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DHL > B737 Hydraulics > Flashcards

B737 Hydraulics Flashcards

For which system powers which components, refer to my 737 deck

1
Q

What’s the normal pressure for the hydraulic brake accumulator?

A

3000PSI

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2
Q

What are the conditions that cause the landing gear transfer unit to operate?

A
  • airborne
  • No. 1 engine RPM drops below a limit value
  • LANDING GEAR lever is positioned UP
  • either main landing gear is not up and locked.
    (will use hydraulic system B to rause gear instead of A)
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3
Q

Is antiskid system available if all hydraulic pressure is lost?

A

Yes

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4
Q

What does an amber OVERHEAT mean above a electric hydraulic pump switch mean?

A

Hydraulic fluid used to cool and lubricate the corresponding electric motor driven pump has overheated or the pump itself has overheated.

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5
Q

What position should the engine driven hydraulic pump switches be at engine shutdown?

A

ON

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6
Q

What is the maximum hydraulic pressure of system A or B?

A

3500PSI

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7
Q

RF will illuminate next to hydraulic system A or B quantity when it is below what %?
It is only valid in certain circumstances - what are they?

A

76%
(refill)
Valid only when airplane is on ground with both engines shutdown or after landing with flaps up during taxi–in.

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8
Q

The standby hydraulic system is connected to which main hydraulic system?

A

B

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9
Q

What happens when you switch off an engine driven hydraulic pump?

A

Isolates fluid flow from system components but pump rotates as long as engine is operating.

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10
Q

If a leak develops in the electric motor driven pump of hydraulic system A or its related lines the reservoir will drop to what quantity?
Is system pressure maintained?

A

Zero, all pressure lost

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11
Q

If there is a leak in the engine driven pump of hydraulic system B or its related lines the reservoir will drop to approximately what quantity?
Is system pressure maintained?

A

Zero - all system pressure lost
(Still sufficient fluid for PTU)

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12
Q

If there is a leak in the electric motor driven pump of hydraulic system B or its related lines the reservoir will drop to approximately what quantity?
Is system pressure maintained?

A

Zero - all system pressure lost
(Still sufficient fluid for PTU)

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13
Q

Does a leak in hydraulic system B affect the operation of the standby hydraulic system?

A

No

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14
Q

To which main hydraulic system is the standby hydraulic system connected?

A

B

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15
Q

A hydraulic LOW PRESS light will illuminate when the hydraulic pressure drops below what psi?

A

1300 psi

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16
Q

Summarise what the PTU does

A
  • supplies additional volume of hydraulic fluid to operate auto slats and leading edge devices at normal rate if system B pressure is low (engine no.2 EDP pressure lost).
17
Q

What conditions cause the PTU to operate?

A
  • airborne
  • system B engine driven pump falls below 2350PSI for more than 0.5s
  • flaps not up
  • (some a/c flaps less than 15 but not up)
18
Q

Is there fluid transfer between hydraulic system A and B when the PTU is operating?

A

No - system A pressure is used to power a hydraulic motor driven pump which pressurises system B hydraulic fluid.

19
Q

If a leak occurs in the standby hydraulic system, the standby reservoir depletes to zero. What happens to system B quantity?

A

Decreases to around 72%.

20
Q

What happens if the Force Fight Monitor detects opposing pressure between A and B rudder actuators?

A
  • Standby hydraulic pump turned on
  • Standby rudder shut off valve open to pressurize the standby rudder PCU (and Thrust Reversers)
  • STBY RUD ON illuminates with Master Caution FLT CONT
21
Q

What conditions cause the standby hydraulic system to automatically operate?

A
  • loss of hyd. system A or B, and
  • flaps extended, and
  • airborne, or wheel speed greater than 60kts, and
  • FLT CONTROL switch A or B Hydraulic system ON
    OR
  • the main PCU Force Fight Monitor trips
22
Q

What is the brake accumulator pre-charge pressure?

A

1000PSI

23
Q

Autobrake requires which hydraulic system to be operating?

A

B

24
Q

The HYD Brake Pressure indicator reads zero, but both hydraulic system pressures are normal, what is this telling you?

A

The nitrogen precharge in the brake accumulator has leaked out, accumulator braking is not available but normal braking is unaffected.

25
Q

The HYD Brake Pressure indicator reads 1000PSI and both hydraulic system pressures are zero, what is this telling you?

A

Brake accumulator used up, no further braking available.

26
Q

When using alternate flap extension which system drives the leading edge devices to full extension?

A

Standby hydraulic

27
Q

If there is a leak in the engine driven pump of hydraulic system A or its related lines the reservoir will drop to approximately what quantity?
Is system pressure maintained?

A

20%
System pressure maintained by electric motor driven pump.

DHL (5 decks)

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