The cold air plenum is a rectangular box which receives air from the three air conditioning packs, then mixes and distributes the available air to the four aircraft zones. The plenum is decided down its whole length by a perforated baffle. The air from packs 2 and 3 and approximately 60% of pack No. 1 air is mixed together for distribution to the three cabin zones. The other 40% from pack No. 1 is diverted by another baffle which directs the supply towards the flight station outlet duct.
The plenum is located at the rear right hand side of the FESC.
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