HYDRAULIC SYSTEM NO.2 – MAIN COMPONENTS
POWER CONTROL MODULE NO.2 (PCM 2)
The Power Control Module 2 (PCM 2) is an integrated assembly which
permits to store and distribute the hydraulic fluid in the hydraulic system no.
2. It is equipped with different sensors that provide control and monitoring of
the hydraulic fluid. The PCM 2 is connected to the main rotor and tail rotor
servo actuators and to the Landing Gear Control Valve (LGCV).
PUMP 2 AND PUMP 4
The pump 2 and the pump 4 are two identical mechanical pumps driven by
the MGB that keep a constant pressure output of 207 bar (3000 psi) with a
variable flow rate in the hydraulic system no.2. As a safety measure, the two
pumps are driven separately by the MGB.
TAIL ROTOR SHUT-OFF VALVE (TRSOV)
The Tail Rotor Shut-Off Valve is installed on the supply line of the TR
actuator of the system no.2. It automatically cut off the supply of hydraulic
fluid to the TR actuator in case the fluid falls below the minimum level.
SHUT-OFF VALVE NO.2 (SOV2)
The hydraulic system no.2 includes a Shut-Off Valves (SOV) that can be
closed to isolate the flight control circuit in case of system overheating.