HYDRAULICS

Question 1

1. Left and right hydraulic system standpipes provide fluid to which pumps?

Answer 1

1. The engine driven pumps.

Question 2

2. The center hydraulic system standpipe provides fluid to which pumps?

Answer 2

2. All center system pumps (C2 primary, air-driven demand pumps, and RAT) except the primary C1 electric pump.

Question 3

3. Where can hydraulic fluid quantity be checked?

Answer 3

3. Quantities may be checked on the STATUS page or the Hydraulic Synoptic.

Question 4

4. What is the source of power for the pumps in the left and right hydraulic systems?

Answer 4

4. The left and right primary pumps are engine driven, and the demand pumps are electric.

Question 5

5. What is the source of power for the center hydraulic system pumps?

Answer 5

5. The primary pumps are electric, and the demand pumps are air driven.

Question 6

6. When electrical load shedding occurs, which hydraulic pumps are shed?

Answer 6

6. C2 primary pump

Question 7

7. When can both center hydraulic system air-driven demand pumps operate simultaneously?

Answer 7

7. When both are selected to the AUTO position of the selectors only

Question 8

8. When the center hydraulic system fluid quantity is sensed low and the airspeed is greater than 60 knots, how are systems affected?

Answer 8

8.
Alternate brakes are isolated from the center system and remain operable using reserve fluid.
Nose gear actuation and steering are further isolated and remain inoperable.
Leading edge slats are isolated and not allowed to operate in the primary (hydraulic) mode.

Question 9

9. When are nose gear actuation and steering reconnected?

Answer 9

9.
Airspeed decreases below 60 knots.
Hydraulic pressure to the center flight controls goes low.
The landing gear is selected down, both engines are normal, and both engine-driven pumps are providing pressure.

Question 10

10. In flight the Ram Air Turbine (RAT) deploys automatically with loss of what?

Answer 10

10.
Both engines are failed and center hydraulic pressure is low.
Both AC Transfer busses lose power.
All three hydraulic systems have low pressure.

Question 11

11. What do Primary Pump FAULT Lights indicate?

Answer 11

11.
Low primary pump pressure.
Excessive primary pump fluid temperature.
Pump selected off