Doug Rohrer
Well Known Member
I am posting this problem to see if any of the VAF brain trust can help steer me to the answer. I was flying on a two hour XC yesterday in my -9A (steam gauges) when I heard static in my headset. The amp gauge was bouncing peg-peg (+/- 40 amps). Voltage was constant at 14.2. I shut off the strobes; no change. Then I shut off the XLS 250 NavCom; no difference. I then switched off the alternator field; again, no change. Next I shut off the avionics switch, which stopped the bouncing amp gauge. After waiting several minutes, I switched the avionics back on, intending to turn off the Garmin 327 transponder, as this and the intercom are the only other devices on the avionics switch. However, the system was quiet and stayed that way all the way home. No smell, no smoke.
I am concerned that I had an intermittent short somewhere, causing the violent amp gauge movements and noise in the intercom. However, no CB's were tripped. I am not sure it was the transponder, as I could not reproduce the problem.
Anybody have any advice what could have happened? Is there anything I can do other than wait for it to happen again and resume troubleshooting in the air?
Thanks.
I am concerned that I had an intermittent short somewhere, causing the violent amp gauge movements and noise in the intercom. However, no CB's were tripped. I am not sure it was the transponder, as I could not reproduce the problem.
Anybody have any advice what could have happened? Is there anything I can do other than wait for it to happen again and resume troubleshooting in the air?
Thanks.