T-45C TS, ADV & IUT ENG-09
Hydraulic System
E.
HYD 1 malfunctions
Sg 2, fr 18, p 1
Hydraulic System
Block Diagram
1.
HYD 1 pressure falls below 1500 psi
(3 overlays)
a.
If HYD 1 pressure drops below 1500 psi for any
reason (pump failure, excessive demand,
engine flameout, or leak in system), FC priority
valve shuts off general services distribution
(1) No backup for some general services, i.e.,
slats and speed brakes
Overlay 1
NOTE: Speed brakes will blow back by
Wheel Brake/
force of airstream at speeds over 380 KIAS
Emergency Flap
Accumulator
(2) General services with independent backup
(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 (> 1600 psi) is regained (e.g.,
after engine restart or reduced demand), FC
priority automatically reselects general services
2.
HYD 1 EDP pressure falls below 1660 + 110 psi or
Overlay 2
HYD 1
600 + 50 psi
Caution Light
a.
MASTER ALERT light flashes
b.
HYD 1 caution light illuminates and caution
tone sounds
c.
Hydraulic pressure is provided to flight control
services as long as HYD 2 (or RAT) remains
operational (to other side of tandem actuators)
(9-98) Change 4
Page 9-17
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