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AA787 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

The Ram Air Turbine (RAT) deploys automatically in flight under which of the following conditions?
-Loss of two electric motor-driven pumps (EMPs).
-Loss of electrical power to the Captain’s flight instruments.
-Loss of any two hydraulic systems.
-All three hydraulic system pressures are low.

A

All three hydraulic system pressures are low.

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2
Q

Regarding the hydraulic systems,…

-the airplane has three independent 5000 psi systems: left, right and center.
-the hydraulic reservoirs are pressurized by the bleed air system.
-the center hydraulic system has two air-driven hydraulic demand pumps for periods of high system demand.
-if center hydraulic system pressure is sensed low, the reserve brakes are isolated from the center system.

A

the airplane has three independent 5000 psi systems: left, right and center.

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3
Q

The left and right hydraulic systems are virtually identical. The left hydraulic system powers…

-flight controls, left thrust reverser, landing gear activation.
-flight controls, left thrust reverser, right and left wing spoilers.
-flight controls, left thrust reverser, left wing spoiler.
-flight controls, left thrust reverser, right wing spoiler.

A

flight controls, left thrust reverser, right and left wing spoilers.

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4
Q

The center hydraulic system is pressurized by…

-two electric motor–driven pumps (EMPs), C1 and C2.
-two engine-driven pumps and two electrically driven demand pumps.
-two electrically driven primary pumps and two air-driven demand pumps.
-two air-driven primary pumps and two electrically driven demand pumps.

A

two electric motor–driven pumps (EMPs), C1 and C2.

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5
Q

Which of the following is NOT a condition during which the center demand hydraulic pump operates?

-From beginning of takeoff roll until the gear is up and the gear doors are closed.
- Flaps or slats are in motion.
-From takeoff thrust set until radio altitude exceeds 2000 feet.
-During descent when the gear lever is down and radio altitude less than 2000 feet until groundspeed less than 60 knots.

A

From beginning of takeoff roll until the gear is up and the gear doors are closed.

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6
Q

In addition to flight controls, the center hydraulic systems powers…
-landing gear actuation and nose gear steering.
-leading edge slats and trailing edge flaps.
-right and left wing spoilers.
-All of the above are correct.

A

All of the above are correct.

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7
Q

Under what additional conditions will the right and left hydraulic EMPs operate?

-From takeoff thrust set to flaps retracted
-During descent and landing from gear down or RA less than 1000 feet to groundspeed less than 40 knots
-Thrust reverser operation
-All of the above are correct.

A

All of the above are correct.

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8
Q

The Ram Air Turbine (RAT), when deployed provides hydraulic and electrical power throughout the flight envelope. T/F?

A

True

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9
Q

Hydraulic quantities, showing OF and RF on the status display, are inhibited in flight. T/F?

A

True

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10
Q

The left and right hydraulic demand pumps are…

-Electric motor-driven pumps (EMPs).
-Engine driven pumps (EDPs).
-Air driven pumps (ADPs).
-Power Transfer Units (PTUs).

A

Electric motor-driven pumps (EMPs).

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11
Q

In the AUTO position, the L and R hydraulic demand pumps will operate under which of the following conditions?

-During landing gear activation.
-From takeoff thrust set to flaps retracted.
-During landing gear retraction if center system pressure is low.
-When heavy braking is applies, determined by pedal deflection.

A

From takeoff thrust set to flaps retracted.

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12
Q

The Ram Air Turbine (RAT), when deployed, provides 5000 psi hydraulic power to the primary flight controls connected to which hydraulic system?

-Left
-Center
-Right
-Standby.

A

Center

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13
Q

The center hydraulic system is pressurized by…

-one electric motor-driven pump (EMP) as a primary pump and an air-driven pump (ADP) that serves as a demand pump.
-two air driven pumps (ADPs).
-two electric motor-driven pumps (EMPs) that alternate as a primary and demand pump.
-one electric motor-driven pump (EMP).

A

two electric motor-driven pumps (EMPs) that alternate as a primary and demand pump.

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14
Q

The center hydraulic system has isolation functionality in the event of a leak. Specifically, the isolation system uses three isolation valves and a reservoir standpipe to ensure the flight crew can…

-lower the landing gear and that nose wheel steering is operational for landing, rollout and taxi.
-lower the flaps and slats.
-move the horizontal stab and elevator.
-have anti-skid braking available for landing.

A

lower the landing gear and that nose wheel steering is operational for landing, rollout and taxi.

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15
Q

The Ram Air Turbine (RAT) deploys automatically in flight under which of the following conditions?

-Engine failure during go-around
-Loss of L1 and L2 buses
-Loss of all four electric motor-driven pumps (EMPs) and an engine fails on takeoff or landing
-Loss of all hydraulic pressure in the center and right hydraulic reservoirs

A

Loss of all four electric motor-driven pumps (EMPs) and an engine fails on takeoff or landing

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16
Q

Flight control system components are distributed so that any one hydraulic system can provide adequate airplane controllability. T/F?

A

True

17
Q

In addition to system pressure low in all three hydraulic systems, which of the following will also cause the Ram Air Turbine (RAT) to deploy?

-Loss of all four electric motor-driven pumps (EMPs).
-Loss of all four EMPs and faults in the flight control system occur on approach.
-Loss of three or more starter/generators.
-APU failure in flight.

A

Loss of all four EMPs and faults in the flight control system occur on approach.

18
Q

The Ram Air Turbines (RAT) can provide either emergency electrical or hydraulic power but not both simultaneously. T/F?

