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United Airlines 777 Airplane Systems Study Guide v5.2 (9/26/2023) > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Regarding the Center Hydraulic System:

Which pumps provide supplementary hydraulic power for periods of high system demand or when primary pump pressure is low on the center hydraulic system?

A

C1 and C2 air demand pumps

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2
Q

The Primary Electric C1 hydraulic pump FAULT light is illuminated and ON not visible indicates?

A

The C1 Electric Pump Switch is off.

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3
Q

Both center air demand pumps operate _______.

A

to meet system demands when selected to AUTO.

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4
Q

With AC power ON and the right electric demand pump switch in the AUTO position on the ground _________.

A

pump runs continuously.

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5
Q

With their respective switches in the AUTO position, the hydraulic demand pumps operate ____.

A

when primary pump pressure is low or when high demand is anticipated.

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6
Q

When a demand pump FAULT light illuminates, it indicates the following ______.

A

low demand pump output pressure, excessive demand pump fluid temperature, or the pump is selected OFF.

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7
Q

Which hydraulic pump(s) can load shed?

A

The primary C2 pump.

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8
Q

If a hydraulic system reservoir is filled to beyond the normal full service level, _____ appears on the Status page and HYD synoptic next to the Hydraulic QTY indication for that reservoir.

A

OF

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9
Q

The RAM AIR TURBINE PRESS light (overhead panel) indicates the RAT is deployed and the _____ system (s) flight control hydraulic pressure(s) is(are) normal.

A

center

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10
Q

The RAT can be deployed manually by using the RAM AIR TURBINE switch _____.

A

with hot battery bus or APU battery bus powered.

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11
Q

Hydraulic pressure for landing gear retraction, extension, and steering is supplied by the _____ hydraulic system(s).

A

center

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12
Q

If center hydraulic system quantity is sensed to be low, the system isolates and removes pressure to the nose gear and steering. The nose gear actuation and steering are reconnected when airspeed decreases below _____ knots.

A

60

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13
Q

The center hydraulic system powers _______.

A

the landing gear actuation and slats/flaps

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14
Q

The center hydraulic system powers _______.

A

alternate/reserve brake system

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15
Q

In the left and right hydraulic systems, the engine driven pumps receive fluid from the _____.

A

standpipes

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16
Q

What occurs if the center hydraulic system quantity is sensed to be low and airspeed is greater than 60 knots?

A

The reserve brakes are isolated from the center system and remain operable.

17
Q

(This question possibly replaced with a question of similar wording.)

In flight, the RAT deploys automatically if ______.

A

all three hydraulic systems lose pressure

18
Q

In flight, the RAT deploys automatically ______.

A

when all three hydraulic system pressures are low

19
Q

If electrical loads exceed the power available (airplane or external), ELMS automatically sheds AC loads by priority. Which of the following may load shed?

A

C2 hydraulic electric pump

20
Q

The left hydraulic system powers _______.

A

some flight controls and the left thrust reverser

21
Q

The right hydraulic system powers ______.

A

some flight controls, the right thrust reverser, and normal brakes

22
Q

Flight control system components are distributed so that ___________ can provide adequate airplane control.

A

any one hydraulic system

23
Q

The RAT provides hydraulic power to _______.

A

to the primary flight control components connected to the center hydraulic system

24
Q

What components does the right hydraulic system power?

A

Normal brake system.

25
Q

The left and right hydraulic demand pumps are driven by _________.

A

electric motors

26
Q

The FLT CONTROL HYD VALVE POWER switches on the Overhead Maintenance Panel are used only _____.

A

on the ground by Maintenance

27
Q

What does the RAT UNLKD light indicate?

A

The RAT is not in the stowed position

28
Q

If deployed, can the RAT be re-stowed in flight?

A

No.

29
Q

One of the conditions that will automatically deploy the RAT in flight is the _____.

A

failure of both engines and center hydraulic system pressure is low

30
Q

An RF indication next to the hydraulic quantity indicates that _______.

A

the reservoir requires filling

31
Q

Hydraulic fluid is supplied to each hydraulic system from the respective reservoir. The reservoirs are pressurized by _____.

A

bleed air.

32
Q

Doug spent several hours creating this Brainscape class. How can I show my appreciation for using these flashcards?

A

Make a small donation to his favorite charity! You can use PayPal!
https://www.flyingsamaritansmotherlode.org/

United Airlines 777 Airplane Systems Study Guide v5.2 (9/26/2023) (14 decks)

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