Landing Gear & Brakes Flashcards Preview

Atlas Air B747 > Landing Gear & Brakes > Flashcards

Flashcards in Landing Gear & Brakes Deck (47):
1

OFF position of the landing gear lever does what?

Depressurizes landing gear hydraulic system.

2

Nose Wheel Steering range with rudders?

7 degrees

3

Total turning range using tiller and rudder control?

70 degrees

4

When are AUTOBRAKES/RTO armed? When do they activate?

- Armed on the ground by selecting RTO

- A/C on ground
- Above 85 knots
- All TL CLOSED

5

BRAKE SOURCE Light?

HYD SYS 4, 1, & 2 have LO PRESSURE

6

Amber X on an expanded gear position indicator means?

Landing gear position indicator INOP

7

What sensing systems, related to gear, control flight/ground ops of systems?

- Air/Ground Sensors
- Nose Gear Extension Sensing System

8

How does A/C distinguish between air/ground mode?

Combination of main gear tilt sensors

9

Nose gear extension sensing provides signal to relays functioning which systems?

- Stall warning
- Nose Gear steering

10

What conditions must be satisfied for gear lever lock to release for retraction?

- Main gear tilted
- Body gear centered

11

Landing Gear UP sequence of events?

- Doors Open
- Auto braking occurs
- Gear begins retraction
- Main gear hydraulically tilt to retract position
- EICAS displays indication

12

How is gear held UP?

Main Gear - uplocks
Nose Gear - mechanically

13

During gear movement, what happens if any gear position disagrees with lever position after normal transit time?

- EICAS changes to non-normal format
- Affected gear displays as in transit
- Displays UP if never unlocked

14

Alternate gear extension sequence?

- Push alternate gear extend switches
- Gear uplocks/door latches electrically released
- Gear free falls
- Gravity extends gear
- Springs pull downlocks into locked position
- Gear doors remain open

15

When does body gear steering operate?

- Nose wheel steering angle +20 deg
- Ground speed decreasing through 15 kts

16

When is body gear steering deactivated?

Ground speed increasing through 20 kts

17

Purpose of brake accumulator?

Parking brake application

18

How does normal anti-skid provide protection?

Provides anti-skid to each main gear wheel individually. When skid is detected, associated valve reduces brake pressure.

19

How does alternate anti-skid system provide protection?

Provides protection to lateral wheel pairs rather than individually.

20

Brake torque limiter function in Alternate brake system?

- Brake torque is sensed on individual wheel basis however, brake pressure released on laterally paired wheel basis

21

When do autobrakes apply after landing?

- On Ground
- Wheels spun up
- All TL CLOSED

22

Ways to disarm autobrakes after landing?

- Pedals
- TL advance
- Speedbrake Lever to DOWN
- Selector to DISARM or OFF
- Autobrake fault
- Antiskid fault

23

Brake accumulator HYD SYS?

SYS 4

24

Why is HYD SYS 4 pressurized first?

Precludes the transfer of hydraulic fluid from SYS 1 or 2 into SYS 4 when parking brake is set and released.

* First HYD SYS pressurized will always return a small amount of fluid to HYD SYS 4

25

What value causes BRAKE TEMP message on EICAS?

Greater than or EQUAL TO 5 units

26

Is autobrake system available when alternate braking system is in use?

No, only primary.

27

All gear doors contain both ____ and ____ actuation?

Hydraulic and Mechanical:
- Wing Gear = 1 HYD & 1 MECH
- Body Gear = 1 HYD & 2 MECH
- Nose = 2 HYD & 2 MECH

28

Landing gear DOWN sequence of events?

- Doors open
- Gear are unlocked
- Gear hydraulically powered DOWN
- Door close
- Main gear trucks tilt to flight position

29

What EICAS landing gear position displays when alternate extension system is used?

Expanded gear position indication.

30

Nosewheel and body gear steering HYD SYS?

HYD SYS 1

31

What happens to body gear as speed increases through 20 knots?

Hydraulically centered

32

Do nose wheel have brakes installed?

NO

33

Normal braking HYD SYS?

HYD SYS 4

34

If HYD SYS 4 pressure is low for braking, what happens?

HYD SYS 1 supplies pressure to the alternate brake hydraulic system.

35

Placing AUTOBRAKES selector in DISARM does what?

- Disengages autobrake
- Releases brake pressure

36

Brake temp values on EICAS range from?

0 to 9

37

With regards to gear position indications, white crosshatch means?

In transit

38

AUTOBRAKES are only available when what braking system is functioning?

Primary, meaning HYD SYS 4 providing system pressure.

39

Is antiskid protection provided during AUTOBRAKE operation?

Yes, of course you idiot.

40

Alternate braking system simply means?

HYD SYS 4 was low and HYD SYS 1 is now providing pressure to braking system.

41

AUTOBRAKE upon landing provides braking until?

Complete stop or system disarmed.

42

When AUTOBRAKE system is disarmed upon landing (by using pedals braking for instance), where does selector move to?

DISARM

43

Where does AUTOBRAKE selector move to during takeoff?

Remain in RTO, even if disarmed. Moves to OFF after takeoff.

44

What decides which HYD SYS controls braking application?

Pressure operated selected valves

45

Is the RTO function of the AUTOBRAKES system available under 85 knots?

NO

46

Difference between OFF and DISARM switch positions on AUTOBRAKE PANEL?

- OFF will disarm and reset system
- DISARM will disarm system and release all brake pressure to the wheels.

47

When do AUTOBRAKES engage after touchdown?

- Weight on wheels
- Wheels spin up
- ALL Thrust Levers CLOSED