A320: 1 Pack on if EXTRACT OVRD ON?
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A320: 1 Pack on if EXTRACT OVRD ON?
Hi guys,
I seem to remember we had to have at least one a/c pack on if you selected the EXTRACT pushbutton to OVRD, to aid cooling of the E&E bay. I can't seem to find any reference for this.
Does someone know where this is written down?
Many thanks,
Bbow
I seem to remember we had to have at least one a/c pack on if you selected the EXTRACT pushbutton to OVRD, to aid cooling of the E&E bay. I can't seem to find any reference for this.
Does someone know where this is written down?
Many thanks,
Bbow
Join Date: Apr 2004
Location: near EDDF
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Originally Posted by Bbow
Does someone know where this is written down?
BLOWER FAULT or EXTRACT FAULT warning
When the BLOWER or the EXTRACT pushbutton is set to OVRD (override)
position, the system is in closed-circuit configuration and adds the air from the air conditioning
system to the ventilation air.
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Hi IFixplanes,
I noticed that bit in the FCOM, thanks for the copy/paste. Just to clarify, does this mean that you actually need to have at least 1 pack on?
I pressume this air gets fed through the Air Con inlet V/V, from the AirCon Duct? And this Duct is obviously downstream of the packs?
I noticed that bit in the FCOM, thanks for the copy/paste. Just to clarify, does this mean that you actually need to have at least 1 pack on?
I pressume this air gets fed through the Air Con inlet V/V, from the AirCon Duct? And this Duct is obviously downstream of the packs?
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Yes, normally on the ground with OAT above about zero, air is drawn in from outside, and then exhausted overboard with two fans and two valves. If any of these fail, then air is drawn from the air conditioning system, downstream of the pack valves. ( The air upstream of the pack valves is too hot!)
This means that there are limits for how long you can have the aircraft powered with a AEVC failure with no packs running.
This means that there are limits for how long you can have the aircraft powered with a AEVC failure with no packs running.
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As you can see (on the already mentioned FCOM page) the system is in the closed circuit configuration and in addition the air it is in a (i would call it) closed loop. No air from the avionic bay area and no air to the cargo underfloor area. No system is 100% leakfree, so you have to add air.
The conditioned air inlet valve is installed in a duct which is connected to the cockpit main supply duct.
Location:
Edit: image added
Originally Posted by Bbow
... I pressume this air gets fed through the Air Con inlet V/V, from the AirCon Duct? And this Duct is obviously downstream of the packs? ...
Location:
Edit: image added
Last edited by IFixPlanes; 13th Mar 2009 at 18:26.
