A320 APU
Thread Starter
Joined: Nov 2006
Posts: 367
Likes: 0
From: Tropics
Togue, we tried it in the aircraft. With the APU running, we turned off the batteries and had a look at the ECAM ELEC page, where it shows the DC BAT BUS in crosses. STATUS page shows APU BAT START NOT AVAIL. APU FIRE DET was not part of the inop system as I would have expected similar to the DC BAT BUS FAULT.
Stone, The ADIRS were on when we tried it out. Aircraft was in transit.
Stone, The ADIRS were on when we tried it out. Aircraft was in transit.
Only half a speed-brake
Joined: Apr 2003
Posts: 4,459
Likes: 136
From: Commuting not home
Can you check this section of FCOM for the A/C you were sat in? What does it say about the crosses?
because mine says nothing:
(3) DC BAT indication
It is normally in green. It becomes amber, if DC BAT voltage ≤ 25 V.
because mine says nothing:
(3) DC BAT indication
It is normally in green. It becomes amber, if DC BAT voltage ≤ 25 V.
Joined: Jun 2007
Posts: 3,443
Likes: 39
From: Wanderlust
I myself wrote this to earlier query on the same subject on 12/12/2014 now I remember.
Different APUs are fitted depending upon MSN of the aircraft. I am giving below from FCOM. However my experience is APU auto shuts down with batteries off,
Applicable to: MSN 0185-0249, 0264, 0384-0400, 0724
The APU may obtain power for starting from the aircraft's batteries or normal electrical system, or from ground service.
Applicable to: MSN 0138-0148, 0138-0148,0148- 0255, 0148- 0255, 0497-0557, 0932-0943
The APU may obtain power for starting from the aircraft's batteries alone or in combination with the external power, or from ground service.
Applicable to: MSN 0250, 0301-0335, 0440, 0758, 0976-1818
The APU may obtain power for starting from the aircraft's batteries or normal electrical system, or from ground service
Different APUs are fitted depending upon MSN of the aircraft. I am giving below from FCOM. However my experience is APU auto shuts down with batteries off,
Applicable to: MSN 0185-0249, 0264, 0384-0400, 0724
The APU may obtain power for starting from the aircraft's batteries or normal electrical system, or from ground service.
Applicable to: MSN 0138-0148, 0138-0148,0148- 0255, 0148- 0255, 0497-0557, 0932-0943
The APU may obtain power for starting from the aircraft's batteries alone or in combination with the external power, or from ground service.
Applicable to: MSN 0250, 0301-0335, 0440, 0758, 0976-1818
The APU may obtain power for starting from the aircraft's batteries or normal electrical system, or from ground service
Thread Starter
Joined: Nov 2006
Posts: 367
Likes: 0
From: Tropics
Had the opportunity to secure our aircraft today and we tried once again putting the batteries off while the APU is running, and it doesn't shut down.
External power was connected and we put the batteries back on and shut down the APU, and turned off the batteries while the APU flap was still indicated open. We monitored it and it closed eventually.
MSN 5xxxx aircraft.
External power was connected and we put the batteries back on and shut down the APU, and turned off the batteries while the APU flap was still indicated open. We monitored it and it closed eventually.
MSN 5xxxx aircraft.
