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Atlas Air B747 > Hydraulics > Flashcards

Flashcards in Hydraulics Deck (29):
1

Demand pumps come on in AUTO?

- Related ENG Pump output PRESS low
- Related Fuel Control Switch in CUTOFF
- Pumps 1 & 4 also w/flaps in transit/out of UP in FLT

2

Hydraulic system SYS FAULT light on panel mean?

- LO PRESS
- LO Reservoir
- HI TEMP

3

If engine driven pumps are operating normally, demand pumps 1 and 4 also operate?

- In transit on ground.
- Flaps out of UP in flight.

4

Hydraulic demand pump LOW PRESS light indicate?

- Selector OFF or AUX
- Output pressure LOW with PUMP ON
- Pump failure

5

When is ENG driven HYD pump pressurized?

- ENG running
- ENG Pump Switch ON

6

Which HYD demand pumps are air driven?

SYS 1 & 4 through respective L/R bleed air manifold. Air sources include Engine Bleed Air and APU Bleed Air.

7

Purpose of HYD AUX pump?

Used for ground ops until engine pump pressurizes.

* Example: Wheel Braking for towing.

8

Why are HYD reservoirs pressurized w/bleed air?

- Prevent pump cavitation
- Ensure positive flow during HI demand conditions

9

How does pulling FIRE Switch affect HYD SYS?

- EDHP SOV closes
- EDHP Depressurizes
- Related demand pump operates

10

Which HYD systems provide redundant power to primary flight controls?

SYS 1 and 4

11

HYD systems power primary flight controls?

SYS 2 and 3

12

HYD systems for upper/lower YD?

Upper - HYD SYS 3
Lower - HYD SYS 2

13

HYD system for stab trim and elevator feel?

HYD SYS 2 and 3

14

Which HYD systems power AP servos L, C, and R?

L = HYD SYS 3
C = HYD SYS 1
R = HYD SYS 2

15

Which HYD systems power the spoilers?

HYD SYS 2,3, and 4

16

Gear retraction HYD systems (numbered)?

1
4 | | 4
1

17

Speedbrake/Spoiler HYD systems (numbered)?

3-2-2-3 4-4 | | 4-4 3-2-2-3

18

Trailing Edge Flaps HYD systems (numbered)?

4-1 | | 1-4

19

PRESS amber light on engine pump switch?

Low engine HYD pump pressure

20

What happens when Demand Pump selector is placed in AUX position?

Pressurizes SYS 4 on the ground if GROUND HANDLING BUS is powered.

21

Aileron HYD SYS (numbered)?

(1/2)_(1/3) | | (4/2)_(4/3)

22

Nosewheel and Body Wheel Steer HYD SYS?

HYD SYS 1

23

Wheel Brakes HYD SYS?

NORM - SYS 4
ALT - SYS 1
ALT - SYS 2

24

Elevator HYD SYS (numbered)?

(1)_(1/2) | | (3/4)_(4)

25

Upper Rudder HYD SYS (numbered)?

1
3
3

26

Lower Rudder HYD SYS (numbered)?

2
4

27

What 4 monitors are observed when HYD SYS 4 - AUX ON?

- SYS FAULT Light OFF
- PRESS Light ON
- BRAKE SOURCE Light OFF
- ACCUMULATOR PRESS in GREEN band

28

BRAKE ACCUMULATOR HYD SYS?

HYD SYS 4

29

When will AUX Pump #4 stop its operation with the switch in the AUX position?

When the #4 EDHP is pressurized.

* EICAS: HYD PRESS DEM 4 displayed