Landing Gear

Landing Gear• What are three advantages of a

tricycle landing gear over a tail-wheel type landing gear?

Landing Gear• It allows more forceful application

of the brakes without the danger of nosing the aircraft over

• It permits better visibility for the pilot during ground operations

Landing Gear• It prevents the tendency for the

aircraft to ground loop.

Landing Gear• What is the name of the landing

gear that has more than two wheels mounted on a single strut?

• A bogie landing gear

Landing Gear• What is the function of the drag

strut in a retractable landing gear?

Landing Gear• The drag strut braces the

landing gear against fore-and-aft movement of the wheel, and it hinges in its middle to allow the landing gear to be retracted into the aircraft structure.

Landing Gear• What are the two most commonly

used methods of actuating a retractable landing gear?

• Electric Motor• Hydraulic Cylinder

Landing Gear• Gear Position Indicators

–Red light–One or three green lights–Press to test

Landing Gear• What are four methods of

emergency extension of a retractable landing gear?

Landing Gear• Hand crank• Designed so it will free fall and

lock down mechanically• Hydraulic pressure can be built

up by a hand pump

Landing Gear• Actuated with compressed air

from a storage cylinder

Landing Gear• Maximum landing gear

extended speed VLE

• Maximum landing gear operating speed VLO

Landing Gear

• What is the commonly used name for the landing gear safety switch that is located on the torque links?

• A squat switch

Landing Gear• Explain when you would retract

the gear after takeoff?

Landing Gear• Explain when you would retract

the gear after takeoff?• Two positive rates of climb and

once there is no more runway available for landing in front of the airplane

Landing Gear• What is the function of the

warning horn in a retractable landing gear system?

Landing Gear• The horn sounds to warn the

pilot that the throttles are closed to the position for landing of the aircraft if the landing gear is not down and locked. It is different from the stall warning horn.

Landing Gear• How is nosewheel steering

accomplished on a light aircraft?

Landing Gear• Most light aircraft have some

form of direct linkage between the nose-wheel and the rudder pedals that allow the nose-wheel to be steered when the aircraft is on the ground.

Landing Gear• How is nose-wheel steering

accomplished on a heavy aircraft?

Landing Gear• The nose-wheels of most heavy

aircraft are steered with hydraulic actuators that are controlled by moving a small wheel that is turned by the pilot.

Landing Gear• What is the function of the

shimmy damper that is used on a tricycle landing gear?

Landing Gear• The shimmy damper restrains

the movement of the nose-wheel. It allows the wheel to be steered by moving it slowly, but does not allow the wheel to move back and forth rapidly.

Landing Gear• Why do modern high-

performance aircraft use several small wheels rather than fewer large wheels on their landing gear?

Landing Gear• Small wheels spread the weight

of the aircraft over a larger area• Several smaller wheels give a

margin of safety in case one tire should fail

Landing Gear• Small wheels and tires are

easier to house in the aircraft structure than large ones

Landing Gear• What is indicated by a tire

wearing on the shoulder of the tread more that in the center of the tread?

Landing Gear• What is indicated by a tire

wearing on the shoulder of the tread more that in the center of the tread?

• The tire has been operated under-inflated

Landing Gear• How soon after landing should

aircraft tires be checked for proper inflation?

Landing Gear• No sooner that two hours after

the aircraft has landed. The correct inflation pressure in a tire is the pressure when the tire is cold.

Landing Gear• Why is it important that the

tread of a tire not be allowed to wear to the point that water cannot pass under the tire?

Landing Gear• If water cannot pass under the

tire, the airplane is likely to hydroplane or skid on wet runways?

Landing Gear• What is one of the main

dangers of operating a tubeless tire in an underinflated condition?

Landing Gear• When the tire is operated in an

underinflated condition, the cords flex and generate enough heat to damage the tire.

Runway Weight Bearing Capacity

• Salina–RWY 17-35 S-75 D-200 DT-360

DDT-600–RWY 12-30 S-55 D-68 DT-125–RWY 04-22 S-75 D-80 DT-200

Runway Weight Bearing Capacity

• S - Single Wheel type landing gear DC-3

• D - Dual wheel type landing gear DC-6

• T - Twin wheel landing gear DC-6

Runway Weight Bearing Capacity

• ST - Single-tandem type landing gear C-130

• SBTT - Single-Belly Twin Tandem landing gear KC-10

• DT - Dual-tandem type landing gear B707

Runway Weight Bearing Capacity

• TT - Twin-tandem type (includes quadricycle landing gear B-52 C-135

• TRT - Triple-tandem landing gear C-17

Runway Weight Bearing Capacity

• DDT - Double dual-tandem landing gear B747

• TDT Twin delta-tandem landing gear C-5