Originally Posted by DavidFrangos
I am in the process of adding a garmin gtp 59 oat probe on a composite aircraft. The g3x manual states it needs to be mounted where there is significant wire mesh in the airframe.
I planned to I stall it next to the wheel well but the structure is only composite. Does it need a metal plate? Or a ground plane? Or can I drill a hole and install it directly through the fiberglass?
Section 21.3 is the relevant section of the G3X Touch Installation Manual in this case. We advise against mounting the GTP 59 in fiberglass only, in your case you will want to make use of a metal doubler, to address lightning concerns.