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Atlas Air B747 April 2022 > Landing Gear & Brakes *** > Flashcards

Landing Gear & Brakes *** Flashcards

1
Q

Describe the OFF position of the landing gear.

A

• Landing gear hydraulic system is depressurized.

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2
Q

How many degrees can the nose-wheel steering system turn the nose gear with the tiller, and how many degrees with the rudder pedals?

A
  • 70 degrees in either direction with the tiller

* 7 degrees with the rudder pedals

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3
Q

When does RTO apply maximum brake pressure?

A
  • Airplane on the ground
  • All 4 thrust levers are closed, and
  • Above 85 knots.
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4
Q

What does the BRAKE SOURCE amber light indicate when illuminated?

A

• Active brake hydraulic sources (hydraulic systems 4, 1, and 2) have low pressure

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5
Q

What does a white, crosshatched, expanded gear position indication mean?

A

• Respective landing gear in transit

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6
Q

What does an amber X display on an expanded gear position mean?

A

• Landing gear position indicator inoperative

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7
Q

What does a white empty box on the Gear synoptic display indicate?

A

• Respective landing gear door position indicators inoperative

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8
Q

What sensing systems control in flight and ground operation of various airplane systems?

A
  • Air/ground sensing system

* Nose gear extension sensing system

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9
Q

How does the airplane distinguish between air mode and ground mode?

A

• A combination of main gear tilt sensors

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10
Q

Nose gear extension sensing provides a signal to relays controlling functions
in which systems?

A
  • Stall warning

* Nose gear steering

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11
Q

What conditions must be satisfied in order for the landing gear lever lock to release?

A
  • Main gear are tilted

* Body gear centered

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12
Q

Describe the sequence of events when the landing gear lever is moved UP.

A
  • The landing gear doors open
  • Automatic braking occurs
  • Landing gear begin to retract.
  • EICAS gives related indications
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13
Q

How are the landing gear held in position after retraction?

A
  • Main gear are held in the up position by uplocks

* The nose gear is mechanically locked in the up position.

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14
Q

During landing gear extension, state what happens if any gear position disagrees with lever position after normal transit time.

A

• The EICAS changes to the expanded non-normal format
• Affected gear displayed as in transit, or UP if the gear never unlocked
from the up position.

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15
Q

How does the gear extend through the alternate gear extension system?

A
  • By pushing the Alternate Gear Extend switches
  • The gear uplocks and gear door latches are electrically released.
  • The gear free-falls
  • Gravity and air loads extend the gear
  • Springs pull the downlocks into the locked position
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16
Q

When does body gear steering operate?

A

• When the nose wheel steering angle exceeds 20 degrees

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17
Q

When is body gear steering activated and when is it deactivated?

A
  • Activated Ground speed decreasing through 15 knots

* Deactivated Ground speed increasing through 20 knots

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18
Q

What is the purpose of the brake accumulator?

A

• Provides parking brake application

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19
Q

Describe the difference between normal and alternate anti-skid braking systems.

A

• Normal brake antiskid provides each main gear wheel with individual
antiskid protection.
• Alternate brake antiskid provides antiskid protection to lateral wheel pairs
(forward and/or aft pair on each truck), rather than to individual wheels

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20
Q

How does the brake torque limiter function in the Alternate brake system?

A
  • Brake torque is sensed on an individual wheel basis.
  • Signal sent to alternate anti-skid valve.
  • Brake pressure is released on a laterally paired wheel basis.
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21
Q

When do the auto brakes apply after landing?

A
  • All thrust levers are closed
  • Ground mode sensed
  • The wheels have spun up
22
Q

Which systems contribute to total airplane deceleration on landing and reduces autobrake pressure?

A
  • Thrust reverse

* Spoilers

23
Q

Give examples of what would disarm the autobrakes after landing.

A

• Pedal braking applied
• Any Thrust lever advanced after landing
• Speedbrake lever moved to DOWN detent after speedbrakes have been
deployed on the ground
• DISARM or OFF position selected on the Autobrakes selector
• Autobrake fault
• Normal antiskid system fault
• Loss of normal hydraulic pressure

24
Q

What hydraulic system pressurizes the brake accumulator?

A

• System 4

25
Q

Can the airplane be stopped with normal accumulator pressure?

A

• No, the accumulator is not designed to stop the aircraft.

26
Q

Why is it necessary to pressurize hydraulic system 4 before pressurizing the other systems?

A

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

27
Q

What provides automatic brake source selection?

A

• Pressure-operated selector valves

28
Q

What value on the brake temperature monitoring system causes the BRAKE TEMP Advisory EICAS message to appear?

A

• 5

29
Q

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

A

No, only primary.

30
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
31
Q

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

A

Expanded gear position indication.

32
Q

Nosewheel and body gear steering HYD SYS?

A

HYD SYS 1

33
Q

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

A

Hydraulically centered

34
Q

Do nose wheel have brakes installed?

A

NO

35
Q

Normal braking HYD SYS?

A

HYD SYS 4

36
Q

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

A

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

37
Q

Placing AUTOBRAKES selector in DISARM does what?

A
  • Disengages autobrake
  • Releases brake pressure
38
Q

Brake temp values on EICAS range from?

A

0 to 9

39
Q

With regards to gear position indications, white crosshatch means?

A

In transit

40
Q

AUTOBRAKES are only available when what braking system is functioning?

A

Primary, meaning HYD SYS 4 providing system pressure.

41
Q

Is antiskid protection provided during AUTOBRAKE operation?

A

Yes,

42
Q

AUTOBRAKE upon landing provides braking until?

A

Complete stop or system disarmed.

43
Q

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

A

DISARM

44
Q

Where does AUTOBRAKE selector move to during takeoff?

A

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

45
Q

What decides which HYD SYS controls braking application?

A

Pressure operated selected valves

46
Q

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

A

NO

47
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.
48
Q

When do AUTOBRAKES engage after touchdown?

A
  • Weight on wheels
  • Wheels spin up
  • ALL Thrust Levers CLOSED
49
Q

What does it mean when the Brake Source light is illuminated on the Captain’s panel?

A

Active brake source (Hydraulic systems 4, 1 and 2) have low pressure

50
Q

What is the difference between the normal and alternate brake systems?

A

Normal system operates off hydraulic system 4. Autobrakes and full anti-skid is available.

The alternate system operates off hydraulic system 1(if 4 fails) then 2 (if 1 fails). Anti-skid is reduced to pairs of wheels and autobrakes are not available.

51
Q

Can I select autobrakes when hydraulic system 1 is the active brake source?

A

No

52
Q

Above what ground speed does the RTO function become available?

A

85 knots

Atlas Air B747 April 2022 (41 decks)

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