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Boeing 737-800 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

Hydraulic operating pressure, minimum pressure & maximum pressure

A

Normal = 3000psi
Minimum = 2800psi
Maximum = 3500psi

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2
Q

Where are the hydraulic reservoirs and electric pump’s located?

A

The wheel well

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3
Q

How are hydraulic reservoirs pressurised and at what pressure?

A

Bleed air, 40-50psi

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4
Q

How is the stdby hydraulic system replenished and pressurised?

A

Connected to the Hyd B system

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5
Q

What type of hydraulic fluid is used?

A

BMS 3-11 type 4

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6
Q

What type of hydraulic fluid is used?

A

BMS 3-11 type 4

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7
Q

EMDP

A

Electric motor driven pump

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8
Q

EDP

A

Engine driven pump

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9
Q

How is the hydraulic low pressure light activated?

A

Illuminates when pressure drops below 1300psi, detected via the pressure module

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10
Q

How is the PTU activated?

A

Pressure module pressure switch sends a low pressure signal to the PTU when the EDP pressure drops below 2350psi for more than 0.5 seconds

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11
Q

How is the EMDP cooled and lubricated?

A

Via its own hydraulic fluid supply

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12
Q

What transfer bus powers the HYD A EMDP?

A

XFR Bus #2

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13
Q

What transfer bus powers the HYD B EMDP?

A

XFR BUS #1

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14
Q

What transfer bus powers the STDBY EMDP?

A

XFR BUS #2

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15
Q

EMDP output vs EDP

A

EMDP has 6x lower capacity output than the EDP

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16
Q

EMDP operating limits

A
  • 5 minute period - max 5 starts
  • When switched off wait 30 seconds before restarting the pump
17
Q

How is the STDBY EMDP cooled?

A

Cooled by airflow from outside the aircraft

18
Q

Minimum amount of fuel in the main tank to provide cooling for hydraulic heat exchangers

A

760kg in the associated tank

19
Q

Cockpit hydraulic overheat light parameters

A

Illuminates at 113 degrees Celsius
Resets at 85-102 degrees Celsius

20
Q

What does the cockpit EDP switch control?

A

Controls the position of the depressurising valve

21
Q

Function of the pressure module

A

-Protects from overpressure
-low pressure warning
-Transmits pressure readouts to DEU

22
Q

What does a flight control package contain?

A

-Flight spoiler shut off valve
-Flight control shut off valve
-Pressure switch (low pressure warning)
-Optional compensator cartridge

23
Q

What is the purpose of the flight control package compensator cartridge?

A

Maintains 40-70psi of hydraulic pressure to primary flight controls when hydraulics are off. Providing gust protection.

24
Q

Cockpit hydraulic flight control switch functions:

A

Off: Ailerons, Elevator and rudder are hydraulically isolated. Low pressure light illuminates.

Stby: Ailerons, elevator and rudder are hydraulically isolated. Low pressure light is inhibited. Stby rudder is activated.

25
Q

Hydraulic A reservoir, in case of a leak in the EDP line and EMDP line:

A

EDP line: Reservoir quantity will reduce to 20% (standpipe reaching up to the first 20% of the reservoir, EDP prone to leaks)

EMDP line: Reservoir quantity will reduce to 0%

26
Q

Hydraulic B reservoir, how much fluid is left if there is a leak?

A

Around 5 litres remain for PTU operation

(EDP and EMDP have a common standpipe)

27
Q

If there is a leak in the standby line what will occur to hydraulic levels?

A

Hydraulic B reservoir will drop to 70%

28
Q

At what quantity will RF (Refill) be displayed?

A

76%

29
Q

Hydraulic reservoir quantities:

A

Hyd A: 25.8L (100%: 21.6L)
Hyd B: 40.6L (100%: 31.1L)
Stby: 13.3L

30
Q

Function of the PTU

A

Supplies additional volume of hydraulic fluid needed to operate autoslats and leading edge flaps at normal rate when system B EDP volume is lost

31
Q

What is the function of the landing gear transfer unit?

A

Designed to raise the gear at a normal rate after EDP A volume is lost

32
Q

What does the standby hydraulic system supply?

A
  • Standby rudder PCU
  • Standby yaw damper
  • Leading edge flaps and slats (Extension only)
  • Thrust reversers
33
Q

Where is the standby EMDP located?

A

On the right aft wing to body fairing and cooled by outside air

34
Q

What is the power supply for the standby EMDP?

A

AC transfer bus 2

35
Q

When does the standby low quantity light illuminate?

A

Fluid quantity less than 50%

Boeing 737-800 (4 decks)

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