T-45C TS, ADV & IUT ENG-09
Hydraulic System
E.
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 power to the flight
controls. RAT deploys regardless of the condition of the
HYD 1 and/or the HYD 2 EDP, whenever HYD 2
pressure decreases below 1500 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
PROGRESS CHECK
Question 1 — 1.4.8.3.1
What is the function of the emergency hydraulic system
and when does it activate?
ANSWER: The emergency hydraulic system acts as a backup
to the HYD 2 EDP. If the HYD 2 EDP is unable to maintain
sufficient pressure for any reason and HYD 2 EDP pressure falls
below 1500 psi, the RAT will deploy and provide emergency
hydraulic power to the HYD 2 side of the flight controls.
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