T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
F.
Emergency hydraulic system components
1.
RAT
a.
Location: RAT bay, aft fuselage
behind gravity filler cap, forward of tail
b.
Description
(1) Functional: produces hydraulic
pressure for emergency hydraulic
system in event of HYD 2 EDP
failure
(2) Physical
(a) Consists of a variable pitch
turbine, speed sensor, and
fixed displacement hydraulic
pump
NOTE: The RAT utilizes
HYD 2 reservoir fluid to
provide power for the
emergency hydraulic system.
(b) Mounted on hinged support
leg
(c) Raised into airstream
automatically by hydraulic
actuator when HYD 2 EDP
pressure drops below
1,500 psi
(d) Output volume and pressure
vary with pump speed (fixed
displacement pump)
(e) Speed limited by internal
governor to 7,300 rpm
(8-03) Original
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