HYDRAULIC SYSTEM Flashcards
HYDRAULIC SCHEMATIC
The aircraft has two hydraulic systems, designated blue and green. Each system is pressurized by an electric pump, supplied by ACW power. The blue system is also provided with an auxilliary pump, supplied by DC power (automatic or manual mode).
Total volume: 9,6L
Normal filling: 9,35L
Minimum filling: 8,5L
Alert Level: 2,5L
HYDRAULIC ON RAMP (ONLY ON BATTERY)
On battery or DC GPU, the brake accumulator maintains a pressure for the parking brake (No hydraulic pump running)
HYDRAULIC ON RAMP
AUX PUMP P/B SELECTED ON THE PEDESTAL
HYDRAULIC SYSTEM NORMAL OPERATION
When both engine are running and the propellers are unfeathered, the blue and green pump are supplied by the ACW (blue and green systems available)
HYDRAULIC SYSTEM FAILURES
– Main pump low pressure (<1500PSI) or overheat (>121°C) ––> after cross feed both system are still available
– Low level (<2.5l) ––> cross feed inhibited (one system loss)
HYDRAULIC SYSTEM CROSSFEED OPERATION
After a main pump low pressure (<1500PSI) or overheat (>121°C) both systems are recovered by crossfeed operation
BOTH MAIN HYDRAULIC PUMPS LOSS
When the green system is lost, and there is a LO PR or OVHT on the blue system, the BOTH MAIN HYD PUMPS LOSS check list has to be applied.
When both main pumps are lost, the blue pressure is recovered in approach, by the aux pump, when the landing gear lever is selected down.
When the green system is lost, and there is a LO LVL on the blue system, the BOTH HYD SYS LOSS check list has to be applied. Only the emergency braking is available with the brake accumulator.
