Hydraulics

Question 1

Name the 4 hydraulic systems

Answer 1

1. A
2. B
3. Standby
4. PTU

Question 2

Why is the electric pump for Hyd A named Elec 2

Answer 2

Because it’s powered by the #2 transfer bus

Question 3

How many times more powerful is an engine driven pump from an electric, and standby ? PTU ?

Answer 3

6 times and 9-10 times
PTU about 3 times

3-6-9

Question 4

What cools hydraulic fluid

Answer 4

Heat exchanger in wing tank

Question 5

What do both Hyd A and Hyd B power?

Answer 5

FEAR

Feel
Elevator
Ailerons 
Rudder 
Gear

Question 6

Minimum fuel for heat exchanger

Answer 6

760kg

Question 7

When is the PTU activated

Answer 7

To retract LEDs when Sys B EDP pressure is low (takeoff scenario)
To fully extend the LEDs if B EDP pressure is low during autoslat

Question 8

Where does the PTU get fluids

Answer 8

Sys B reservoir below the standpipe

Question 9

What powers the PTU

Answer 9

Sys A pressure

Question 10

Sys A leaks
EDP
EMDP

Answer 10

EDP: to the standpipe (20%)
EMDP: empty

Question 11

Sys B leaks
EDP
EMDP
Standby
PTU

Answer 11

EDP & EMDP to the standpipe (will show 0% but enough to power PTU)

Standby: to 72%

PTU: empty

Question 12

What major systems are lost with Sys B

Answer 12

Trailing edge flaps
Yaw damper
Normal brakes
Auto skats

Question 13

What major systems are lost/degraded with Sys A

Answer 13

Ground Spoilers
Landing gear (degraded)
Normal nose wheel steering