Hydraulics

Question 1

The hydraulic systems on the 737 are designated as ____.

Answer 1

System A, System B, and Standby

Question 2

Normal hydraulic system pressure is ____ psi.

Answer 2

3000

Question 3

Which of the following components are normally powered by Hydraulic System A?

Answer 3

Nosewheel steering (normal)

Question 4

Which of the following components are normally powered by System B?

Answer 4

Trailing Edge Flaps

Question 5

If either System A or System B is lost, the remaining system can power ____ with no decrease in airplane controllability.

Answer 5

the primary flight controls

Question 6

Turning Engine 1 or Engine 2 Hydraulic Pump Switches OFF ____.

Answer 6

blocks pump pressure output to the components

Question 7

Moving a FLT CONTROL switch to the STBY RUD position ____.

Answer 7

• activates the Standby Pump

- extinguishes the Flight Control LOW PRESSURE light when the Standby Rudder Shutoff Valve opens

Question 8

How are System A & B reservoirs pressurized?

Answer 8

Bleed air

Question 9

Main Hydraulic System A or B pressure is generated by ____.

Answer 9

both an AC electric motor-driven pump and an engine-driven pump

Question 10

An engine-driven hydraulic pump supplies approximately _____ times the fluid of an electric motor-driven pump.

Answer 10

6

Question 11

To block hydraulic fluid flow to the engine driven pump, ____.

Answer 11

pull the respective engine Fire Handle

Question 12

Heat exchangers used for cooling hydraulic fluid are located ____.

Answer 12

in Main Fuel Tank #1 for System A

in Main Fuel Tank #2 for System B

Question 13

With System A fluid level at the top of the standpipe, the reservoir quantity displayed indicates approximately ____ % full.

Answer 13

20

Question 14

With fluid level at the top of the standpipe, fluid remaining in the System B reservoir is sufficient for operation of the ____.

Answer 14

Power Transfer Unit

Question 15

The purpose of the Power Transfer Unit (PTU) is to ____.

Answer 15

supply hydraulic fluid volume needed to operate autoslats and leading edge flaps and slats

Question 16

The Power Transfer Unit (PTU) in A/C 3AA-3LB operates automatically when ____.

Answer 16

• System B engine-driven pump pressure drops below limits
• airborne
• flaps are less than 15 degrees but not up

Question 17

The Landing Gear Transfer Unit operates when ____.

Answer 17

• airborne and No. 1 engine RPM drops below a limit value

- the landing gear lever is positioned UP and a main gear is not up and locked

Question 18

The automatic operation of the Standby Hydraulic System is initiated when all the following conditions exist:

Answer 18

Loss of system A or B pressure, flaps extended, airborne, or wheel speed greater than 60 knots.

Question 19

The Standby Hydraulic System LOW QUANTITY Light illuminates when the reservoir is ____.

Answer 19

approximately 1/2 empty

Question 20

If a leak develops in Hydraulic System A engine-driven pump or its related lines, a ____ in the reservoir prevents a total system fluid loss.

Answer 20

standpipe

Question 21

If a leak develops in Hydraulic System A electric motor-driven pump or its related lines, the hydraulic fluid quantity in the reservoir decreases to ____.

Answer 21

0

Question 22

The Power Transfer Unit (PTU) uses ____ pressure to power a hydraulic motor-driven pump which pressurizes ____ fluid for use in operating leading edge flaps and slats.

Answer 22

System A, System B

Question 23

The minimum hydraulic System A and B pressure is ____ psi for preflight.

Answer 23

2800