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7 > Hudraulics > Flashcards

Hudraulics Flashcards

1
Q

How many independent hydraulic systems does the 777 have?

A

3

Left, Centre & Right - each system has its own reservoir.

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2
Q

What powers the Left hydraulic system?

A

An engine driven pump & an electric motor pump

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3
Q

The right hydraulic system is powered by?

A

Also powered by an engine driven pump & an electric motor pump.

The Left & Right systems are identical

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4
Q

The engine driven pumps are the …………. Pumps?

A

Primary Pumps.

They are the main source of hydraulic power & operate when the engines are running.

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5
Q

The Electric Pumps are the …………. Pumps?

A

Demand

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6
Q

What’s the purpose of the Demand Pumps?

A

To supplement the Primary Pumps when demand is high.

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7
Q

The Centre hydraulic system uses ……… Electric Pumps as the ……….. Pumps

A

2, Primary

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8
Q

In the Centre hydraulic system, what type of pumps serve as Demand Pumps?

A

2 Air Driven pumps serve as Demand Pumps.

The air pumps are powered by bleed air.

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9
Q

A RAT (Ram Air Turbine) provides back-up hydraulic power to which system?

A

Centre hydraulic - the airstream powers the RAT

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10
Q

The hydraulic synoptic shows the system fluid quantities in …………. Of normal service level.

A

Percentage %

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11
Q

The left hydraulic system powers the ?

A

L thrust reverser & some of the flight controls

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12
Q

The Right hydraulic system powers which systems?

A

Normal brakes
R thrust reverser
Some flight controls

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13
Q

The Centre hydraulic system powers?

A

Nose Gear & Steering
ALTN/RSV Brakes
Flaps (& slats)
Main Gear & Steering
Some flight controls

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14
Q

How many hydraulic systems are required to power enough of the flight controls for safe flight?

A

Any one (1) system

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15
Q

Why do we set the Right Demand Pump selector (to auto) before selecting the other pumps?

A

Prevents fluid transfer

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16
Q

In the AUTO position, the ………… demand pump operates continuously when the a/c is on the ground, while the other demand pumps operate only when …………. or ………………

A

Right, additional system output is req’d or when the primary pins are not running.

17
Q

During engine start, the Left ………… Pump assumes the hydraulic load for the Left ………….. Pump

A

Primary, Demand

The Right Demand pump remains on until the airplane is airborne.

18
Q

The Left Demand Pump is commanded on at ……. Knots.

A

60 kts.

19
Q

The Left & Right Demand Pumps are commanded off above ……… ft radio altitude.

A

60 ft rad alt.

20
Q

Centre system Demand Pumps begin operating …………………… to be ready for …………………

A

during the t/o roll,
(to be ready for) landing gear retraction

21
Q

How many (Centre Hydraulic system) Demand Pumps are required to lower the landing gear?

A

One (1)

22
Q

When the engines are shut down, the Demand Pumps operate to …………….

A

maintain hydraulic pressure

7 (21 decks)

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