Originally Posted by
cessna157
Okay folks, here's a head scratcher for you. I've asked captains, check airmen, and some maintenance folks, and haven't gotten an answer.
Circuit breaker 2V2, on the DC Essential bus, behind the F/Os flight case, is a 5 amp circuit breaker called "AUDIO PILOT"
This breaker is part of the audio system but not in the audio/visual indicating system (not the DCU power), and does not control the capt, f/o, and ovserver panel.
Anyone know what this is?
Looks like it powers both the CA & FO audio from the DC
ESS Bus. (2V2)
CB's 1Q6 (CA) & 1Q7 (FO) power associated audio from the
BATT Bus. In theory you would have to lose both busses to lose CA & FO audio power.
The observer audio has two breakers as well: 2H4 & 1Q8