Hydraulic Flashcards
How many hydraulic pumps are in each hydraulic system?
Both hydraulic systems are powered by one engine-driven pump and one electrically-driven pump. AOM 2-11-05 page 1
Besides differing consumers, what does hydraulic system 1 contain that hydraulic system 2 does not?
A priority valve. AOM 2-11-05 page 1.
How can the hydraulic shutoff valves be closed?
By a dedicated button on the overhead panel or by pulling the fire extinguishing handles.
AOM 2-11-05 page 2.
What pressure do the engine-driven hydraulic pumps maintain?
3,000 psi at 9.2 gallons per minute. AOM 2-11-05 page 2.
What pressure do the electric motor-driven pumps maintain?
2,900 psi at 0.7 gallons per minute continuous rate, or 1.5 gallons per minute intermittently. AOM 2-11-05 page 2.
When the electric motor-driven pumps are selected to AUTO, when do they turn on?
When the associated hydraulic pressure drops below 1,600 psi or the associated engine N 2 drops below 56.4%. AOM 2-11-05 page 2.
What does the priority valve do?
If the hydraulic system 1 is powered solely by the electric motor-driven pump and the landing gear is retracted,
the valve will provide minimum flow to the landing gear system, and give priority to the flight controls. In this case, the landing gear will operate through the accumulator pressure. AOM 2-11-05 page 4.
What is the purpose of the accumulator in hydraulic system 1?
To keep the surges of the hydraulic pumps at a minimum and to keep 3,000 psi available for operation of the landing gear and main door. AOM 2-11-05 page 4.
