Essential Bus -- Audio Panel

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waynemcc999
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Essential Bus -- Audio Panel

Post by waynemcc999 »

2008 DA40 XLS G1000 WAAS

When switched to Essential Bus (e.g. upon Alternator failure)... what aspects of the Audio Panel work and don't work? Assumptions of this novice:
  • Intercom works
  • Com1 works (both Mic and Monitor)
  • Com2 Mic and Monitor do not work
  • Nothing else on the audio panel works
Appreciate your help,
Wayne
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ellisr
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Re: Essential Bus -- Audio Panel

Post by ellisr »

„Essential Bus Powers:-
„ PFD
„ Horizon
„ AHRS
„ ADC
„ Flaps
„ Landing light
„ Pitot Heating
„ Landing Light
„ Flood Light
„ COM 1
„ GPS / NAV Receiver 1
„ Transponder
„ Engine instruments

And the Emergency Battery (the red guarded switch) will power:-
Backup Horizon and Flood light
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waynemcc999
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Re: Essential Bus -- Audio Panel

Post by waynemcc999 »

Thanks, Russ, for your response. I had known the list you provided, per:
https://drive.google.com/file/d/0B5Ju85 ... VqTHM/view

... but I'm looking for more detail on what specifically on the Audio Panel works and doesn't... e.g. it's not clear from the Supplement whether the Intercom continues to work or not.
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Rich
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Re: Essential Bus -- Audio Panel

Post by Rich »

For us old-timey steam-gauge types with the 340 audio panel, the intercom should work because:

1. The intercom is entirely driven by the 340
2. There is only one power lead to the 340, so it has no way to detect whether it's on essential bus or not.

Marker beacons (as useless as they have now become) should also work for the same reason.

Anything that depends on an external module that is NOT powered by the ess. bus (such as nav/com 2) won't work.

I suspect it's the same for the G1000 planes, also. For the same reasons.
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Re: Essential Bus -- Audio Panel

Post by RC7 »

Intercom does not work. Only pilot side mic mic will work and only on comm 1. I know this from personal experience. Just try it out next time you fly.
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waynemcc999
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Re: Essential Bus -- Audio Panel

Post by waynemcc999 »

Thx, Ben. Just what I was looking for. I've been reluctant during flight to turn Master Off and Essential Bus On.
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Re: Essential Bus -- Audio Panel

Post by RC7 »

waynemcc999 wrote:Thx, Ben. Just what I was looking for. I've been reluctant during flight to turn Master Off and Essential Bus On.
No problem. Actually you don't even have to turn off the master switch. Hitting the ESS bus will disconnect all of the other stuff anyway. If you don't want to try it in flight, then give it a try while on the ground :thumbsup:
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Re: Essential Bus -- Audio Panel

Post by Rich »

Mystery solved. The audio panel isn't ON the essential bus at all. But it has a no-power mode that lets the pilot use Nav/Comm1 when there is no power to the audio panel. It just becomes a passive device between the two.
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Re: Essential Bus -- Audio Panel

Post by waynemcc999 »

Rich, thanks for helping figure this out.
Wayne
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