We just had the pitot-static, encoder / transponder certification completed
on 2/21. On 2/23 ATC repeatedly failed to receive the mode-c. Recycling
didn't seem to help. What exactly did the shop "certify" when they
certified the xponder/encoder? Was it the encoder calibration?

BTW this has been a problem in the past too, so whatever they did didn't
cause the problem but it didn't fix it or find it either.

Eddie


"Ray Bengen" wrote in message
...
What can make my xponder only give out mode-a and only mode-c
intermittenly.

Thanx in advance.

Ray