A319\20\21 PACK'S OPERATION
A319\20\21 PACK'S OPERATION
Join Date: Jan 1999
Location: hongkong
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My understanding is that it depends on wether you have just started the engine/s. There will be a delay on the pack opening post engine start but not if one has just turned off the packs for say a walkaround.
Join Date: Jan 2001
Location: Sweden
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Theres no built in delay, but the apu pressure is normally a bit lower than engine air pressure, so the valves operate a bit slower. If you try to select crossbleed ´closed` and just switch on the left pack you will find that it opens almost as fast as with engine air.. .Brgds. .Doc
