Hydraulic System

Question 1

What is the normal hydraulic reservoir quantity?

Answer 1

45-85%

Question 2

The hydraulic quantity readout is only valid when the system is pressurized

Answer 2

True

Question 3

What hydraulic pumps are not controlled by the Hydraulic Control Panel

Answer 3

1A and 2A

Question 4

The hydraulic high temperature caution activates at what temperature?

Answer 4

Greater than 96 degrees C.

Question 5

Where does hydraulic pump 3B receive its power?

Answer 5

From AC Bus 1 or the ADG bus when ADG is deployed.

it is hard wired to the ADG

Question 6

What problems will be encountered with a HYD 2 LO PRESS message displayed, along with the loss of HYD SYS 3?

Answer 6

Nose gear will not extend during Landing Gear Manual Extension and a side slip may be required to assist/achieve MLG down lock. Nose wheel steering will be inoperative.

Question 7

How can the Hydraulic shutoff valve be closed to interrupt fluid to the EDP?

Answer 7

1. Press the white Hydraulic Shutoff switchlight

2. Press the ENG FIRE switchlight

Question 8

How is the fluid for system one and two cooled?

Answer 8

By ram air from the ram air scoop passing over the heat exchanger in aft equipment bay. An electric fan provides air during ground ops.

Question 9

With a B hydraulic pump in the AUTO position, what will cause the pump to operate?

Answer 9

Movement of the flaps from the 0 position.

Question 10

What is normal system pressure?

Answer 10

3000psi

Question 11

If the reservoir is outside of the normal range, what color will the digital quantity be displayed in?

Answer 11

White

Question 12

What kind of hydraulic fluid do we use and what is its color?**

Answer 12

Skydrol purple*****

Question 13

If pump 1A or 2A fails, will the respective electric pump activate automatically?

Answer 13

no

Question 14

When will the electric pumps automatically activate?

Answer 14

ACMP’s activate with their respective switches in auto, at least one generator online, and the flap position greater than 0

Question 15

Is system cooling provided for the hydraulic 3 system and why?

Answer 15

No because it has enough travel distance to self cool

Question 16

How are HYD 1 and HYD 2 cooled?

Answer 16

ram air in flight or fan in the ram air duct while on the ground blow cooling air over the shared hydraulic heat exchanger in the aft equipment bay

Question 17

If there is an engine driven pump problem, 1A or 2A, is the associated engine required to be shutdown?

Answer 17

No a shutoff valve has been positioned between the pump and the reservoir to isolate the pump from the system

Question 18

what is indicated by system being displayed in White vs Amber vs magenta

Answer 18

white means system pressurized over 1800psi
amber means system pressurized below 1800psi
magenta means sensing system is receiving invalid data

Question 19

How many total hydraulic pumps are there?

Answer 19

SIX 4 electric pumps and two engine driven pumps

Question 20

How can the engine hydraulic shutoff valves be closed?

Answer 20

by pressing the associated L or R HYD SOV switchlight or by pressing the associated eng fire switch

Question 21

What purpose does the accumulator serve?

Answer 21

It dampens oscillations in pressure

Question 22

What is the normal accumulator charge?

Answer 22

1500psi

Question 23

which system provides power to the brakes?

Answer 23

systems 2 and 3 inboard brakes, and 2 outboard brakes

Question 24

which system provides power to the nose wheel steering?

Answer 24

system 3