A320 Startup
Join Date: Apr 2006
Location: Front right seat
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Packs: No. Start valves are not supplied by the packs.
Fuel Pumps: SOP requires Fuel pumps to be on. I've started a B727 with them off (by mistake), but there is no reason to find out if this is possible.
Fuel Pumps: SOP requires Fuel pumps to be on. I've started a B727 with them off (by mistake), but there is no reason to find out if this is possible.
Join Date: May 2005
Location: England
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I would recommend the fuel pumps on - saying that the gravity feeding system might be able to handle it.......
As for the packs the computer deals with the air supply, so you can have them on (not working), or off doing nothing (i think).
B
As for the packs the computer deals with the air supply, so you can have them on (not working), or off doing nothing (i think).
B
Dog Tired
Don't get confused. If you are sitting ready for start with APU bleed on and both packs on (as you normally would) when you select eng mode selector to START, both packs turn off automatically.
Join Date: Apr 2008
Location: Somewhere
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Would the start also be possible with APU on but the APU BLEED button switched off? Would it engage automatically?
Join Date: Jul 2007
Location: taking up the hold
Age: 53
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Fuel pumps
Interestingly if you start the V2500 with the fuel pumps off you don't get the low pressure warning until the secon engine start.
Not sure why. Perhaps someone could enlighten me?
Not sure why. Perhaps someone could enlighten me?
Join Date: Mar 2005
Location: Queenland, Australia
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Perhaps the alert is inhibited until after the second engine start because fuel pressure drops below a certain threshold (in regards to gravity feeding) which may coincide with centre fuel tanks unable to run after 2 minutes from engine start, hence no pressure triggering the master caution..
Join Date: Apr 2008
Location: Near the tannhauser gate
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You can use the air conditioning in ground operations with the APU bleed, the switches are always in ON positon. The air conditioning packs will automatically turn off in the moment you select IGN/START in the engine mode selector. It turns on again about 20 seconds after the second engine is on.
The engines can be started with gravity feeding, you will have the abnormal procedure ENG/fuel pump lo press 1+2 for both engines in the ECAM.
The engines can be started with gravity feeding, you will have the abnormal procedure ENG/fuel pump lo press 1+2 for both engines in the ECAM.
Join Date: Jun 2008
Location: india
Age: 43
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The APU or external pnuematic cart supply the PACKS on ground. The PACKS have nothing to do with engine start but rather are only used for air conditioning on ground/air, and cabin pressurisation (controlled ofcourse by the CPC's). During engine start, as correctly pointed out in previous posts, PACKS automatically close once ENG MODE selector is at IGN/START, and open automatically 30 seconds after the second engine's N2 reaches 50% (on V2527 IAE engines).
The fuel pumps however need to be on for engine start as you would get the associated FUEL PUMP 1+2 LO PRESS ECAM.
Cheers
The fuel pumps however need to be on for engine start as you would get the associated FUEL PUMP 1+2 LO PRESS ECAM.
Cheers
