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M11 > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

What is the purpose of the Shock Strut?

A

ans. It supports the aircraft on the ground,
and protects the aircraft structure by
absorbing the shock on landing

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2
Q

In the shock strut, which acts as the spring and as the dampener?

A

ans. The compressed nitrogen gas works like a spring to absorb the shock and the hydraulic fluid has a dampening function

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3
Q

It transmits the landing gear shock loads
from the drag strut to the aircraft structure?

A

ans. Trunnion Link

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4
Q

Where does the trunnion link rotate?

A

ans. Spherical Bearings

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5
Q

What is the function of spherical bearing?

A

ans. Transmit vertical loads and drag loads into the airframe without transferring torque
to the structure and to the outer cylinder
during structural deflections

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6
Q

It permits the inner cylinder to move up and
down in the outer cylinder, but do not permit the inner cylinder to rotate in the outer cylinder?

A

ans. Torsion Links / Torque Links

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7
Q

Is used to counteract wheel shimmy and decreases the landing and takeoff vibrations?

A

Torsion Link Damper/ Shimmy Damper

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8
Q

Is used to stabilize the shock strut in the fore and aft direction during takeoff, landing and
taxiing?

A

ans. Drag Strut / Drag Stay / Drag Brace

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9
Q

It gives lateral support to the shock strut?

A

ans. Side Strut / Side Stay / Side Brace

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10
Q

It makes sure that the two parts cannot fold together when the main gear is extended?

A

ans. Gear Down lock Mechanism

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11
Q

It converts hydraulic pressure into mechanical energy to extend and retract the main gear?

A

ans. Main Gear actuator

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12
Q

The Fluid Metering Devices?

A

ans. Restricts the flow toward the end of the extension or retraction softens the extension for smooth movement.

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13
Q

It makes sure that the gear is in the down and locked position?

A

ans. Lock Strut / Lock Stay / Jury Strut

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14
Q

What is the function of the gear uplock mechanism?

A

ans. To keep the gear in an up and locked position under all flight conditions

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15
Q

When there is too much oil in the shock strut it?

A

ans. The shock strut operates harshly because oil cannot be compressed

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16
Q

When there is too much gas it?

A

ans. The result is a soft strut because gas is compressible

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17
Q

What happens to the body gears of Boeing 747 when the nose gear turns a certain angle in one direction?

A

ans. The body gear turns a smaller but proportional angle in the opposite direction

18
Q

The centerline gear gives what in the Airbus 340 and MD D1?

A

ans. It gives heavy aircraft a larger foot print

19
Q

It gives secondary support for the down and locked position of the nose gear and it controls the alignment of the folding drag strut?

A

ans. Lock Stay

20
Q

In steering when is the Steering wheels / Tillers used?

A

ans. Used the aircraft at low speeds or around narrow bends. Max of 80 degrees steering to the left or right

21
Q

In steering when is the rudder pedals used?

A

Used to steer the aircraft at high speeds like takeoff and landing. Max of 10 degrees steering to the left or right

22
Q

EWD doors are closed when the gear is extended because?

A

ans. To prevent inadvertent drag during Takeoff and Landing

23
Q

AFT Nose gear doors are?

A

ans. Open when the Nose Gear is extended

24
Q

How many levers for extension and retractions system?

A

ans. 1 Landing Gear Lever - for extension and retraction of the landing gear. 1 for Free fall extension system but only for extension

25
Q

What are the conditions for Retraction?

A

ans. The Aircraft is in flight and The nose gear are centered

26
Q

What is System 1 in Indirect nose wheel steering system?

A

ans. Mechanical Operated andHydraulically Actuated

27
Q

What is System 2 in Indirect nose wheel steering system?

A

ans. Electrically Operated and Hydraulically Actuated

28
Q

When is Two Jack method used as actuation?

A

ans. Mechanically operated system (System 1)

29
Q

When is the Rack and Pinion method used as actuation?

A

ans. Electrically operated system (System 2)

30
Q

What are the valves used for servicing the shock strut with nitrogen and hydraulic fluid?

A

ans. Air charging valve and oil charging valve

31
Q

When does the centering cams engage?

A

ans. the inner cylinder extends to make sure that the nose gear is in a straight and forward position during retraction

32
Q

Purpose of the Landing Gear Control Interface Unit?

A

ans. Sends control to the selector valves and the selector valves control the extension and retraction of the gears and movement of the doors

33
Q

It reduces the tire heating at high temperatures and it releases the tire pressure when temperature increases?

A

ans. Fusible Plugs / Thermal Relief Plug

34
Q

How is the life span of tires calculated?

A

ans. Calculated on the numbers of take-offs and landings. Tires can be used for approximately 150 - landings and take-offs

35
Q

Tires are inflated with?

A

ans. Nitrogen

36
Q

During landing what happens at the Kinetic Energy?

A

ans. Kinetic Energy is converted to Heat Energy

37
Q

It protects the tire and provide more efficient braking?

A

ans. Anti-skid System

38
Q

It limits the applied braking on our tires based on relative aircraft speed and ground conditions

A

ans. Anti-skid System

39
Q

How si the Parking brake system used when the all the brake systems are de-pressurized?

A

ans. We use Brake accumulator

40
Q

This brake stops the rotation of the wheels during the retraction of the gears?

A

ans. In-Flight Brake

41
Q

It stops the aircraft at the selected deceleration level without pilots touching the brake pedals?

A

ans. Auto Brake System.

42
Q

Speed brakes automatically extend when the aircraft touches down so

A

ans. Auto Braking is activated by the extension of the speed brakes

M11 (14 decks)

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