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#1. The ram air inlet flaps, {for the ACM heat exchangers}, automatically close under two conditions regardless of heat exchanger requirements. What are those two conditions? Where can you see them during walk-around inspection?
Each air conditioning system controller regulates the temperature of its associated pack by modulating the bypass valve and the ram air inlet flap.
The ram air inlet flap closes during takeoff and landing to prevent the ingestion of foreign matter.
Note:
- During takeoff, the flap closes when takeoff power is set, and the main landing gear struts are compressed.
- During landing, it closes as soon as the main landing gear struts compress, provided the speed is at or above 70 knots.
- The flap opens 20 seconds after the speed drops below 70 knots.