T-45A UJPT, E2-C2, ADV, & IUT Eng-09
Hydraulic System
(3) Can be reset when engine is
above 45% rpm by pressing HYD
2 RESET button
C.
HYD 2 operational characteristics 1.4.8.2.2
Sg 3, fr 3
(3 Overlays)
1.
Input power: supplied by EDP
a.
EDP receives hydraulic fluid from HYD
2 system reservoir
b.
HYD 2 EDP also produces 3,000 psi
but at reduced (6 gpm) flow because
of smaller load
HYDRAULIC SYSTEM BLOCK
DIAGRAM
c.
Bypass valve controls output pressure
of EDP
(1) Engine rpm controls the bypass
Overlay 1
Bypass Valve/Reset Button
valve through the airborne data
recorder (ADR), and HYD 2 RE-
Overlay 2
SET button
Bypass Valve Output Distribution
(2) On engine start, bypass valve
opens to send HYD 2 EDP output
to return (reduces load on ATS
during engine start)
(3) May be reset (bypass valve
closed) by pressing HYD 2 RESET
button once engine rpm has
reached 45%
(4) If engine rpm drops below 42%
(flameout), bypass valve opens
(a) Valve opens to reduce load
on engine during start
(airstart)
(b) When engine rpm rises above
45%, bypass valve may be
closed by pressing the HYD 2
RESET button
Page 9-20
(8-03) Original
Previous Page
