GNC 355

2nd505th

Pre-takeoff checklist
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Apr 11, 2018
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2nd505th
Looking for someone with wiring experience.
Assumptions:
1) The Radio portion cannot connect up to an overhead 8 ohm speaker.
2) Pin 7 of port P3552 essentially goes to my headset via the Audio Control Panel (ACP)?
3) My ACP does not have a Audio LO input. So what do I do with pin 18 on port P3552. Do I ground it or only loop it to port 18 and is port 18 really Headset sidetone input?

The wiring guide is here, please look at page 108:
http://www.accelerationtech.com/photos/mooney/2652W/GNC-355/190-02207-A5_01.pdf

I know this question really is for Garmin support but maybe I'll get better answers here.
 
You would hook your speaker to your audio panel, not the gnc.
 
Pin 18 would get grounded. It was a common occurrence longer ago for the aircraft to be used as part of the circuit.
 
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