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756 Training > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

757/767: When deployed, the RAT drives a hydraulic pump that supplies adequate pressure for flight controls down to an airspeed of approximately

A

130 knots

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2
Q

757: External power is the sole source of electrical power. The center No. 2 electric hydraulic primary pump PRESS light is illuminated because:

A

In order to prevent electrical overloads, the pump is inhibited

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3
Q

757: When activated, the power transfer unit (PTU) supplements the left hydraulic system electric motor-driven pump to operate the following:

A

Flaps and slats, landing gear, nose wheel steering, HMG

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4
Q

767: When the air-driven pump (ADP) is inoperative:

A

Landing gear retraction and flap extension/retraction times increase

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5
Q

767: When the RESERVE BKS & STRG switch is pressed, the ___ is turned on regardless of switch position.

A

Center system No. 1 electric primary pump

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6
Q

767: Across the entire aircraft, how many hydraulic reservoir standpipes are there?

A

One

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7
Q

757/767: Yaw control is provided by a single rudder which receives hydraulic power from the ___
hydraulic system(s).

A

Left, center, and right

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8
Q

57; The power transfer unit (PTU) is automatically activated

A

If the left engine fails or the left engine-driven pump pressure is low

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9
Q

757: According to the graphic, the RSVR light is illuminated. This indicates that:

A

Reservoir quantity is low (below 50%) or reservoir air pressure is low

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10
Q

757/767: The hydraulic quantity for each hydraulic system is displayed:

A

On the EICAS STATUS display

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11
Q

757/767: The ram air turbine (RAT) is armed:

A

On the ground above 80 knots

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12
Q

757: According to the graphic, when the RESERVE BRAKES switch is activated, fluid trapped below a standpipe is made available to the. ____ system electric hydraulic pump.

A

Right

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13
Q

767: To prevent electrical overload, the No. 2 electric primary pump is inhibited when only one generator (APU or engine) or only external power is available and ____ is/are commanded to
operate.

A

The other three electric hydraulic pumps

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14
Q

767: The center system reservoir contains a standpipe to reserve a supply of fluid for the:

A

Reserve brakes and steering system

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15
Q

757: When the hydraulic motor generator (HM) is operating, hydraulic flow to the flaps and slats is ___ resulting in:

A

Reduced, increased operating time for these items

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16
Q

757: To prevent electrical overloads, the center No. 2 electric pump is inhibited when only one generator (APU or engine) or only external power is available and:

A

Both center hydraulic electric pump switches are on

17
Q

57: Can the hydraulic motor generator (HMG) be driven by the power transfer unit (PTU)?

A

Yes, the HMG may be driven by the PTU, if operating

18
Q

757: The center hydraulic system reservoir contains a standpipe to reserve hydraulic fluid for the____
in the event of a center system hydraulic leak.

A

Ram air turbine (RAT)

19
Q

The ___ is available to supply hydraulic pressure to the center system flight controls in the event of a dual engine failure in flight

A

Ram air turbine

20
Q

757: Across the entire aircraft, how many hydraulic reservoir standpipes are there?

A

Three

21
Q

757: The hydraulic motor generator (HMG) is automatically powered by the ___ whenever both main AC busses become unpowered in flight.

A

The left engine hydraulic pump or the PTU, if operating

22
Q

767: In the AUTO position, the air-driven demand pump (AD) operates automatically whenever the landing gear, flaps, slats, or speed brakes/ground spoilers are selected for operation. The ADP will also operate when:

A

Center system hydraulic pressure drops to a preset value

23
Q

767: The hydraulic motor generator (HMG) is automatically powered by the ___ when electrical power is lost from both main AC busses.

A

The center hydraulic system

24
Q

757: According to the graphic, the EICAS POWER XFER UNIT status message is displayed. What is the status of the power transfer unit (PTU)?

A

The PTU is not operating properly

25
Q

57; Trailing edge flaps and leading edge slats are hydraulically operated by drive units normally owered by the _____
hydraulic systems).

A

Left

26
Q

757/767: According to the graphic, what is the status of the ram air turbine (RAT)? RAM AIR TURB

A

The RAT is not stowed and locked, and is producing hydraulic pressure

756 Training (16 decks)

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