T-45C TS, ADV & IUT ENG-09
Hydraulic System
3.
If HYD 2 EDP is producing more than 1800 psi, and
Overlay 3
engine rpm is equal to or greater than 45%, HYD 2
HYD 2 RESET
RESET button can be used to retract RAT
NOTE: The only indication of whether or not the
HYD 2 EDP is producing adequate pressure to stow
the RAT is the HYD 2 caution light extinguishing at
approximately 2000 EDP psi.
Overlay 4
4.
Normal engine shutdown
RAT Shutdown
a.
RAT will extend when HYD 2 pressure drops
below 1500 psi
b.
RAT will retract due to spring loading when
HYD 2 pressure drops below 700 psi (air loads
permitting)
Sg 4, fr 9
D.
Emergency hydraulic system malfunctions
Warning and Caution
Advisory Light Panel
1.
Failure of HYD 1 and HYD 2 combined with failure of
(1 overlay)
the emergency hydraulic system to produce
pressure will cause the HYD FAIL light to illuminate
and warning tone sounds. Possible reasons for
failure are:
a.
Failure of RAT to extend at 1500 psi and HYD 2
pressure below 1660 + 110 psi
b.
HYD 2 hydraulic system leakage (loss of fluid)
Overlay 1
associated with a HYD 2 caution light and
RAT Extend Caution
Light
caution tone
c.
Damage to RAT mechanism with RAT caution
light and failure of HYD 2 pressure to cycle
between 2500 and 3000 psi
2.
Loss of all hydraulic pressure will result in loss of
control of the aircraft
(9-98) Original
Page 9-31
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