air used to cool hot air, AIR COOLING, COOLING AIR, to transfer from one circuit to another, SWITCHING CIRCUIT, CIRCUIT SWITCHING, procedure to check lights, LIGHT TEST, TEST LIGHT, signal sent back by the system, FEEDBACK SYSTEM, SYSTEM FEEDBACK, large groups (looms) of wires, WIRE LOOMS, LOOM WIRES, non-return valve, CHECK VALVE, VALVE CHECK, motor to move a valve, VALVE DRIVE, DRIVE VALVE, activates a valve electrically, SOLENOID VALVE, VALVE SOLENOID, air from engine compressor, BLEED AIR, AIR BLEED, system that provides hot air, AIR BLEED, BLEED AIR

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