How many air conditioning packs does the A321 ECS use?

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Multiple Choice

How many air conditioning packs does the A321 ECS use?

Explanation:
Two air conditioning packs provide conditioned air for the A321’s Environmental Control System. In normal operation, both packs work together to cool or heat the bleed air that goes to the cabin and cockpit, giving the system enough capacity and redundancy for typical passenger loads. If one pack is unavailable, the remaining pack can still supply conditioned air, though at reduced capability.

Two air conditioning packs provide conditioned air for the A321’s Environmental Control System. In normal operation, both packs work together to cool or heat the bleed air that goes to the cabin and cockpit, giving the system enough capacity and redundancy for typical passenger loads. If one pack is unavailable, the remaining pack can still supply conditioned air, though at reduced capability.

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