Hydraulics Knowledge Review

Question 1

The right hydraulic system powers _____.

Answer 1

flight controls, right thrust reverser,

and normal brakes

Question 2

Flight control system components are distributed so that _____ can provide

adequate airplane control.

Answer 2

any one hydraulic system

Question 3

In flight, the RAT deploys automatically _____.

Answer 3

• Both AC transfer busses are unpowered, or
• Both engines are failed and center system pressure is low, or
• All three hydraulic system pressures are low.

Question 4

The left and right hydraulic demand pumps are driven by _____.

Answer 4

electric motor driven

Question 5

The FLT CONTROL HYD VALVE POWER switches on the Overhead

Maintenance Panel are used only _____.

Answer 5

only on the ground by Maintenance

Question 6

The Primary Electric C1 hydraulic pump FAULT light

is illuminated and ON

not visible indicates?

Answer 6

• Low primary pump pressure
• Excessive primary pump fluid temperature
• Pump selected off

Question 7

What does the RAT UNLKD light indicate?

Answer 7

The RAT is not in the stowed position.

Question 8

With AC power ON and the

right electric demand pump switch in the AUTO position

on the ground, the

Answer 8

pump runs continuously

Question 9

Which hydraulic pump(s) can load shed?

Answer 9

The primary C2 pump

Question 10

Hydraulic pressure for

landing gear retraction, extension, and steering

is supplied by the _____ hydraulic system(s).

Answer 10

center

Question 11

Both center air demand pumps operate _____.

Answer 11

to meet system demands when selected to AUTO

Question 12

With their respective switches in the AUTO position, the hydraulic demand

pumps operate _____.

Answer 12

when primary pump pressure is low

or when high demand is anticipated

Question 13

The RAT can be deployed manually by using the RAM AIR TURBINE switch _____.

Answer 13

with hot battery bus or

APU battery bus powered