Hydraulics Flashcards

1
Q

Which pumps supply normal hydraulic

power to the hydraulic system

A

The 3 A pumps which operate

continuously

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2
Q

How many ACMP’s may be operating

on the ground while on APU power

A

One

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3
Q

Which hydraulic systems are powered

by engine driven pumps

A

Systems 1 and 2 by 1A and 2A

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4
Q

How is the hydraulic reservoir quantity

accurately checked before eng. start

A

Turn on the B pump to pressurize

the system

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5
Q

What is the priority for the ACMP’s

A

3A - 3B - 2B - 1B

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6
Q

When the ACMP is set to AUTO,

When will the pump start

A

Either slats or flaps not IN / 0, motion stopped,
and at least one eng. gen. operating

system 1 or 2 low pressure detected

Gear down

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7
Q
In flight, when system 
1 or 2 low pres.
detected, how long 
will the B pumps
operate once activated
A

minimum of 5 minutes

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8
Q

What ways can the
EDP HYD SOV
be closed

A

selecting the HYD SOV
switch closed

Pulling the fire discharge
handle

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9
Q

What are the electrically driven pumps

and associated AC buses

A

1B - AC bus 3
2B - AC bus2
3B - AC bus 1
3A - AC bus 4

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10
Q

What is the normal RAT accumulator

pre-charge pressure

A

1000 psi

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11
Q

What is the normal hydraulic system

brake accumulator pre-charge pressure

A

500 psi

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12
Q

How is hydraulic fluid
cooled prior to
returning to reservoir

A

Heat exchangers in
wing tanks

note:
Left wing
system 1 and 3

Right wing - system 2

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13
Q

Which hydraulic pumps are
available / operating during single
generator operations in flight

A

Engine pumps 1A and 2A

AC pumps 3A and 3B

Note:
1B and 2B are shed due to
buses being shed

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