Hydraulics Flashcards

1
Q

What are min pumps and backup pumps for each Hydraulic system

A

Sys 1 and Sys 2 = Engine driven pump
Sys 1 backup is PTU
Sys 2 backup is AC pump
Sys 3 backup is 2 AC pumps

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2
Q

Where are located hydraulic system service panels?

A
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3
Q

What you switch on w HYDRAULIC 3A 3B 2B switches?

A

Hydr 3 and backup pumps

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4
Q

How are hydraulic systems pressurised when hydraulic pumps are not working

A

With accumulator pressurised with nitrogen

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5
Q

How are hydraulic systems cooled?

A

With fuel - hydraulic heat exchangers, hydraulics are cooled w fuel

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6
Q

How can hydraulic 1 and hydraulic 2 SOVs can be closed?

A

With Hydraulic SOV switches or ENG fire button

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7
Q

When the AC backup pumps start operating?

A

When EDP fails or in high system demand

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8
Q

How is RA5 deployed?

A

With Hydraulic System 3 that is pressurized by AC accumulators

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9
Q

When does RAT automatically deploy?

A

Total loss of AC power in flight

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10
Q

What happen when Hydraulic switch 2B or 3 B is selected ON not Auto?

A

Produces hydraulic pressure if fluid quantity is at least 5%

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11
Q

At what temperature amber hydraulic hi temperature is displayed in EICAS?

A

107 deg celsius

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12
Q

At what temperature the EDP closes the Hydraulic SOVs automatically?

A

At 125 c

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13
Q

At what pressure drop the priority valves tart to maintain minimum pressure?

A

At 1700 psi

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