T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(4) If engine rpm drops below 42%
(flameout), bypass valve opens to reduce
load on engine during start (airstart)
(5) When engine rpm rises above 45%, bypass
valve may be closed by pressing the HYD 2
RESET button
3.
HYD 2 output distribution
a.
Supplies flight controls: trailing edge
side of aileron PCUs and stabilator
PCU
b.
Charges HYD 2 system FC accumulator
c.
Supplies emergency package assembly
4.
Emergency hydraulic system: operational
characteristics
a.
Emergency package assembly directs RAT
accumulator pressure to RAT actuator, raising
RAT into airstream
b.
Supplies HYD 2 flight control services through
emergency package assembly
c.
If HYD 2 EDP is producing more than 1800 psi,
and engine rpm is equal to or greater than 45%,
HYD 2 RESET button can be used to retract
RAT
d.
Normal engine shutdown: RAT will extend
when HYD 2 pressure drops below 1500 psi
and will retract due to spring loading when HYD
2 pressure drops below 700 psi (air loads
permitting)
Sg 6, fr 37
5.
Hydraulic system controls and indicators
Hydraulic System
Pressure Gauges/Reset
Button
a.
Cockpit controls and indicators
(9-98) Original
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