Hydraulic System

Question 0

How many hydraulic pumps are there?

Answer 0

2…. 1 powered by each engine

Question 1

What is powered by the Hydraulic system

Answer 1

Flaps
Speed brakes
Power brakes
Landing gear

Question 2

How many hydraulic filters are there

Answer 2

3

Question 3

A variable displacement pump is mounted on each accessory gear box and delivers how much pressure?

Answer 3

zero GPM at 1500psi to 3.9 GPM at 1400 psi

Question 4

How is the hydraulic fluid reservoir pressurized

Answer 4

by the air supply check valve up to 15 psi

Question 5

What is the capacity of the hydraulic reservoir?

Answer 5

1.2 gallons

Question 6

Where are the hydraulic fluid shutoff valves located?

Answer 6

Between the reservoir outlet and the fluid supply (suction) port

Question 7

What pressure does the hydraulic system normally stabilize at?

Answer 7

1500 psi

Question 8

When will the hydraulic relief valve open?

Answer 8

approximately 1650 psi

Question 9

How is the hydraulic valve package constructed

Answer 9

Three valve assemblies one each for

• Landing Gear
• Flaps
• Speed Brake System

Question 10

How does the Hydraulic Pressure Bypass switch work

Answer 10

in REL position

• bypass valve opens directing fluid back to the reservoir
• the valve and switch are powered by the right hand load bus

Question 11

When does the L/R H PMP PRESS LO annunciator illuminate

Answer 11

750 psi

Question 12

When does the HYD LEVEL LO annunciator illuminate?

Answer 12

When hydro fluid in the reservoir falls below 0.6 gallons