Block 9: Landing Gear Systems

Define parasitic drag

Define induced drag

Define “Bogie” landing gear.

A pair (2) of wheels on this type of landing gear.

Define “Truck” landing gear.

2 pairs (4) of wheels on this type of landing gear.

Are most retractable landing gear hydraulically operated?

Most, with few GA aircrafts have electrical retractable landing gears.

When jacking an aircraft, what would happen if all jacks aren’t lifted at the same time?

You may damage the airframe due to uneven surfacing on a relatively small point.

Should the brakes be set when jacking GA aircrafts?

Generally, yes.

If the tire alignment is off, is it true that this causes drag?

Toe in/out does in fact cause increase drag.

Define what Toe in and Toe out looks like as well as chamber displacment.

“Toe in” “Toe out” (Top view)

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“Camber -” “Camber +” (Front view)

What three components make out a landing gear?

Torque links

Drag links

Trunnions and Brackets

Purpose of a “Shimmy Damper”?

A hydraulic snubbing cylinder that minimizes nose wheel shimmying (rapid vibration motion/oscillation) of the nose-wheel/tail-wheel/.

pisiton

vane

built in steerings system

The three types of shymmy dampers include:

Piston: 2 chamber and fixed metered amount

Vane: 4 chamber, adjustable timing rate, and viscosity sensitive

Built-in steerings system:

What three types of tires are common seen on GA aircrafts?

Type lll (3): For GA piston-driven aircrafts

Type Vll (7): Used for general jet aircrafts

Type Vlll (8): Used for high performance jets

What is the purpose of a chine that is on a tire?

On the side of a tire that has a curved-shaped to deflect water/slush away from engine intake or skin.

In commericial aircrafts, are repairs done to the tire(s) if there is adequate damage?

No, they are replaced entirely.