I would be grateful for any expert avionics view out there
on the question of the likely fault in my altitude
encoding on a Garmin GTX 328 transponder. This produces
entirely sensible altitude read outs as I climb to FL60
and then starts to show gently diminishing read outs as I
go higher, so may be reading something like FL50 when I
get to 10,000ft. There are 10 wires connecting encoder to
Transponder (or at least they should be connecting!).
Would you experts feel it is most likely that I have a
wiring fault or that I have a defective encoder? It has
done this since fitted new.
Regards, David Joyce G-XSDJ
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