T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
2.
RAT accumulator
a.
Location: RAT bay, aft side
b.
Description
(1) Functional
(a) Stores hydraulic fluid under
pressure to raise RAT in
event of HYD 2 pressure drop
(b) Provides backup supply of
hydraulic pressure for flight
controls during operation of
RAT
(c) Compensates for pressure
fluctuations of RAT
(d) Provides pressure to keep
RAT extended
(2) Physical
(a) Includes a pressure regulating
valve (cutout) and a cylinder
with a free-floating piston that
separates fluid from nitrogen
(b) Regulator valve cycles
pressure between 2,500 and
3,000 psi (because RAT is
fixed displacement pump
whose output pressure is not
internally regulated)
(c) Pressurized with nitrogen
3.
Emergency package assembly
a.
Location: left upper fuselage behind
wing
Page 26-27
(8-03) Original
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