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A320 APU Startup Time  
User currently offlineNmeier23 From Germany, joined Jan 2009, 7 posts, RR: 0
Posted (4 years 9 months 3 days 22 hours ago) and read 5068 times:

Hi all,

Could anyone tell me what the startup time for an A320 APU is?

Couldn't find anything searching.


Thanks!
NM

7 replies: All unread, jump to last
 
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 1, posted (4 years 9 months 3 days 17 hours ago) and read 4997 times:

Most all APU's are running within 30-45 seconds...


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineKimberlyrj From United Kingdom, joined Mar 2008, 385 posts, RR: 1
Reply 2, posted (4 years 9 months 1 day 19 hours ago) and read 4610 times:

Is it not good practice to allow the APU to run for a few minutes before it starts powering the aircraft etc, and on the other hand, when the engines are started (and powering the aircraft) is it not good practice to leave the APU on for a few minutes – I am sure I heard this was done in connection with the reduction of ware on the APU unit and its components?

Kimberly


User currently offlineDALMD88 From United States of America, joined Jul 2000, 2582 posts, RR: 14
Reply 3, posted (4 years 9 months 1 day 18 hours ago) and read 4603 times:



Quoting Kimberlyrj (Reply 2):
Is it not good practice to allow the APU to run for a few minutes before it starts powering the aircraft etc, and on the other hand, when the engines are started (and powering the aircraft) is it not good practice to leave the APU on for a few minutes – I am sure I heard this was done in connection with the reduction of ware on the APU unit and its components?

Usually the apu gen comes online as soon as the apu is running stable. As for pnumatics as soon as the pressure is up you can open the valve. For shutdown I let the temp stablize after shutting off the air and then select off. The apu goes through a cooldown cycle all by it's self.


User currently offlineCanadianNorth From Canada, joined Aug 2002, 3390 posts, RR: 9
Reply 4, posted (4 years 9 months 1 day 14 hours ago) and read 4558 times:

Not sure about the APU on the A320, but I can't see it being overly different from our 737s. On the 737 APU everything can work pretty much immediately after startup (startup takes probably about a minute or so, if that), but just as a work habit I usually let it run for a minute or two before I start turning things on, and then again on shutdown if it was doing anything more than just providing some electrical power then I'll turn off the pack or whatever, then give it a few minutes for the EGT to come down and settle out, then shut it down.



CanadianNorth



What could possibly go wrong?
User currently offlineFlyinTLow From Germany, joined Oct 2004, 524 posts, RR: 0
Reply 5, posted (4 years 9 months 1 day ago) and read 4479 times:

Depends whether the APU opening flap is open or not. This takes around 15 seconds to open it up. After that, the startup itsself takes around 30 to 45 seconds, as said before.

Quoting DALMD88 (Reply 3):

Usually the apu gen comes online as soon as the apu is running stable. As for pnumatics as soon as the pressure is up you can open the valve. For shutdown I let the temp stablize after shutting off the air and then select off. The apu goes through a cooldown cycle all by it's self.

On the A320, the GEN is on as soon as the APU is running, but it is not connected to the aircrafts electrical system yet. On the A320, the engine and external power have a higher priority than the APU Gen, so whenever one engine is running or the External Power is selected on, it is used instead of the APU.



- When dreams take flight, follow them -
User currently offlineLHRjc From Netherlands, joined Apr 2006, 1964 posts, RR: 20
Reply 6, posted (4 years 9 months 14 hours ago) and read 4425 times:



Quoting FlyinTLow (Reply 5):
On the A320, the GEN is on as soon as the APU is running, but it is not connected to the aircrafts electrical system yet.

The only exception being if you start the APU from batteries without any external power, in which case as soon as the APU becomes available it will automatically power the aircraft's sytems up without any intervention.



"Our 319's are very reliable. They get fixed very quickly."
User currently offlinewing From Turkey, joined Oct 2000, 1573 posts, RR: 24
Reply 7, posted (4 years 8 months 3 weeks 4 days 3 hours ago) and read 4136 times:

A320 APU starts in aprox. 1 mins.


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