T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
between the HYD 2 EDP and
emergency hydraulic system.
NOTE: The emergency package assembly
isolates the HYD 2 EDP from the system
when the RAT is deployed. To regain
HYD 2 EDP pressure (and stow the RAT),
the HYD 2 RESET button must be pressed.
G.
Emergency hydraulic system summary:
The emergency hydraulic system acts as a
backup to HYD 2 in the event of a HYD 2
pressure loss. It is able to maintain pressure to
provide hydraulic power to the flight controls.
RAT deploys regardless of the condition of
HYD 1 and/or HYD 2 EDPs whenever HYD 2
pressure decreases below 1,500 psi. The
following major components enable the
emergency hydraulic system to perform this
function: the ram air turbine (RAT), the RAT
accumulator, the HYD 2 reservoir, and the
emergency package assembly.
H.
Controls, switches, and indicators
1.
Interior of aircraft:
a.
Left console, both cockpits
(1) HYD 1 pressure gauge
(2) HYD 2 pressure gauge
(3) BRAKE pressure gauge
(4) HYD 2 RESET button: located on
the left console, forward of the
throttle. Pressing the button with
HYD 2 EDP pressure above
1,800 psi closes the HYD 2 system
bypass valve after engine start/
restart or airstart and retracts the
RAT if deployed
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(8-03) Original
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