanced Auto Squelch & Automatic Volume Control

Advanced Auto Squelch automatically adapts to a quiet or noisy cockpit without clipping words or cutting out in the middle of phrases. An internal microphone also senses ambient noise and adjusts the cockpit speaker volume level accordingly. The system analyzes ambient noise level and adjusts volumes for the headsets (when configured to do so at the time of installation).

Advanced Features

The GMA 350H offers 3 COMM support, as well as a flexible split COMM mode that lets the pilot and copilot to broadcast on separate COMMs. Split COMM support is available for positions 1/2, 1/3 or 2/3.

The system’s green lighting is compatible with night-vision goggles. The automatic digital voice recorder continuously captures the last 2.5 minutes of audio for playback, so you can go back and listen if you miss an ATC call or frequency assignment.

Hands-free Convenience

The GMA 350Hc offers all the technology of the GMA 350H audio panel and adds the convenience of Bluetooth® wireless connectivity with your mobile and compatible portable devices, so you can distribute music or telephone audio through your aircraft audio panel wirelessly. And, with the VIRB® XE Aviation Bundle, Bluetooth works in place of a headset audio cable to overlay cockpit audio, such as radio and intercom, onto your video.



Physical dimensions 6.25”W x 1.30”H x 7.80”D (15.9 x 3.3 x 19.8 cm)
Weight 2.4 lb (1.1 kg)

Audio Panel Features

Telephone interface dedicated full-duplex tel interface (no PTT keying required)
ICS (intercom system) 6 to 7 position intercom (individual VOX processing for each mic position)
ICS isolation modes 5 – All, Pilot, CoPilot, Crew/Pass, None
Transceivers 3 – COM1, COM2, COM3
Additional receiver inputs 5 – NAV1, NAV2, AUX1, AUX2, AUX3
Music source input 1 stereo music source input
Music input impedance rear pins: 600 Ohms; front panel jack: 5 kOhms
Music frequency response 20Hz – 20kHz
Speaker output 28V aircraft — 10W into 4 Ohms, 7W into 8 Ohms; 14V aircraft — 3W into 4 Ohms
PA function pilot selectable — requires pressing and holding SPKR button to change state
Marker beacon dual sensitivity
Manual squelch
Automatic squelch
SmartMute (includes SmartMute marker audio muting)
Intercom volume controls
Manual VOX level controls 1 (shared threshold, individual processing)
Avionics squelch (squelch processing for noise reduction)
Failsafe (connects Pilot PTT, mic and headset to COM1 if unit is turned off)
Clearance recorder
Split com (CoPilot transmits and receives on Com2 while Pilot transmits and receives on Com1)
Alert/Unswitched inputs 5
Front panel jack yes (3.5mm – smartphone compatible)
Front panel music volume control yes (music and telephone volume controls)
TSO Authorization


Additional includes marker, AUX and speaker volume controls; also features 3D spatial audio and automatic speech recognition.



  • Intuitive front panel layout with cursor control and volume indicator
  • 6 to 7 position intercom: pilot, copilot, or 4 or 5 passengers
  • 3 stereo headset amplifiers: pilot, copilot and passengers
  • 2 stereo music source inputs
  • 5 selectable intercom operational modes
  • Independent pilot, copilot and passenger volume controls
  • Individual VOX processing for each mic input
  • Automatic selection of radio audio source when corresponding mic is selected
  • Flexible split COMM transceiver function. Copilot may transmit and receive on one COMM while pilot transmits and receives on another.
  • Voice recognition
  • Automatic audio adjustment for ambient noise
  • 3-D Audio
  • Marker beacon receiver with lamp driver outputs

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