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737 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

System A powers?

A

Ailerons
Rudder
Elevator and elevator feel
Two flight spoilers on each wing

Number 1 reverser
Landing gear
Normal steering
Alternate brakes
Ground spoilers
Autopilot A
Power transfer unit
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2
Q

System B powers?

A

Ailerons
Rudder
Elevator and elevator feel
Flight spoilers x 2 on each wing

Number 2 reverser
Leading edge flaps and slats
Trailing edge flaps
Normal brakes 
Alternate nose wheel steering
Landing gear transfer unit
Autopilot b
Autoslats
Yaw damper
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3
Q

Mechanical engine driven pump switch to off does?

A

Energises blocking valve solenoid to block pump output.

Normally left in the on position to prolong the solenoid life.

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4
Q

Mechanical pump to electrical pump volume?

A

Mechanical pump outputs approximately 6 x the output of an electrical.

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5
Q

Pulling the engine fire switch does what to the hydraulic flow?

A

Shuts off the fluid flow to the engine driven hydraulic pump and deactivates the related LOW PRESSURE light.

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6
Q

How is hydraulic fluid cooled

A

In the respective fuel tank heat exchanger.

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7
Q

Minimum fuel quantity for the ground operation of the electric motor driven pump is?

A

760kg in the respective tank

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8
Q

What happens if a leak is in the system A hydraulic system?

A

Engine driven pump lines - volume decreases to approximately 20%. The electric driven pump can still use this volume

Electric driven pump lines - Volume will steadily decrease to 0% and all system pressure will be lost

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9
Q

What happens if the system B hydraulic system develops a leak?

A

If a leak develops in either pump or associated lines, the quantity decreases to zero and system pressure is lost.

However a standpipe allows the Power transfer unit enough volume to operate.

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10
Q

What does a leak in the B system do to the standby hydraulic system?

A

No effect

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11
Q

What conditions cause the PTU to operate?

A

System B engine driven pump hydraulic pump output pressure drops below limits.

Flaps are less than 15* but not up

Airborne

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12
Q

What does the PTU do?

A

Supplies an additional volume of hydraulic fluid needed to operate the autoslats and leading edge flaps and slats at a normal rate when system B engine driven pump volume is lost.

It uses system A pressure to power a hydraulic motor driven pump to pressurise the system B fluid below the standpipe.

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13
Q

What does the landing gear transfer unit do?

A

Uses system B fluid to raise the gear at a normal rate when system A engine driven pump output is lost.

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14
Q

Under what conditions does the landing gear transfer unit activate?

A

Airborne
#1 engine RPM drops below a limit value
Landing gear lever is positioned up
Either main landing gear is not up and locked.

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15
Q

What systems does the standby hydraulic system power?

A

Thrust reversers
Rudder
Leading edge flaps and slats (extend only)
Standby yaw damper.

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16
Q

How do you activate the standby hydraulic system in manual operation and what does it do?

A

Position either flight control switch to STBY RUD;

Activates the standby electric driven pump
Shuts off the related hydraulic system pressure to the ailerons, elevators and rudder by closing the flight control shutoff valve.
Opens the standby rudder shutoff valve
Deactivates the related flight control LOW PRESSURE light when the standby rudder shutoff valve opens
Allows the standby system to power the rudder and thrust reversers
Illuminates the STBY RUD ON, master caution and FLT CON lights.

17
Q

What does positioning the Alternate flaps master switch to ARM do?

A

Activates the standby electric motor driven pump
Closes the trailing edge flap bypass valve
Arms the ALTERNATE FLAPS position switch
Allows the standby system to power the leading edge flaps and slats and thrust reversers.

18
Q

What conditions cause the standby hydraulic system to automatically operate?

A

Loss of 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 flight monitor (FFM) trips.

19
Q

What does automatic operation of the Standby hydraulic system do?

A

Activates the standby electric motor driven pump
Opens the standby rudder shutoff valve
Allows the standby system to power the rudder and thrust reversers.
Illuminates the STBY RUD ON, master caution and FLT CON lights.

20
Q

What can the B system with a reservoir level of 72% full indicate?

A

The standby hydraulic system has a leak. Will also be indicated by the illumination of the LOW QUANTITY light.

737 (17 decks)

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