Yesterday while flying smelled something burning, then saw smoke. Turning off the master solved the smoke problem.
At home-based we noticed the 5 amp over voltage relay (OVR) circuit breaker (CB) kept popping. We isolated the the wires going to OVR CB. One popped all the time. The other wires were fine. Traced wire to Inter Av OVR. Red wire was shorting inside the relay. Removed OV relay and could see where it was melting on the airframe.
Oddly, removed the other working relay that was not popping the CB (yet) and could see where a piece had broken off and that it would eventually fail. See photo.
We are stumped why both separate relays would be burning out and not tripping, causing the CB to have to do the tripping.
We put another one on one engine and started it up. It worked for 3 minutes before cutting out and not allowing any more charging. Now it could be a bad OVR, as it was used, or it could be saying there is another problem elsewhere in the system past the OVR to the alternator or battery. Whatever is happening applies to both separate sides. The OVR is P/N 635-62448. Any sources for this part? Other thoughts. Thanks. Tom.
At home-based we noticed the 5 amp over voltage relay (OVR) circuit breaker (CB) kept popping. We isolated the the wires going to OVR CB. One popped all the time. The other wires were fine. Traced wire to Inter Av OVR. Red wire was shorting inside the relay. Removed OV relay and could see where it was melting on the airframe.
Oddly, removed the other working relay that was not popping the CB (yet) and could see where a piece had broken off and that it would eventually fail. See photo.
We are stumped why both separate relays would be burning out and not tripping, causing the CB to have to do the tripping.
We put another one on one engine and started it up. It worked for 3 minutes before cutting out and not allowing any more charging. Now it could be a bad OVR, as it was used, or it could be saying there is another problem elsewhere in the system past the OVR to the alternator or battery. Whatever is happening applies to both separate sides. The OVR is P/N 635-62448. Any sources for this part? Other thoughts. Thanks. Tom.
