Hydraulics Flashcards
Name some of the main users of the green system?
Landing gear, nosewheel steering, flight controls
Which hydraulic systems have engine driven pumps?
Green and yellow systems
The yellow system has an engine driven pump; what other means do we have to pressurize the yellow system?
Electric pump, PTU, and a hand pump for the cargo doors
How many pumps does the yellow system have (not counting the PTU)?
Three pumps: the engine, electric, and hand pumps
What does the yellow system hand pump provide pressure for?
Opening the cargo doors
When does the PTU operate?
When the pressure differential between the green and yellow system drops below a predetermined level.
Can fluid be transferred between hydraulic systems?
No
Will the PTU operate during cargo door operation?
No
Is it possible to pressurize the green hydraulic system on the ground via the PTU?
Yes
What are the hydraulic valves, and what is their function?
Priority valves cut off heavy load using units if system pressure drops below a predetermined value
With the airplane on the ground and the blue electric pump switch in AUTO, when will the blue pump be energized?
With at least one engine running
To emergency extend the gear the crew has to turn the gear crank 3 turns clockwise. What does this action accomplish?
This shuts off hydraulic pressure to the gear, opens the doors, and unlocks the gear
After emergency extension, do the gear doors remain open?
Yes
Do we have nosewheel steering after emergency gear extension?
No
