Landing Gear (Hydraulic) Flashcards

1
Q

What is the gear actuated by?

A

Hydraulic power pack

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2
Q

What is the service valve beside the hydraulic power pack used for?

A

Hand pump actuation of the gear during ground maintenance operations

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3
Q

How many sections is the power pack divided into?

A

2

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4
Q

What are the two sections of the hydraulic power pack?

A

One section supplies the electrically driven hydraulic pump and the other supplies the hand pump

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5
Q

What annunciation illuminates when hydraulic fluid is low?

A

HYD FLUID LOW

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6
Q

How many hydraulic actuators are used in conjunction with the power pack for the gear to be extended and retracted?

A

3, one for each gear

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7
Q

When does the gear warning horn sound?

A

Flaps UP or APPROACH and either or both power levers retarded below approximately 85% N1.

Horn sounds and handle lights illuminate

Horn can be silenced by pressing the button

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8
Q

When else will the gear horn sound?

A

Flaps APPROACH regardless of power settings and neither can be cancelled

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9
Q

For normal retraction, when the safety switches sense an airborne condition and the LDG GEAR CONT switch is moved to UP, what does this do?

A

Completes circuits to the pump motor relay and up solenoid of the gear selector valve

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10
Q

How much power does the pump motor relay pull in to the hydraulic pump motor in the power pack?

A

28 VDC

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11
Q

Where is the fluid pressure directed to for gear retraction?

A

The retract side of all 3 gear actuators

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12
Q

At what PSI does the up lock pressure switch open & break the circuit to the pump motor relay to stop the pump motor?

A

2,775PSI

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13
Q

How does the gear stay retracted?

A

Pressure in the retract side

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14
Q

When will the uplock pressure switch close to re-establish the power circuit to the pump?

A

When system leakage drops the pressure to 2,475 psi

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15
Q

What locks the gear in the extended position?

A

Down lock mechanisms

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16
Q

What locks the nose gear down?

A

Mechanical lock within the nose gear actuator

17
Q

When does the circuit to the pump motor relay open and stop the pump?

A

When the last gear locks down