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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 1-5
1.4.1.2 GTN 6XX Series Description
The GTN 6XX WAAS navigators are a family of panel-mounted products that supersede the 400W series
GPS/NAV/COM navigators. The GTN 6XX series units include the GTN 625, GTN 635, and GTN 650.
They are 6.25 inches wide and 2.65 inches tall. The GTN 6XX features a 600 by 266 pixel color LCD
touchscreen. The GTN 625 is a GPS/SBAS unit that meets the requirements of Technical Standard Order
(TSO)-C146c and may be approved for IFR en route, terminal, Oceanic, non-precision, and precision
approach operations when installed in accordance with the instructions in the manuals referenced in the
GTN AML STC. The GTN 635 includes all of the features of the GTN 625 in addition to an airborne
VHF communications transceiver. The GTN 650 includes all of the features of the GTN 625 in addition
to an airborne VHF communications transceiver and airborne VOR/localizer (LOC) and glideslope (G/S)
receivers.
1.4.2 GMA 35 Audio Panel Description (Optional)
The GMA 35 is a remote mounted audio panel that interfaces via RS-232 to the GTN 7XX for control and
display of audio panel functions. The system delivers reliability and versatility for all audio controlling
functions. The GMA 35 can be optionally installed with the GTN 7XX. With the increased size of the
GTN 7XX over the previous 500W series GPS/SBAS navigator, the 7XX has the option of incorporating
the audio panel into a much more intuitive touch-screen interface.
Additionally, the GMA 35 includes a six-position intercom system (ICS) with electronic cabin noise de-
emphasis, two stereo music inputs, and independent pilot, copilot, and passenger volume controls. To
further simplify cockpit workload, the intercom provides three selectable isolation modes. A pilot-
selectable cabin speaker output can be used to listen to the selected aircraft radios or to broadcast PA
announcements.
The GMA 35 also includes a marker beacon receiver with dual sensitivity and audio muting with
automatic re-arming.
Features Summary
User-friendly, intuitive control via the GTN 7XX touchscreen navigator
Six position intercom: pilot, copilot, and four passengers
3D Audio
Three stereo headset amplifiers: one for pilot, one for copilot, and one for the passengers
Two stereo music source inputs
Three selectable intercom operational modes
Independent pilot, copilot, and passenger volume controls
Individual VOX circuits for each of six (6) mic inputs
Automatic selection of radio audio source when corresponding mic is selected
Split COM transceiver function. Copilot may transmit and receive on COM2 while pilot transmits
and receives on COM1
COM swap function
TX indication via GTN 7XX
Speaker output for radios or PA function
Power-off fail-safe to connect Pilot PTT, mic, and Headset to COM1 if unit is turned off or loses
power
Power loss fail-safe warning audio
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