T-45A UJPT, E2-C2, ADV, & IUT Eng-09
Hydraulic System
(3) When pressure drops below 1,500
psi, general services isolated from
system
CAUTION: Placing EMER FLAPS switch
to the DOWN position when normal HYD
1 pressure is available will cause the
hydraulic fluid to rapidly overheat,
possibly causing a HYD 1 seal failure
resulting in HYD 1 system failure.
F.
HYD 1 operational characteristics summary:
HYD 1 is an independent hydraulic system used
to power the flight controls and general services.
If HYD 1 fails, some general services will be lost
while others will operate on emergency backup
systems only.
III. Hydraulic system No. 2 (HYD 2) 1.4.8.3.2
Sg 3, fr 1
Lesson Organization
A.
Description
Sg 3, fr 2
The HYD 2 reservoir supplies fluid to the HYD 2
(5 Overlays)
engine-driven pump (EDP) that, in turn,
WARNING
CAUTION
HYDFAIL
RATEXTEND LIGHT
LIGHT
CAUTION
CAUTION
HYD1PRESS LIGHT
HYD2PRESS
produces hydraulic pressure to power the flight
LIGHT
MICRO
SWITCH
RESERVOIR
RESERVOIR
FCACCUM
FCACCUM
controls.
EDP
EDP
L AIL
PRIORITY
RAM
VALVE
AIR
H
RAIL
Y
TURBINE
EMERGENCY
D
BYPASS
PACKAGE
RESET 2
HAND
VALVE
ASSEMBLY
PUMP
STAB
B.
HYD 2 components
SPDBRK
SLATS
LGEAR
NWS
FLAPS
LBAR
HOOK
HYD1 PRESSURE
MECHANICAL
1.
Reservoir
HYD2 PRESSURE
WHLBRKS
CHECK VALVE
PRESSURIZED WITH
FLAPEMERGENCY
RAT EXTENDED
SELECTOR/PRIORITY
AND GATE
VALVE
ELECTRICAL
HYDRAULIC SYSTEM BLOCK
a.
Location: RAT bay, topside of aircraft,
DIAGRAM
forward of the tail section (vertical
Overlay 1
stabilizer)
HYD 2 Reservoir
(1) Stores hydraulic fluid for HYD 2
operation
(2) Provides fluid under nitrogen
preload pressure to HYD 2 to
prevent EDP cavitation
Page 9-16
(8-03) Original
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