T-45C TS, ADV & IUT ENG-10
Hydraulic System Malfunctions
PRESENTATION
I.
Uncommanded ram air turbine (RAT) extension
Fig 1: Hydraulic
System
A. Indications
Fig 2: Caution
Advisory Panel
1.
RAT caution light illuminated
2.
HYD 2 caution light not illuminated
NOTE: The RAT should extend only when HYD 2 pressure drops
to approximately 1500 psi. The HYD 2 caution light should
illuminate at 1660 +/- 110 psi, before the RAT deploys.
B. Verifications
1.
Visual confirmation
2.
Setting LIGHT/TONE TEST switch to LIGHT TEST
position verifies that HYD 2 light is operable
3.
RAT may be reset
NOTE: With engine at 45% rpm or more, the HYD 2 RESET button
may retract the RAT as long as HYD 2 EDP is operational and
pressure is above 1800 psi.
C. Effects on flight safety: if RAT not operating, then no flight control
backup if HYD 2 fails
II.
Flight control accumulator failure
Fig 1: Hydraulic
System
A. Indications
1.
Ground: absence of adequate accumulator pressure during
preflight
NOTE: The accumulator gauges for both systems are located in
the main wheelwells--system 1 on the right, system 2 on the left.
Each gauge should show 1100 +/- 50 psi.
2.
In flight
a.
Both systems, including accumulators, supply continuous
hydraulic power to flight controls
b.
With systems operating normally, no indication of a single
accumulator failure: if one accumulator fails, then redundant
accumulator provides adequate pressure damping and reserve
power
(9-98) Change 2
Page 10-3
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