Hydraulics

Question 1

What does an Engine or Electric Hydraulic Pump PRESS light indicate?

Answer 1

Low pump pressure

Question 2

What is powered by the Ram Air Turbine (RAT)?

Answer 2

Flight controls

Question 3

What condition automatically deploys the Ram Air Turbine (RAT)?

Answer 3

Both engines fail

Question 4

What is the minimum airspeed required to maintain adequate Ram Air Turbine (RAT)
hydraulic pressure?

Answer 4

130 knots

Question 5

What cockpit indication assures adequate pressure to the center system when the
Ram Air Turbine (RAT) is deployed?

Answer 5

PRESS light

Question 6

What does RF indicate on the Status page adjacent to hydraulic quantity?

Answer 6

Reservoir requires refilling

Question 7

What does the SYS PRESS light indicate?

Answer 7

Low system pressure

Question 8

Is it possible to deploy the Ram Air Turbine (RAT) on the ground with no power on
the aircraft?

Answer 8

Yes, RAT will deploy on the ground if RAT switch is

pushed regardless of Battery switch position

Question 9

How does pulling the Engine Fire switch affect the hydraulic system?

Answer 9

Shuts off fluid to the engine pump and depressurizes the

pump

Question 10

(757) What does the RSVR light indicate?

Answer 10

Low reservoir hydraulic quantity and/or pressure

Question 11

(757) What does the OVHT light indicate?

Answer 11

Respective pump temperature is high

Question 12

(757) What are the electrical inhibits associated with the hydraulic system?

Answer 12

With one engine‐driven generator operating and both
Center Electric Pump switches ON, the number two
electric pump is inhibited

Question 13

(757) Which components are powered by the left hydraulic system?

Answer 13

Flight controls, alternate brakes, left thrust reverser,
main cargo door, flaps and slats, landing gear, and
nosewheel steering

Question 14

(757) Which components are powered by the center hydraulic system?

Answer 14

Flight Controls

Question 15

(757) Which components are powered by the right hydraulic system?

Answer 15

Flight controls, normal and reserve brakes, and right

thrust reverser

Question 16

(757) What system uses the left reservoir reserve hydraulic fluid?

Answer 16

Power Transfer Unit (PTU)

Question 17

(757) What condition(s) cause the Power Transfer Unit (PTU) to operate
automatically?

Answer 17

Left engine failure and/or left engine‐driven hydraulic

pump pressure low

Question 18

(757) Which components are powered by the Power Transfer Unit (PTU)?

Answer 18

Landing gear, nosewheel steering, flaps and slats, and

main cargo door

Question 19

(757) What system uses the center reservoir reserve hydraulic fluid?

Answer 19

Ram Air Turbine (RAT)

Question 20

(757) What system uses the right reservoir reserve hydraulic fluid?

Answer 20

Reserve brakes

Question 21

(767) What does a QTY light indicate?

Answer 21

Low reservoir quantity

Question 22

(767) Which components are powered by the left hydraulic system?

Answer 22

Flight controls

Question 23

(767) What reservoir maintains reserve hydraulic fluid for use by reserve brakes and
steering?

Answer 23

Center hydraulic system

Question 24

(767) Which system(s) use reserve hydraulic fluid?

Answer 24

Reserve brakes and steering

Question 25

(767) Which components does the center hydraulic system power?

Answer 25

Flight controls, alternate brakes, reserve brakes, tailskid, landing gear, nosewheel steering, Hydraulic Driven Generator (HDG), and flaps and slats

Question 26

(767) Which components are powered by the right hydraulic system?

Answer 26

``` Flight controls and normal brakes and Pitch Enhancement System (PES) ```

Question 27

(767) When does the left electric demand pump operate in AUTO?

Answer 27

Left engine pump pressure low

Question 28

(767) When does the right electric demand pump operate in AUTO?

Answer 28

Right engine pump pressure low or flap lever in 1, 5, 15 | or 20 to ensure pressure to normal brakes during takeoff

Question 29

(767) When does the Air Demand Pump (ADP) operate automatically?

Answer 29

Low center hydraulic system pressure, heavy load items are selected or when the Hydraulic Driven Generator (HDG) is signaled to operate

Question 30

(767) What is the power source for the Air Demand Pump (ADP)?

Answer 30

Bleed air from the center pneumatic duct