Hydraulic System Flashcards
Hydraulic System 1 operates what systems ?
LH aileron,
LH Rudder,
LH Elevator,
LH Stabilizer,
Alternate brakes,
Landing gear,
Nose-wheel steering,
Flaps,
Speed brakes,
Lift dumpers,
Thrust reversers.
Hydraulic System 2 operates what systems ?
RH aileron,
RH rudder,
RH elevator,
RH stabilizer,
Normal brakes.
In the event of a single hydraulic system failure, what systems are not affected ?
The elevators and rudder is not affected.
Aileron control forces will be higher than normal
The main components for each hydraulic system are ?
A tank (reservoir),
Two engine-driven pumps,
One electrically driven pump.
A priority valve is installed in which hydraulic system ?
System 1
Each tank is pressurized by ?
Bleed-air
What allows the fluid level in the hydraulic tanks to equalise on the ground ?
A transfer system is installed that provides for a transfer valve to permit the equalisation of fluid levels between the two tanks.
The fluid transfer valve is normally closed but will open for a pre-set time when ?
The aircraft is on the ground,
The parking brake is set, AND
At least one engine is running.
Hydraulic power is supplied at a nominal
system pressure of ?
3000 psi by 2 engine-driven pumps on each engine.
True / False - The hydraulic system operation is not affected during single-engine
operation.
True
The main purpose of the low capacity electrically driven pump installed in each system is for ?
Maintenance system testing.
It can also be used to pressurize the brake system prior to engine starting (Sys #1).
The priority valve located in hydraulic system #1 will close if the system pressure falls below a pre-set value to ensure that power remains available for which components ?
- Flight controls,
- Speed brakes, and
- Thrust reversers.
The priority valve located in hydraulic system #1 will open to restore pressure to the landing gear, nose-wheel steering, lift dumpers, alternate brakes, and flaps, when the pressure rises above ? .
A pre-set value.
