T-45A UJPT, E2-C2, ADV & IUT Eng-13
Hydraulic Subsystems
3.
Operating characteristics 1.4.13.2.1
Sg 2, fr 18
a.
Setting HOOK control to DN in either
SELECTOR
VALVE
HYD1RETURN
D1RETURN
cockpit mechanically controls toggle
HYD 1 PRESSURE
HYD 1 PRES
HOOK
mechanism, which releases uplatch
and closes selector valve that releases
hydraulic pressure holding hook in up
UPLATCH
ASSEMBLY
position
ACTUATORDAMPER
ARRESTING HOOK OPERATION
b.
Hook extends in approximately 1-1/2
seconds
c.
Extension accomplished by gravity
free-fall, assisted by nitrogen pressure
(950 +/-50 psi) in actuator/damper
(hook snubber) assembly
d.
Setting HOOK control to UP operates
toggle mechanism that opens a
selector valve and applies hydraulic
pressure to actuator/damper, retracting
hook
e.
Retracts in approximately 6 seconds
f.
Retracts hydraulically by 3,000 psi
pressure from HYD 1
4.
Limitations: retraction of hook is not
possible following HYD 1 failure
NOTE: Maximum hook extension speed is
< 450 KIAS.
(8-03) Original
Page 13-45
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