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Old 11-19-2008, 06:28 PM   #1  
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Default CRJ700/900 audio system

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?
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Old 11-19-2008, 06:41 PM   #2  
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Does it have anything to do with the CVR? On the -200 there is a CB on that same row for the CVR itself, a well as the "audio pilot" CB, but perhaps it is related?
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Old 11-19-2008, 06:44 PM   #3  
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Wish I could help, I'll have to look tomorrow when I head back in. The only CB I have figured out so far is M5 for the reset of the lav call light....
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Old 11-19-2008, 06:45 PM   #4  
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Don't think so. FCOM says CVR only has 1 associated CB, down the line at 2V7. But it is not linked to the CVR, according to the FCOM
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Old 11-19-2008, 08:04 PM   #5  
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got your answer.... this breaker along with 1q6 (fo) provide power to the audio ctrl unit. pulling 2v2 should disable the ability to use pilot side audio functions.
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Old 11-20-2008, 09:10 AM   #6  
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Quote:
Originally Posted by cessna157 View Post
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
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