Hydraulics Flashcards
How many hydraulic systems are there and what does each system provide?
2 systems.
System 1 provides: LH aileron, rudder, elevator, stabilizer, speed brakes, thrust reversers, landing gear, alternate brakes, nose wheel steering, flaps, LIFTD.
System 2 provides: RH aileron, rudder, elevator, stabilizer and normal brakes.
HYD: What items are not affected by failure of a single system?
Ailerons (except for higher loads)
Elevator and rudder. Stabiliser
HYD: What pumps are there in each system?
2 engine driven pumps (from both engines)
1 Electrical pump (maintence use mainly)
HYD: When will the tank transfer valve open and what is its purpose?
it will open or a pre set time with the aircraft on the ground, park break set and at least one engine is running.
it is to equalize the fluid level.
some aircraft the air pressure connection line has a shut of valve to equalize pressure and opens in parallel with transfer valve.
HYD: What is normal operating pressure and where is it displayed?
3000psi. overhead hydraulic panel.
What is the effect on the hydraulic systems if pulling a fire handle?
Close both the engines pumps off. Both systems will have one pump left each and will continue to operate.
What is the effect on the hydraulic systems of a failure of any engine?
both the engines pumps wont work. Both systems will have one pump left each and will continue to operate.
HYD: In which system us the priority valve and what is its purpose?
if pressure drops below 2300psi the priority valve will close to allow power to provide flight controls, speed brakes and thrust reversers.
HYD: When would you use the electric pumps?
For brake system prior to starting.
What is the minimum system quantity with the system not pressurized?
70%
What are the hydraulic alerts and what is their level?
Both system low pressure (alert 2) System low pressure (alert 2) Low fluid quantity (alert 2) Fluid overheat (alert 2) Engine pump fault (alert 1) Low tank air pressure (alert 1)
