11.13 Landing gear Flashcards

1
Q

What are the advantages of a nose tricycle gear system over a tail system?

A
  • Directional stability
  • Higher landing speeds (better braking ability)
  • Greater decrease in lift after touchdown (less AOA on wings)
  • Better visibility during takeoff and landing
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2
Q

What type of undercarriage will give a larger footprint?

A

Multiple bogies

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3
Q

What part of the undercarriage supports the aircraft weight?

A

The shock strut

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4
Q

What function does the gas fulfil in a shock absorber?

A

It acts as the spring to absorb the shock

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5
Q

What characteristics will a shock absorber display if it is overfilled with oil?

A

It has harsh operation (insufficient spring)

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6
Q

What two internal components of a shock absorber provide damping during extension?

A
  • Laminar flow orifice

- Tapered metering pin

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7
Q

What component will transfer vertical load to the airframe without impacting torque?

A

Spherical bearing

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8
Q

What is the purpose of angling the nose gear leg forward of vertical?

A

Nose wheels castor to centre

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9
Q

How is landing gear prevented from lowering in high speed?

A

A mechanical lock or speed signal which causes a safety valve to isolate the hydraulics

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10
Q

When will the autobrake system disengage?

A

When the pilot uses the brakes

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11
Q

What is the principle of operation if a wheel speed transducer?

A

It converts the rotational speed of the wheel into an electrical signal

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12
Q

What component will close if the brake line pressure differential gets too high?

A

The hydraulic fuses

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13
Q

What effect will thrust reverse have on the auto braking system?

A

The auto brake will reduce brake pressure to keep the pre-selected deceleration rate

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14
Q

When would a flat spotted tyre require changing?

A

When there is shimmy on braking or it’s worn to limits

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15
Q

What is the purpose of the drive keys on a wheel?

A

So the wheel can drive the brake discs

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16
Q

The landing gear shortening mechanism will do what?

A

Shorten the main gear for retraction into the wheel well

17
Q

What is the cockpit indication that all landing gear is stowed and locked?

18
Q

How is nose wheel steering achieved on a large commercial aircraft?

A
  • By the use of a steering tiller that sends electrical signals to a hydraulic steering control valve
  • By the use of a steering tiller to mechanical linkages to a hydraulic steering valve
19
Q

How can undercarriage retraction tests be carried out on 1 leg only?

A

By leaving downlock pins in position

20
Q

Which part of an undercarriage leg ensures it remains down and locked?

A

Down lock mechanism (geometric lock and actuator)

21
Q

Which part of an undercarriage leg absorbs the load on landing?

A

The shock strut

22
Q

What are the component parts of a heat stack in the braking system?

A

Rotors and stators

23
Q

On a power braking system, what component ensures demand is met at the unit?

A

The brake metering valve

24
Q

The support strut of the undercarriage carries what load?

A

The weight

25
How is damage to the steering mechanism prevented when towing?
Bypass valve
26
How is the undercarriage leg held in the up position?
By the use of an up lock
27
In which direction do the plies of a conventional tire run?
Cord plies run diagonally
28
Why is there a minimum turning radius applied to aircraft during towing or taxiing?
To prevent damage to the undercarriage and tires
29
What is the purpose of the torque link on an undercarriage leg?
They permit the inner cylinder to move up and down in the outer cylinder but prevent it turning
30
Apart from the lock pins, what else prevents the undercarriage from retracting on the ground?
The landing gear selector cannot be selected up without overriding the lever lock
31
What would occur if the anti-skid system detects a locking wheel?
A full release signal is sent to the brakes by the locked wheel sensor allowing the wheel to rotate. The skid detection system can then regulate the braking again
32
What is the position of the main undercarriage doors once the main undercarriage has been extended?
Normally closed
33
Why should a wheel be deflated before removing from the axle?
To prevent high pressure splitting of the wheel
34
What would occur if a wheel assembly was subject to an overheat situation?
Fusible plugs would melt
35
In which direction should a wheel be approached for servicing?
In front or behind