The air conditioning system uses hot bleed-air from which source?

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Multiple Choice

The air conditioning system uses hot bleed-air from which source?

Explanation:
Hot bleed air from the engines powers the air conditioning packs, and on many aircraft this air is collected and routed to the packs through a cross-wing manifold. This manifold acts as the common source, merging bleed air from both engines so the packs can receive a steady supply. The other options aren’t sources of feed for the packs: engine exhaust isn’t used for cabin conditioning, APU bleed is only a supplemental source used when needed (e.g., on the ground or with engines off), and cabin air is the air that’s being conditioned, not where the packs draw their supply from.

Hot bleed air from the engines powers the air conditioning packs, and on many aircraft this air is collected and routed to the packs through a cross-wing manifold. This manifold acts as the common source, merging bleed air from both engines so the packs can receive a steady supply. The other options aren’t sources of feed for the packs: engine exhaust isn’t used for cabin conditioning, APU bleed is only a supplemental source used when needed (e.g., on the ground or with engines off), and cabin air is the air that’s being conditioned, not where the packs draw their supply from.

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