Hydraulics

Question 1

What is the power source for the rat switch?

Answer 1

Hot battery bus

Question 2

What are the conditions for rat deployment?

Answer 2

Both engine n2 below 50%
Aircraft is in the air
Min 80 kts airspeed

Question 3

What min airspeed do you need to maintain for the rat to be effective?

Answer 3

130kts

Question 4

What hyd system does the rap help power?

Answer 4

Center system

Question 5

What is the function of the rat?

Answer 5

Provide essential flight controls using the center system

Question 6

Can the rat be manually deployed on the ground?

Answer 6

Yes .. Press the switch

Question 7

How many hyd systems do we have?

Answer 7

3

Left, center , right

Question 8

How many hyd pumps on the left system?

Answer 8

2

One engine driven and one electric

Question 9

How many hyd pumps on the right system?

Answer 9

2

One engine driven and one electric

Question 10

How many hyd pumps on the center system?

Answer 10

3

2 electric and 1 air driven pump

Question 11

When does the adp kick in?

Answer 11

When it senses a low center system pressure or in times of great dmand

Question 12

What powers the adp?

Answer 12

Bleed air

Question 13

How many total hyd reservoirs do we have?

Answer 13

3.

One for each system

Question 14

What pressurizes the hyd reservoirs?

Answer 14

Bleed air

Question 15

Where is the center hyd pump heat exchanger located?

Answer 15

Right main wing tank

Question 16

Where is the left hyd pump heat exchanger located?

Answer 16

Left main fuel tank

Question 17

Where is the right hyd pump heat exchanger located?

Answer 17

Right main fuel tank

Question 18

How much fuel do you need to have im the main tanks to run the electric hyd pumps on the ground?

Answer 18

4000 lbs

Question 19

When only one electrical generator is operating with both electric pump switches ON and both L and R system electric pumps operating, what happens to the number two center electric hyd pump?

Answer 19

It is inhibited

Question 20

During engine start, which electric hyd pump is inhibited during engine starts?

Answer 20

Left electric hyd pump

Question 21

What happens to right electric hyd pump any time flaps are out of zero on the ground?

Answer 21

on the ground, the right demand pump comes on continuously any time the flap lever is in the 1, 5, 15, or 20 position. This assures pressure to the normal brakes during takeoff.

Question 22

When do all the edp’s operate in auto mode?

Answer 22

When there is a demand..

Question 23

What does the reserve brakes isolation light mean?

Answer 23

The reserve brakes and steering isolation (ISLN) light illuminates to indicate the center hydraulic system is isolated

Question 24

Does the aircraft go into reserve brake mode automatically?

Answer 24

Yes

Question 25

What is the purpose of pressing the reserve brake switch?

Answer 25

Pushing the reserve brakes and steering switch signals the number one electric pump to operate regardless of the pump switch position. The switch also signals the control valves to move to the isolated position.

Question 26

What should the valve light do when you press the reserve brake switch?

Answer 26

It should extinguish now that the valves agrees with the switch commanded position.. If the light still stays on then the valve is not in agreement with how the system should be configured when in reserve brake mode

Question 27

If you are single gen, which electric hyd pump is inhibited?

Answer 27

Number 2 electric hyd pump in the center tank

Question 28

When does the quantity light come on?

Answer 28

Reservoir quantity is about half