A340 APU Start Limit

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24th April 2006 | 03:10

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BMM389EC

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Joined: Jul 2001

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From: Down South

A340 APU Start Limit

Hello All
Any idea why the A340-300s APU is limited to 25 000ft when starting on batteries?
Cheers

24th April 2006 | 03:26

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vapilot2004

Joined: Aug 2005

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From: fairly close to the colonial capitol

Not a 340 expert by any means, but I would imagine the batteries may not have enough oomph for the longer and colder start above 25,000

cheers !

26th April 2006 | 05:06

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H Peacock

Joined: Sep 2004

Posts: 613

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From: 11A

May be a bit of a red herring, but I know lots of aircraft that have an altitude limit for starting/relighting. I therefore suspect that above 25000ft the APU may be reluctant to start, or possibly overtemp.

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