T-45A UJPT, E2-C2, ADV, & IUT Eng-09
Hydraulic System
b.
HYD 2 RESET button
Overlay 1
HYD 2 RESET Button
(1) Resets and stows RAT if HYD 2
EDP pressure above 1,800 psi
(2) Resets HYD 2 EDP bypass valve
when engine rpm above 45%
NOTE: Electrical power is
supplied by the 28 VDC essential
services bus.
NOTE: HYD 2 RESET might not
be enabled for up to 10 seconds
after the generator is on-line and
the BATTERY VOLTS gage on the
power management panel is in the
green range (24-29 volts DC). The
ADR will not function below 22.5
volts DC, and in the T-45A the
ADR BIT takes up to 10 seconds.
2.
WCP, both cockpits
Sg 3, fr 5
(2 Overlays)
Warning/Caution Light Panel
a.
HYD 2 PRESS caution light alerts
aircrew to possible HYD 2 EDP failure:
Overlay 1
illuminates when HYD 2 EDP pressure
drops below 1,660 +/- 110 psi. It will
also illuminate with functional HYD 2
EDP in cases where excessive
demand drops HYD 2 pressure below
1,660 +/- 110 psi. It extinguishes when
HYD 2 EDP pressure is above
2,000 psi.
HYD 2 PRESS CAUTION LIGHT
NOTE: As long as the HYD 2 pressure
gauge is cycling between 2,500 and
3,000 psi, the RAT is functioning and is
producing sufficient hydraulic pressure
to power the flight controls.
b.
RAT EXTEND caution light indicates
Overlay 2
RAT EXTEND Caution Light
that the RAT is extended
Page 9-22
(8-03) Original
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