Hydraulic system Flashcards
What is operated when using the hydraulic system?
Landing gear
Main gear doors
Flaps
Speed brake
Nosewheel steering
There is a single pump driven directly from the _____
Engine
The hydraulic system holds approx _ litres of fluid
5
The system has an ‘emergency’ side that allows for _____and ____ selection in the event of a pump failure or leak
GEAR FLAP
A pressure relief valve protects the system and returns fluid in excess of ____ psi to the oil reservoir through another oil filter
3500
The return side of the reservoir is held at __ psi by different sized pistons
50
What triggers the HYD FL LO caption?
If the level in the reservoir falls below 1 litre
How much pressure is required to raise the flaps?
3000 psi
What cuts off the flow of fluid if more than 1 litre/min flows for more than 30 seconds?
Hydraulic fuse
This is to protect the main system should a leak occur in the main system
What is the Emergency Accumulator filled with?
A helium bladder
What is the hyd pressure in the EA?
3000 psi
What triggers the EHYD PX LO caption?
If emergency accumulator pressure falls below 2400 psi
What 3 things happen if the EMERGENCY GEAR handle is pulled?
Pressurised fluid is sent to the isolating valve to shut off the main system
Pressurised fluid is made available to the flap selector
Pressurised fluid opens the gear doors and lowers the gear
What must you remember about flap selector under emergency gear conditions?
It cannot be raised since there is no main system pressure to raise it
Where is the hydraulic system service bay?
Located in the lower aft fuselage, behind the right wing trailing edge
