Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Atlas Air B747 April 2022 > Hydraulics *** > Flashcards

Hydraulics *** Flashcards

1
Q

When will the demand pumps operate if the hydraulic demand pump selector is
in the AUTO position?

A
  • EDP pump output pressure is low
  • Fuel control switch is in CUTOFF
  • Demand pumps 1 & 4 also operate when flaps are in transit, or flaps extended past 1
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does the hydraulic system (SYS FAULT) fault light indicate?

A
  • Low hydraulic system pressure
  • Low hydraulic reservoir quantity
  • Excessive hydraulic fluid temperature
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does a hydraulic demand pump low PRESS light indicate?

A
  • Demand pump selector positioned to OFF or AUX

* Demand pump commanded to operate and output pressure is low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does a hydraulic reservoir quantity indication of .80 mean, as displayed on
the Secondary EICAS display?

A

• 80% of normal service level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What does a magenta “RF” displayed next to a hydraulic quantity indicator on
the Secondary EICAS mean?

A

• The reservoir requires refill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When is the engine driven hydraulic pump pressurized?

A
  • The engine is running

* The engine pump switch is ON

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which demand pumps are air driven, and which ones are electric motor driven?

A
  • Systems 1 and 4 are air driven pumps, through the bleed air manifold.
  • Systems 2 and 3 are electric driven pumps.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the purpose of the auxiliary pump?

A

• Used for ground handling operations

  • Example: Wheel Braking for towing.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why are the hydraulic reservoirs pressurized by the bleed air system?

A
  • To prevent pump cavitation

* To ensure positive flow during high demand conditions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A
  • when flas are In transit on the ground.

- Flaps out of 1 in flight.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How does pulling FIRE Switch affect HYD SYS?

A
  • EDP SOV closes
  • EDP Depressurizes
  • Related demand pump operates
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Which HYD systems provide redundant power to primary flight controls?

A

SYS 1 and 4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

HYD systems power primary flight controls?

A

SYS 2 and 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

HYD systems for upper/lower YD?

A

Upper - HYD SYS 3
Lower - HYD SYS 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

HYD system for stab trim and elevator feel?

A

HYD SYS 2 and 3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

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

17
Q

Which HYD systems power the spoilers?

A

HYD SYS 2,3, and 4

18
Q

Gear retraction HYD systems (numbered)?

A

1
4 | | 4
1

19
Q

Speedbrake/Spoiler HYD systems (numbered)?

A

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

20
Q

Trailing Edge Flaps HYD systems (numbered)?

A

4-1 | | 1-4

21
Q

PRESS amber light on engine pump switch?

A

Low engine HYD pump pressure

22
Q

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

A

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

23
Q

Aileron HYD SYS (numbered)?

A

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

24
Q

Nosewheel and Body Wheel Steer HYD SYS?

A

HYD SYS 1

25
Q

Wheel Brakes HYD SYS?

A

NORM - SYS 4 Auto brake / anti-skid
ALT - SYS 1. No Autobarke / anti-skid
ALT - SYS 2. No Autobarke / anti-skid

Altérnate with Anti-Skid only lateral pairs of brakes front or back pair on each truck

26
Q

Elevator HYD SYS (numbered)?

A

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

27
Q

Upper Rudder HYD SYS (numbered)?

A

1

3

28
Q

Lower Rudder HYD SYS (numbered)?

A

2
4

29
Q

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

A
  • SYS FAULT Light OFF
  • PRESS Light ON
  • BRAKE SOURCE Light OFF
  • ACCUMULATOR PRESS in GREEN band
30
Q

What HYD SYS pressurized the BRAKE ACCUMULATOR?

A

HYD SYS 4

31
Q

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

A

When the #4 EDHP is pressurized.

  • EICAS: HYD PRESS DEM 4 displayed
32
Q

With the loss of hydraulic system 4 how do I lower the landing gear and flaps?

A

The Landing gear will have to be lowered using the Alternate Gear Extension switch.

The flaps will revert to Secondary mode and extend more slowly.

33
Q

What may cause the nose to pitch up on landing with the loss of hydraulic system 4?

A

Rapid extension of the Spoilers.

34
Q

What are some examples of major system components powered by each hydraulic system 1 and 4

A

• Systems 1 and 4 power the

steering
body gear
normal brakes (SYS 4),
alternate brakes (SYS 1),
trailing edge flaps

Systems 1 and 4 also provide redundant power to the primary flight controls.

35
Q

What are some examples of major system components powered by each hydraulic system 2 and 3

A

• Systems 2 and 3 power the

primary flight controls
stabilizer trim
elevator feel.

System 2 also powers the
alternate brakes
lower yaw damper.

System 3 powers the

upper yaw damper.

36
Q

What are some examples of major system components powered by each hydraulic system 1, 2 and 3

A

• Systems 1, 2, and 3 power

the respective center, right, and left autopilot servos (L,C,R are powered by systems 3,1,2 respectively)

37
Q

What are some examples of major system components powered by each hydraulic system 2, 3 and 4

A

• Systems 2, 3, and 4 power the spoilers.

38
Q

What are some examples of major system components powered by each hydraulic system

System 1 and 4?

Systems 2 and 3?

Systems 1, 2, and 3?

Systems 2, 3 and 4?

A

• Systems 1 and 4 power the trailing edge flaps, body gear, normal brakes (SYS 4), alternate brakes (SYS 1), and steering. Systems 1 and 4 also provide redundant power to the primary flight controls.

• Systems 2 and 3 power the primary flight controls, stabilizer trim, and elevator feel. System 2 also powers the alternate brakes and lower yaw damper. System 3 powers the upper yaw damper.

• Systems 1, 2, and 3 power the respective center, right, and left autopilot servos (L,C,R are powered by systems 3,1,2 respectively)

• Systems 2, 3, and 4 power the spoilers.

Atlas Air B747 April 2022 (41 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions