HYDRAULIC POWER - GENERAL
The purpose of the hydraulic power system is to supply the hydraulic power
necessary to operate:
• the flight control circuit (main rotor and tail rotor servo-actuators)
• the utility circuit (landing gear extension and retraction system)
The hydraulic power system is constituted by two independent circuits, the
system no.1 and the system no.2, that supply hydraulic fluid at a nominal
pressure of 207 bar (3000 psi).
Both systems supply hydraulic power to the flight controls.
The system no.1 is used to operate the landing gear only in emergency
situations.
The system no.2 is used to operate the landing gear in normal conditions
and is provided with a Tail Rotor Shut-Off Valve (TRSOV) to prevent a
possible fluid leakage.
In the system no.1 an electrical pump can supply hydraulic fluid at reduced
pressure for pre-flight check on ground only.
The HYD control panel shows over temperature and over pressure of the
hydraulic system and allows operating on the system itself.