A

False

19
Q

What operational restrictions are placed on the Ram Air Turbine (RAT) when deployed?

-No operational ceiling restrictions but a 3-hour operating limit.
-No time restrictions, but a 39,000 foot operating ceiling.
-No operating time, airspeeds or altitudes limits.
-2 hours continuous operation with a 25,000 foot operating ceiling.

A

No operating time, airspeeds or altitudes limits.

20
Q

In flight, the “PRESS” light illuminated on the overhead panel Ram Air Turbine (RAT) switch indicates…
(Image Shows: RAT UNLOCKED and on the RAT Pushbutton an Amber “UNLKD” and White “Press”)

-hydraulic pressure greater than 5000 psi.
-hydraulic pressure less than 3000 psi.
-a need to press the switch to deploy the RAT.
-the RAT is deployed and center system primary flight control hydraulic pressure is greater than 3000 psi.

A

the RAT is deployed and center system primary flight control hydraulic pressure is greater than 3000 psi.

21
Q

What is the minimum airspeed necessary for the RAT to provide hydraulic power to the primary flight controls connected to the center hydraulic system?
-130 KIAS
-150 KIAS
-80 KIAS
-There is no minimum airspeed.

A

There is no minimum airspeed.

22
Q

The RAT can be deployed manually by pushing the RAM AIR TURBINE switch on the hydraulic panel. T/F?

A

True

23
Q

As part of the Before Starting checklist, the Electric Motor Pump (EMP) switches are all placed to the AUTO position. Prior to engine start, which hydraulic pumps are providing hydraulic pressure?
(Image Shows: Hydraulic Panel)

-L, C1 and C2, and R demand pumps
-None
-C1 and C2 demand pumps
-L and R EMPs

A

None

24
Q

Immediately after both engine starts are complete, with all hydraulic electric motor pumps (EMPs) in AUTO, which EMPs are now operating?

-L and R only
-L, C2 and R only
-L, C1 and C2 , and R
-C1 and C2 only

A

L, C1 and C2 , and R

25
Q

The left, right and center demand pumps operate for three minutes after the second engine is started. T/F?

A

True

26
Q

You observe the Hydraulic Panel and the displayed advisory message information to correctly conclude that the right engine primary pump pressure is low. What other hydraulic condition would also result in the R ENG primary pump FAULT light illuminating?
(Image Shows: Amber HYD PRESS PRI R on the EICAS, Hydraulic Panel R ENG Fault)

-Excessive primary pump fluid temperature.
-Low reservoir fluid level.
-Low primary pump fluid temperature.
-High primary pump pressure.

A

Excessive primary pump fluid temperature.

27
Q

You observe the Hydraulic Panel and the advisory message information to correctly conclude that the right engine primary pump pressure is low. What effect will this have on the right hydraulic system?
(Image Shows: Amber HYD PRESS PRI R, Hydraulic Panel R ENG FAULT)

-You will lose right hydraulic system pressure.
-The right EMP will provide a backup hydraulic power source.
-The Ram Air Turbine (RAT) will deploy to provide hydraulic power to the primary flight controls.
-The C2 electric motor-driven pump will crosstie to supply right hydraulic system pressure.

A

The right EMP will provide a backup hydraulic power source.

28
Q

After completing the appropriate non-normal checklist, you elect to display the hydraulic (HYD) synoptic display. The synoptic indicates…
(Image Shows: Amber Box with X on PRIMARY R ENG, Pressures are normal)

-the right thrust reverser is unavailable.
-the right demand EMP has automatically started and the right system is operating with normal pressure.
-the right hydraulic system quantity is low.
-the right hydraulic system is running at lower pressure than normal.

A

the right demand EMP has automatically started and the right system is operating with normal pressure.

29
Q

Hydraulic quantity is displayed on both the status display and the HYD synoptic display. The above status display indicates that you are where?
(Image Shows: Hyd QTY, OF & RF and PRESS)

-On the ground
-Above 400 feet
-On approach
-At cruise

A

-On the ground

30
Q

What effect will the condition displayed have on the operation of the aircraft?
(Image Shows: Amber HYD PRESS SYS R, EICAS Message)

-A flaps 20 landing is required.
-Nosewheel steering is inoperative.
-The right thrust reverser is inoperative.
-No effect.

A

The right thrust reverser is inoperative.

31
Q

You may be able to reestablish hydraulic pressure to the right system by deploying the Ram Air Turbine (RAT). T/F?
(Image Shows: EICAS Amber “HYD PRESS SYS R”)

A

False

32
Q

Presented with the hydraulic system indications, what system will ensure that the flight crew can lower the landing gear and possibly still have nose wheel steering?
(Image Shows: EICAS Amber, “HYD PRESS SYS C”)

-Reserve fluid pressurized by the Ram Air Turbine (RAT).
-Landing gear and nosewheel steering will be unavailable.
-Hydraulic isolation systems.
-Cross-tie through the standby hydraulic system.

A

Hydraulic isolation systems.

33
Q

With the hydraulic system indications shown, flaps will operate in _________ mode.
(Image Shows: EICAS Amber “HYD PRESS SYS C”)

-primary
-secondary
-alternate
-direct

A

secondary

34
Q

With the hydraulic system indications shown,…
(Image Shows: EICAS Amber “HYD PRESS SYS C”)

-roll rate will not be affected.
-speedbrake effectiveness will be normal.
-use flaps 20 and Vref 20 for landing.
-normal gear extension is operative.

A

use flaps 20 and Vref 20 for landing.

AA787 (20 decks)

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