HYD System

Question 1

How many hyd pumps has the LEFT/RIGHT system

Answer 1

2 for each system

1. Engine driven pump (primary)
2. Electric pump (secondary)

Question 2

How many hyd pumps has the CENTER system

Answer 2

3 pumps

1. C1 & C2 pumps are electric (Primary)
2. ADP pump is air driven (Secondary)

Air demand pump is powered by the
pneumatic system
When there is a large demand
on the system the air supply valve
opens and the pump supplies
additional pressure also when system
PRESS is low

Question 3

Name the components that are powered by the LEFT HYD SYS

Answer 3

1. Stab Trim
2. Elevator Feel
3. Rudder Ratio
4. Yaw Damper (RIGHT)
5. Spoilers
6. Left Inboard Ailerons
7. Outboard Ailerons
8. Elevator
9. Rudder
10. Left AP servo

Question 4

Name the components that are powered by the CENTER HYD SYS

Answer 4

1. Stab Trim
2. Elevator Feel
3. Yaw Damper (LEFT)
4. Hydraulic Driven Generator (ELEC SYS)
5. Flaps/Slats
6. Main Gear
7. Nose Gear
8. Tailskid
9. Nose Wheel Steering
10. Alternate Brakes
11. Spoilers
12. Inboard Ailerons
13. Elevator
14. Rudder
15. RAT
16. Center AP servo

Question 5

Name the components that are powered by the RIGHT HYD SYS

Answer 5

1. PES
2. Normal Brakes
3. Spoilers
4. Inboard Ailerons
5. Outboard ailerons
6. Right Autopilot Servo

Question 6

Which Pneumatic system powers the ADP

Answer 6

Center Bleed System

Question 7

When does the “QTY” indication appear in the HYD system

Answer 7

Below 0.50

Question 8

When does the “RF” indication appear in the HYD system

Answer 8

Below 0.75

Question 9

Explain the electric shedding in the HYD system as engine starts

Answer 9

The Left Electric pump is load shed on the ground with either engine start

(PRESS light may illuminate)

Question 10

Explain the electric shedding in the HYD system with single source of electricity

Answer 10

The C2 pump in the CENTER hydraulic system is load shed whenever single source of electricity is being supplied to the airplane

Question 11

PES (pitch enhancement system)

Answer 11

The Pitch Enhancement
system automatically activates if
the left and center systems fail. A
pump in the right system uses
trapped fluid to operate the
stabilizer

Question 12

RAT

Answer 12

Should both engines
fail in flight, the RAT deploys
automatically
Airspeed +130 kts,
the RAT provides adequate
power for operations of the
flight controls portion of the
center hyd system