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Proximity switch electronic unit

 Proximity switch electronic unit

Some aircraft are installed with a proximity switch electronic unit (PSEU). This unit receives the position of various items, e.g. flaps, gear, doors, etc and communicates this information to other systems including:

take-off and landing confi guration warnings

landing gear position indicating and warning

air/ground relays

airstairs and door warnings.

The PSU is integrated with the master caution system

and used to indicate if a problem exists that has

to be corrected before flight. (The above systems are

discussed in subsequent chapters.)


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