T-45A UJPT, E2-C2, ADV, & IUT Eng-09
Hydraulic System
(1) No backup for some general ser-
vices, i.e., slats and speed brakes
NOTE: Speed brakes will blow
back by force of airstream at
speeds over 380 KIAS.
(2) General services with independent
Overlay 3
backup
Wheel Brake/Emergency Flap
Accumulator
(a) Landing gear: gravity free-fall
backup for extension only
(b) Flaps: one full flap extension
backup supplied by wheel
brake/emergency flap
accumulator
(c) Wheel brakes: 10 full
applications after emergency
flap extension supplied by
wheel brake/emergency flap
accumulator
b.
If HYD 1 pressure (> 1,600 psi) is
regained (e.g., after engine restart or
reduced demand), FC priority valve
automatically reselects general
services
3.
Leak in HYD 1
a.
Check valves limit loss of fluid if leak is
Overlay 4
confined to an individual component
Check Valves
(e.g., leaking launch bar actuator)
b.
Indications
(1) Visual confirmation
(2) When pressure drops below 1660
+/- 110 psi, HYD 1 PRESS caution
light illuminates
(8-03) Original
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