Hydraulic Subsystems
T-45A UJPT, E2-C2, ADV, & IUT Eng-13
b.
Sequence of nose gear/door extension
Sg 1, fr 11
Video: Landing Gear Extend
(1) Placing LDG GEAR UP/DN handle
Sequence
to DN electrically initiates
operation of landing gear
hydraulic control valve
(2) Hydraulic pressure is directed to
open forward doors (in
approximately 1 second)
(3) When gear doors fully open, gear
uplocks are hydraulically released,
and hydraulic extension actuator is
activated
(4) When fully extended, gear is
mechanically downlocked by ring
on drag brace
(5) After gear is down and locked,
forward nose gear doors close and
lock hydraulically
NOTE: Strut doors and the drag
brace fairing remain open because
they are mechanically linked to the
gear.
NOTE: The total time for NLG/
MLG extension is about 15
seconds.
c.
Sequence of main gear/door retraction
Sg 1, fr 12
Video: Landing Gear Retract
Sequence
NOTE: If the LDG GEAR handle is set
to UP with weight-on-wheels, the gear
will not retract.
(1) Placing LDG GEAR UP/DN handle
to UP electrically initiates
operation of landing gear hydraulic
control valve
Page 13-12
(8-03) Original
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