How many heat exchangers are in each PACK?

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Multiple Choice

How many heat exchangers are in each PACK?

Explanation:
Two heat exchangers in each PACK provide both enough cooling capacity and redundancy for the environmental control system. The PACK must reject heat from bleed air to bring it to a usable, safe temperature, and having two exchangers lets the system share the heat load more effectively across different flight conditions. It also means one exchanger can be taken out of service for maintenance or if it degrades, without losing cooling entirely, keeping the system reliable and available. A single exchanger would limit cooling capacity and redundancy, while more than two adds unnecessary weight and complexity.

Two heat exchangers in each PACK provide both enough cooling capacity and redundancy for the environmental control system. The PACK must reject heat from bleed air to bring it to a usable, safe temperature, and having two exchangers lets the system share the heat load more effectively across different flight conditions. It also means one exchanger can be taken out of service for maintenance or if it degrades, without losing cooling entirely, keeping the system reliable and available. A single exchanger would limit cooling capacity and redundancy, while more than two adds unnecessary weight and complexity.

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