Hydraulics/Flight Controls Flashcards
What does the utility hydraulic system power?
Wing flaps Main landing gear Nose landing gear Normal brakes Nosewheel steering Aerial refueling reels Half of the aileron, rudder, and elevator control boost
What does the booster hydraulic system power?
Half of the flight control boost system
What does the auxiliary hydraulic system power?
ramp and cargo door emergency brakes emergency nose landing gear extension (AR system in case of utility failure)
How is the auxiliary system connected to the utility system on the ground?
ground test valve
Utility system reservoir
5.5 gallons
Booster system reservoir
3.1 gallons
Describe the utility/booster system reservoirs
non-pressurized gravity-fed
Suction boost pump pressures
0-20 gallons/min 70-90 psi
What are the engine-driven hydraulic pumps rated at?
3000 psi
The flow capacity of each engine-driven hydraulic pump depends on what?
engine RPM
When do the pressure relief valves open in the hydraulic system?
3450 psi and reset at 3100 psi they bypass 23 gallons/min when fully open
Where is the hydraulic ground test valve located?
aft of the left main landing gear wheelwell
What is the hydraulic ground test valve used for?
allows the aux hyd system to be tied to the utility hyd system ground maintenance and operational checkout of the utility hydraulic system
Why are the suction boost pumps turn on prior to starting engines?
To prevent cavitation
What utility hydraulic system pressure triggers the ACAWS caution UTIL SYS PRESS HI?
3450 psi
When the FIRE handle is pulled, which valves in the hydraulic systems are shut off?
the suction line shutoff valve the pressure line shutoff valve
Auxiliary hydraulic reservoir
5.3 gallons
How is the auxiliary hydraulic pump driven?
electrically-driven
Where can we read auxiliary hydraulic pressure at all times?
direct-reading pressure indicator
What is the benefit of the ground test valve in the hydraulic system?
eliminates the need for engine operation normally required to supply utility hydraulic system pressure