T-45A UJPT, E2-C2, ADV, & IUT Eng-09
Hydraulic System
(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
changeover pressure
between the HYD 2 EDP and
emergency hydraulic system.
5.
EDP bypass valve
Overlay 5
EDP Bypass Valve
a.
Location: bottom, left aft fuselage
b.
Description
(1) Reduces load on engine during
start by bypassing output of EDP
to return side of system
(2) Bypass in effect when engine
below 42% rpm, e.g., start, flame-
out. A strictly "engine rpm" sens-
ing switch, controlled by the ADR,
initiates bypass
Page 9-19
(8-03) Original
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