T-45C TS, ADV & IUT ENG-09
Hydraulic System
2.
RAT accumulator
Overlay 2
RAT Accumulator
a.
Location: RAT bay, aft side
b.
Description: carries nitrogen preload and
provides hydraulic pressure to extend, and keep
fully extended, the RAT actuator when HYD 2
EDP pressure drops below 1500 psi
c.
Functional
(1) Stores hydraulic fluid under pressure to
raise the RAT in event of HYD 2 pressure
drop
(2) Provides backup supply of hydraulic
pressure for flight controls during operation
of the RAT
(3) Compensates for pressure fluctuations of
the RAT
(4) Provides pressure to keep the RAT
extended
d.
Physical
(1) Includes a pressure regulating valve
(cutout) and a cylinder with a free-floating
piston that separates fluid from nitrogen
(2) Regulator valve cycles pressure between
2500 and 3000 psi, because the RAT is a
fixed displacement pump whose output
pressure is not internally regulated
(3) Pressurized with nitrogen
3.
Emergency package assembly
Overlay 3
Emergency Package
Assembly
a.
Functional: automatically deploys the RAT and
directs Emergency Hydraulic System pressure
to flight controls when HYD 2 pressure below
1500 psi
(9-98) Original
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