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Atlas Air B747 > Landing Gear & Brakes > Flashcards

Landing Gear & Brakes Flashcards

1
Q

OFF position of the landing gear lever does what?

A

Depressurizes landing gear hydraulic system.

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2
Q

Nose Wheel Steering range with rudders?

A

7 degrees

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3
Q

Total turning range using tiller and rudder control?

A

70 degrees

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4
Q

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

A
  • Armed on the ground by selecting RTO
  • A/C on ground
  • Above 85 knots
  • All TL CLOSED
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5
Q

BRAKE SOURCE Light?

A

HYD SYS 4, 1, & 2 have LO PRESSURE

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6
Q

Amber X on an expanded gear position indicator means?

A

Landing gear position indicator INOP

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7
Q

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

A
  • Air/Ground Sensors

- Nose Gear Extension Sensing System

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8
Q

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

A

Combination of main gear tilt sensors

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9
Q

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

A
  • Stall warning

- Nose Gear steering

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10
Q

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

A
  • Main gear tilted

- Body gear centered

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11
Q

Landing Gear UP sequence of events?

A
  • Doors Open
  • Auto braking occurs
  • Gear begins retraction
  • Main gear hydraulically tilt to retract position
  • EICAS displays indication
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12
Q

How is gear held UP?

A

Main Gear - uplocks

Nose Gear - mechanically

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13
Q

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

A
  • EICAS changes to non-normal format
  • Affected gear displays as in transit
  • Displays UP if never unlocked
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14
Q

Alternate gear extension sequence?

A
  • 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
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15
Q

When does body gear steering operate?

A
  • Nose wheel steering angle +20 deg

- Ground speed decreasing through 15 kts

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16
Q

When is body gear steering deactivated?

A

Ground speed increasing through 20 kts

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17
Q

Purpose of brake accumulator?

A

Parking brake application

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18
Q

How does normal anti-skid provide protection?

A

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

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19
Q

How does alternate anti-skid system provide protection?

A

Provides protection to lateral wheel pairs rather than individually.

20
Q

Brake torque limiter function in Alternate brake system?

A
  • Brake torque is sensed on individual wheel basis however, brake pressure released on laterally paired wheel basis
21
Q

When do autobrakes apply after landing?

A
  • On Ground
  • Wheels spun up
  • All TL CLOSED
22
Q

Ways to disarm autobrakes after landing?

A
  • Pedals
  • TL advance
  • Speedbrake Lever to DOWN
  • Selector to DISARM or OFF
  • Autobrake fault
  • Antiskid fault
23
Q

Brake accumulator HYD SYS?

A

SYS 4

24
Q

Why is HYD SYS 4 pressurized first?

A

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
Q

What value causes BRAKE TEMP message on EICAS?

A

Greater than or EQUAL TO 5 units

26
Q

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

A

No, only primary.

27
Q

All gear doors contain both ____ and ____ actuation?

A

Hydraulic and Mechanical:

  • Wing Gear = 1 HYD & 1 MECH
  • Body Gear = 1 HYD & 2 MECH
  • Nose = 2 HYD & 2 MECH
28
Q

Landing gear DOWN sequence of events?

A
  • Doors open
  • Gear are unlocked
  • Gear hydraulically powered DOWN
  • Door close
  • Main gear trucks tilt to flight position
29
Q

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

A

Expanded gear position indication.

30
Q

Nosewheel and body gear steering HYD SYS?

A

HYD SYS 1

31
Q

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

A

Hydraulically centered

32
Q

Do nose wheel have brakes installed?

A

NO

33
Q

Normal braking HYD SYS?

A

HYD SYS 4

34
Q

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

A

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

35
Q

Placing AUTOBRAKES selector in DISARM does what?

A
  • Disengages autobrake

- Releases brake pressure

36
Q

Brake temp values on EICAS range from?

A

0 to 9

37
Q

With regards to gear position indications, white crosshatch means?

A

In transit

38
Q

AUTOBRAKES are only available when what braking system is functioning?

A

Primary, meaning HYD SYS 4 providing system pressure.

39
Q

Is antiskid protection provided during AUTOBRAKE operation?

A

Yes, of course you idiot.

40
Q

Alternate braking system simply means?

A

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

41
Q

AUTOBRAKE upon landing provides braking until?

A

Complete stop or system disarmed.

42
Q

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

A

DISARM

43
Q

Where does AUTOBRAKE selector move to during takeoff?

A

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

44
Q

What decides which HYD SYS controls braking application?

A

Pressure operated selected valves

45
Q

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

A

NO

46
Q

Difference between OFF and DISARM switch positions on AUTOBRAKE PANEL?

A
  • OFF will disarm and reset system

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

47
Q

When do AUTOBRAKES engage after touchdown?

A
  • Weight on wheels
  • Wheels spin up
  • ALL Thrust Levers CLOSED

Atlas Air B747 (24 decks)

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