T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
b.
Description
(1) Functional
(a) Allows HYD 2 to charge RAT
accumulator during normal
operation
(b) Automatically deploys RAT
and directs emergency
hydraulic pressure to flight
control services when HYD 2
pressure drops below
1,500 psi
(c) Isolates sections of the HYD 2
system from the emergency
hydraulic system when the
RAT is deployed
(d) Allows resetting of the HYD 2
system via solenoid valve with
HYD 2 pressure above
1,800 psi
NOTE: The HYD 2 reset
button must be pressed to
regain HYD 2 EDP pressure
and stow the RAT.
(2) Physical
(a) Thermal relief valve
(b) Spool valve
(c) Solenoid valve (reset)
(d) Restrictor
NOTE: This group of valves
combines to determine
change over pressure
Page 26-28
(8-03) Original
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