Hydraulics Flashcards

1
Q

There are 4 independent systems driven by

A

EDP (Engine driven pumps) & Demand pumps ()

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2
Q

Systems 1 and 4 have demand pumps.

A

ADP (Air Driven) ()

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3
Q

Systems 2 and 3 have demand pumps.

A

ACMP (AC electric) ()

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4
Q

The _____ Aux Pump works with System fluid.

A

4

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5
Q

The Aux pump is operated by a _____system.

A

electric ()

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6
Q

The Aux pump can be used both on the ground and in the air. True or False

A

False. Ground use only, for breaking and MX purposes ()

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7
Q

What hydraulic system powers the alternate brakes and the body gear steering system?

A

System 1 only (FCOM 13.20.2)

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8
Q

What hydraulic system powers the respective autopilot servos?

A

3 Left Autopilot, 1 Center Autopilot and 2 Right Autopilot (FCOM 13.20.2)

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9
Q

What causes the EICAS message “HYD PRESS DEM” to remain displayed after the selector has been placed in the ON position?

A

Pump pressure low.

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10
Q

<p>Select the correct statement:</p>

A

<p>Demand pumps 1 &amp; 4 operate pneumatically. Electric power is required for EDP aux pump</p>

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11
Q

The electric AUX pump in system 4 …

A

Will produce normal breake pressure when on the ground

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12
Q

Demand selector 4 is in AUX. Select the correct statement…

A

The AUX pumps stops when EDP provides pressure

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13
Q

The EDPs can not deliver hydraulic pressure …

A

While engines are not running, and engine pump not switched ON, and eng fire switch pulled ()

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14
Q

<p>With flaps in landing position during approach ...</p>

A

<p>HYD 1 &amp; 4 demand pumps activate ()</p>

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15
Q

Engine 3 is shut down due to a fire warning and the fire switch is pulled, and fuel control switch 3 in CUTOFF. Select the correct statement:

A

EDP depressurizes, and the respective demand pump operates, SOV 3 closed

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16
Q

You are on approach selecting flaps 5. HYD PRESS DEM 1 message appears. What should be done?

A

Possible auto logic failure. Turn HYD 1 demand pump on ()

17
Q

Which abnormal condition does not trigger the SYS FAULT light?

A

system reservoir pressure low ()

18
Q

The beeper sounds and hydraulic SYS FAULT light 2 is on. Which message triggers the EICAS caution alert?

A

HYD PRESS SYS 2 (FCOM Chapter 13 Section 30)

19
Q

During flap extension while taxiing out, the SYS FAULT light 4 illuminates and the message HYD OVHT 4 appears. What describes the situation correctly?

A

Excessive hydraulic temp. detected. (When temp above 105 deg) possible overheated pump. ()

20
Q

What conditions would cause the DEMAND pumps to operate with the selector in the AUTO position?

A

Respective engine output pressure low or fuel control switch in cutoff. ()

21
Q

When the #1 EDP switch is ON, when will the #1 engine produce pressure?

A

Eng rotates ()

22
Q

What condition would automatically command Hydraulic demand pumps #1 and #4 to operate?

A

TE flaps in transit, or flaps extended with engines IDLE ()

23
Q

What causes the EICAS message “HYD PRESS DEM 4” to be displayed?

A

Selector in AUX position after ENG startup

24
Q

The HYDRAULIC demand pump in System 4 is disabled when the system 4 demand pump selector is in the AUX position. True or False

A

TRUE ()

25
Q

With a HYDRAULIC system 1 failure, what capability is lost?

A

Center Autopilot, Inboard TE flap, Nose & Body Steering\actuation, Left outboard elevator ()