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AGK Systems ATPL > Chapter 6 - Landing Gear > Flashcards

Chapter 6 - Landing Gear Flashcards

1
Q

Landing Gear Types?

A

Rubber Bungee

Cantilever Spring

Oleo Pneumatic Strut

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2
Q

Rubber Bungee

A
  • Use Tubular Struts

- Landing forces directed against the turns in the rubber.

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3
Q

Cantilever Spring

A
  • Comprises a tube or strip of tapered spring steel.

- Upper end is attached to the fuselage and the lower end terminates at the axle.

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4
Q

Oleo Pneumatic Strut

A
  • Found on more advanced light aircraft.
  • Combination of air and Hydraulic fluid is used to absorb the shock during landing.
  • Often just the Nose gear that uses this.
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5
Q

Wheel Bogie?

A
  • Used to fit additional wheels to the landing gear.
  • At least 4 wheels per landing leg.
  • Mounted to a ‘bogie beam’.
    Requires a large amount of space to stow.
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6
Q

Shock Absorbers?

A

90% of landing shock.
Connected to the wing spars.

  • Gas (Nitrogen) inside cylinder acts as spring to absorb loads.
  • Hydraulic oil acts to dampener the gas springs during rebound.
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7
Q

Preflight check that should be carried out on the Shock Absorbers?

A

Fescalized Portion should be checked to see if it has bottomed out:

  • Sign of low pressure
  • or Fluid leak.
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8
Q

Purpose of:

Oleo Leg

A

Absorbs loads and dampens recoil

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9
Q

Purpose of:

Wheel Axles

A

Wheel mounting shaft, allows rotation.

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10
Q

Purpose of:

Bogie

A

Axles connected by a central bogie beam to support complete wheel assembly.

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11
Q

Purpose of:

Drag Strut

A

Braces the landing gear against the forward & rear shock loads.

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12
Q

Purpose of:

Upper Sidestay

A

Braces the landing gear against side motion (Taxing creates the biggest loads of the sides).

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13
Q

Purpose of:

Gear Doors

A

Provide aerodynamic closure to the landing gear bay.

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14
Q

Purpose of:

Torque Link (Scissor Link)

A

Prevents rotation of the inner oleo cylinder.

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15
Q

Purpose of:

Free Castoring?

A

Uses wheel brakes to turn the aircraft

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16
Q

Purpose of:

Automatic Self-centring springs / Centring Cams?

A

Ensure the wheel is centred when retracting.

Won’t knock on the structure and cause damage.

17
Q

What is VLE?

A

Max speed at which landing gear may be extended.

18
Q

What is meant by VLO?

A

Max speed at which the landing gear may be “Operated”.

19
Q

Type of locks used to lock Landing gear?

A
  • Geometric
  • Over centre locking.

Requires no hydraulic pressure to lock the gear into position.
Uses gravity.

REQUIRES HYDRAULIC ACTUATOR TO BREAK THE LOCK TO RETRACT.

20
Q

What is a ‘Up-lock’?

A

Hook lock which requires hydraulic pressure to engage and release.

21
Q

What are ‘Ground Locks’?

A

Manually fitted Ground Locks when aircraft is parked.
- Prevent inadvertent movement of the gear.
- Put in place before towing.
Have a red tag attached.

FORGETTING TO REMOVE THESE WILL LEAD TO FAILURE OF RETRACTION.

22
Q

Green Gear light means?

A

Locked.

23
Q

Red Gear light means?

A

Unlocked and traveling.

24
Q

No Gear lights mean?

A

Locked and up.

25
Q

Dolls-eye?

A

System used to indicate gear position.

Magnetic.

26
Q

Ways to lower gear in emergency?

A
  • Hand Cranked
  • Compressed Nitrogen to blow the gear down - Cannot be retracted after gas is dispelled.
  • Gravity or free fall system. Releases the up-locks.
27
Q

What is a Tiller used for?

A

Manoeuvring on the ground at low speeds.
75degrees of rotation.
Operated by a small electric or hydraulic motor.

28
Q

What can cause ‘Shimmy’?

A
  • Worn or broken torque links.
  • Wear in the wheel bearings.
  • Low or uneven tyre pressure.
29
Q

Shimmy Prevention?

A
  • Hydraulically locking steering pistons.
  • Hydraulic Dampeners.
  • Self Centring Springs.
  • Double Nose Wheels.
  • Nose wheel tyres with 2 contact points known as ‘Marstrand Tyres’.
30
Q

Redundancy procedure for landing gear lights?

A

2 light bulbs.

AGK Systems ATPL (8 decks)

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