pressure to release the main gear inboard door
uplatches and to open the doors. The two main
gear red UNSAFE lights illuminate simultane-
ously with uplatch release.
When the inboard doors are fully open, the door
open switches are actuated to energize the gear
control valve. This directs pressure to release the
nose gear uplatch and extend the nose and main
gear (Figure 14-7). The nose gear red UNSAFE
light illuminates.
When the gear is fully down and locked, the
three green LOCKED DOWN lights illuminate
and the nose gear red UNSAFE light
extinguishes. Circuitry is completed by both
main gear downlock switches to energize the
door control valve to the closed position.
Pressure closes the gear inboard doors
(Figure 14-7), which lock in position by spring
tension on the door uplatches, and the two main
gear red UNSAFE lights extinguish.
14-8
FOR TRAINING PURPOSES ONLY
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