I have an RV-7 with dual Garmin ADHRS and dual G3X screens. The PFD (ADHRS 1) and MFD (ADHRS 2) are on separate busses, the PFD can be powered from normal ships power or one or both batteries (Main and backup).
I noticed that when I pull the CB for ADHRS 1, I loose the transponder, and the avionics shop did not wire a switch to allow the transponder to receive information from ADHRS 2. Not a good thing when in the clouds and have a system loss. I see many aircraft wired the same way. I wired in a TPDT mini switch, labeled it:
TXP ADHRS 1/TXP ADHRS 2 per the following diagram. Now with redundant transponder serial, I feel more confident when inside the milk bottle.
Regards,
Gary
I noticed that when I pull the CB for ADHRS 1, I loose the transponder, and the avionics shop did not wire a switch to allow the transponder to receive information from ADHRS 2. Not a good thing when in the clouds and have a system loss. I see many aircraft wired the same way. I wired in a TPDT mini switch, labeled it:
TXP ADHRS 1/TXP ADHRS 2 per the following diagram. Now with redundant transponder serial, I feel more confident when inside the milk bottle.
Regards,
Gary