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Boeing 757/767 > 757 Hydraulic System > Flashcards

757 Hydraulic System Flashcards

1
Q

What is indicated by the hydraulic control panel “SYS PESS” light?

A

Low pressure in the associated hydraulic system

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2
Q

What is indicated by the “RSVR” light on the hydraulic control panel?

A

Low fluid quantity (less than 50%) or low pneumatic head pressure in the reservoir.

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3
Q

What does the amber “PRESS” light mean on an associated hydraulic pump?

A

Pump output pressure is low

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4
Q

What will happen if both center electric pumps are on and there is only one electrical source?

A

The right electric hydraulic pump will load shed

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5
Q

What does the “OVHT” light on the hydraulic control panel indicate?

A

An overheat in the associated pump case drain cooling

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6
Q

What happens when you turn off the engine driven hydraulic pump?

A

The associated engine driven pump is depressurized. This prevents pump output. Fluid continues to circulate through the pump for cooling and lubrication.

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7
Q

How many independent hydraulic systems?

A

Three

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8
Q

What systems are controlled by the left hydraulic system?

A 
Flaps and slats
Steer and gear
Alternate brakes
Flight controls
Left thrust reverser
Main cargo door
Reserve fluid for PTU
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9
Q

What systems are controlled by the center hydraulic system?

A

Flight controls

Reserve fluid for RAT

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10
Q

What systems are controlled by the right hydraulic system?

A

Flight controls
Right thrust reverser
Normal brakes
Reserve fluid for reserve brakes

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11
Q

What does “SYS PRESS” light on the hydraulic control panel indicate?

A

Low pressure in the associated system

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12
Q

What does the “RSVR” light on the hydraulic control panel indicate?

A

Low quantity or head pressure

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13
Q

What does the “OVHT” light on the hydraulic control panel indicate?

A

Hot pump

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14
Q

What does “RAT PRESS” (green light) within the RAT switch indicate?

A

Deployed and good hydraulic pressure

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15
Q

What is the minimum airspeed for the RAT to develop adequate pressure?

A

130 Knots

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16
Q

When is the PTU inhibited?

A

When the right engine has failed

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17
Q

Pushing the reserve brake switch does what?

A
  1. ) allows use of the reserve hydraulic fluid
  2. ) activates the right electric hydraulic pump
  3. ) isolates the right electric hydraulic pump power to the normal brake system
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18
Q

How much fuel is required in the left main tank for hydraulic fluid cooling while on the ground.

A

4020 pounds

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19
Q

Can the RAT be restowed once it has been deployed?

A

No

20
Q

What happens to the hydraulic system when the fire handle is pulled?

A

Closes the engine hydraulic supply valve

Depressurizes the engine driven pump

21
Q

What hydraulic system uses the RAT?

A

Center

22
Q

What is the lowest airspeed in which the RAT can provide adequate hydraulic pressure?

A

130 Knots

23
Q

How do you know that the RAT is providing adequate hydraulic pressure?

A

The green RAT PRESS light illuminates

24
Q

What does an illuminated hydraulic pump “OVHT” light mean?

A

The pump is overheated

25
Q

Which hydraulic system has fluid dedicated for reserve brakes?

A

Right

26
Q

Can the RAT automatically deploy?

A

Yes, anytime both engines fail above 80 knots

27
Q

What will cause the PTU to operate?

A

Left engine failure or left engine hydraulic pump low pressure

28
Q

What does the PTU operate?

A

Flaps
Slats
Landing gear
Nose wheel steering

29
Q

What electric bus controls the RAT?

A

Hot Battery Bus

30
Q

The “UNLKD” light on the RAT indicates

A

The RAT is not stowed

31
Q

Hydraulic system overfill is indicated by?

A

Magenta OF

32
Q

Low hydraulic system s indicated by?

A

Magenta RF

33
Q

What is the normal service level for a full reservoir?

A

1.00

34
Q

When will the left and right hydraulic pumps operate with ac power available?

A

Continuously with switches on

35
Q

Which systems are controlled by all three hydraulic systems?

A

Flight controls

36
Q

Which hydraulic system powers high load components?

A

Left

37
Q

Which hydraulic system provides pressure to the alternate brakes?

A

Left

38
Q

What is the purpose of the left hydraulic system reserve fluid?

A

To supply the PTU

39
Q

Which hydraulic system uses two electric motor driven pumps?

A

Center

40
Q

Which systems are powered by the center hydraulic system?

A

Flight controls only

41
Q

What is the purpose of the center hydraulic system reserve fluid?

A

Fluid for the RAT

42
Q

Which hydraulic system is supplied by the RAT?

A

Center - Primary Flight Controls

43
Q

In flight, what causes the RAT to deploy automatically?

A

Both engines fail

44
Q

What is the meaning of the green “PRESS” light in the RAT switch?

A

RAT is deployed and is producing adequate pressure

45
Q

Which hydraulic system provides pressure to the normal brakes?

A

Right

46
Q

Which brake system is active during a single engine taxi with all pumps on?

A

Normal Brakes

47
Q

What is the reserve fluid in the right reservoir used for?

A

Reserve Brakes

Boeing 757/767 (5 decks)

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