T-45C TS, ADV & IUT ENG-09
Hydraulic System
(1) Engine rpm controls the bypass valve
Overlay 1
through the airborne data recorder (ADR),
Bypass Valve/Reset
and HYD 2 RESET button
Button
Overlay 2
(2) On engine start, bypass valve opens to
Bypass Valve Output
send HYD 2 EDP output to return (reduces
Distribution
load on ATS during engine start)
Overlay 3
HYD 2 Pressure Lines
(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
NOTE: When airborne, the RAT will
begin supplying Emergency Hydraulic
System when HYD 2 EDP pressure
drops below 1500 psi. If RAT deploys
as a result of a decrease in HYD 2
pressure caused by excessive
demand, HYD 2 reset should be
accomplished to stow the RAT.
2.
Output distribution
a.
Supplies flight controls
(1) To trailing edge side of aileron PCUs
(2) To stabilator PCU
b.
Charges HYD 2 system FC accumulator
c.
Supplies emergency package assembly
(9-98) Original
Page 9-22
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