Hydraulics Flashcards
EACH HYDRAULIC SYSTEM IS MAINLY PRESSURISED BY MEANS OF:
AN ACW ELECTRICAL PUMP
AN AUXILIARY DC ELECTRICAL PUMP IS LOCATED:
IN THE BLUE HYD SYSTEM
THE NORMAL HYDRAULIC PRESSURE OF THE BLUE AND GREEN SYSTEM IS:
3000 PSI
THE HYDRAULIC FLUID IS CONTAINED IN:
A SINGLE COMMON NOT PRESSURISED TANK, DIVIDED IN TWO COMPARTMENTS BLUE
AND GREEN, LOCATED IN THE HYDRAULIC BAY (LH LANDING GEAR FAIRING)
WHAT IS THE NORMAL ACCUMULATOR PRE-CHARGE PRESSURE ON THE THREE GAUGES
NEAR THE LEFT MAIN GEAR BAY;
1500 PSI
THE USERS OF THE BLUE HYDRAULIC SYSTEM ARE:
NOSE WHEEL STEERING, FLAPS, SPOILERS, PROPELLER BRAKE, EMERGENCY AND
Parking brake
THE USERS OF THE GREEN HYDRAULIC SYSTEM ARE:
LANDING GEAR AND NORMAL BRAKES
ON GROUND WITHOUT ELECTRICAL POWER (BATT SW OFF) WE CAN READ:
HYDRAULIC PRESSURE OR GAS PRESSURE GAUGE ON THE HYDRAULIC BAY (LH LANDING
GEAR FAIRING
ON GROUND, PUSHING THE “AUX PUMP” PB ON THE PEDESTAL ALLOWS:
TO ENERGISE THE AUX PUMP, WHICH PRESSURISES THE BLUE HYDRAULIC SYSTEM,
REGARDLESS BATT SW “ON” OR “OFF” POSITION
WITH THE AIRCRAFT ON THE GROUND AND RIGHT ENGINE RUNNING AT MAX RPM, THE
FOLLOWING MAIN PUMPS ARE ACTIVATED:
BLUE AND GREEN
WHEN PROPELLER BRAKE LOCKING SYSTEM IS INITIATED (ENGINE ONE STOPPED, ENGINE
TWO RUNNING):
AUX PUMP STOPS RUNNING WHEN PROPELLER BRAKE IS ENGAGED
THE “AUX PUMP” RUNS AUTOMATICALLY (PB PRESSED):
In FLIGHT: LOW PRESSURE IN THE BLUE SYSTEM, LANDING GEAR LEVER IS SELECTED
DOWN, AT LEAST ONE ENGINE RUNNING
ON GROUND: LOW PRESSURE IN THE BLUE SYSTEM, PROPELLER BRAKE NOT ENGAGED,
AT LEAST ONE ENGINE RUNNING
WHEN A “LOW PRESSURE” AMBER LIGHT ON GREEN HYDRAULIC PUMP PB COMES ON, THE
CROSS-FEED VALVE AUTOMATICALLY OPENS:
FALSE
IN CASE OF “BLUE HYDRAULIC MAIN PUMP LO PRESS” ALERT (IN FLIGHT GEAR UP)
AUX PUMP DOES NOT TAKE OVER AUTOMATICALLY
WITH BOTH “BLUE HYD PUMPS OFF” AND “GREEN HYD PUMP” RUNNING, CROSS-FEED
ALLOWS PRESSURISATION OF:
BOTH BLUE SYSTEM AND BRAKING ACCUMULATOR
