Copyright D.P. Browne 2011

 

 

 

 

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APU operating limits (A330)

 

 

The APU may be used for bleed air up to to 17,500 ft maximum for 2 air conditioning packs operation

 

 

 

 

 

17,500 ft

 

 

 

The APU may restarted using batteries only up to 25,000 ft

 

 

 

 

22,500 ft

 

 

 

25,000 ft

 

 

 

37,000 ft

 

 

 

41,100 ft

 

 

 

The APU may be used for bleed air up to to 22,500 ft  for 1 air conditioning pack operation

 

 

 

 

The APU may restarted using aircraft power up to 37,000 ft

 

 

 

 

The operation limit of the APU for electrical supply is at the aircraft operating ceiling of 41,100 ft

 

 

 

 

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Indications

Abnormal indications

 

OIL LO LEVEL

 

FUEL LO PR

 

An indication of Oil low quantity may appear if the oil level becomes too low. A maintenance message may also appear in the System Display Status page prior to engine start.
 

 

 

 

 

There are no flight crew actions to elevate the OIL LO LEVEL message, actions will be carried by maintenance personnel. Further use of the APU will be a mater of airline procedures.
 

 

 

 

 

Fuel Low pressure occurs when the fuel flow pressure becomes to little. It may be possible to boost the fuel pressure by selecting ground power and ensuring all fuel pumps are powered and no refueling is taking place. Even though the message is in amber it is still an advisory message