Answers - Landing Gear Systems

Fill in the Blanks

1. tail wheel , tandem , tricycle landing gear
2. fairings, wheel pants.
3. spring steel, aluminum, composite materials.
4. torque links, torque arms
5. locating cam assembly (centering cam)
6. camber
7. powerpack
8. emergency extension system
9. landing gear retraction test, swinging
10. shimmy damper
11. thermal plugs
12. torqued
13. lack of lubrication, bluish
14. excessive impact, indentations
15. top, right

True or False

1. false; most use a nosewheel steering system
2. true
3. false; filled with nitrogen and hydraulic fluid.
4. false; nitrogen in the tires and the shock strut combine to smooth out bumps.
5. true
6. true
7. false; hydraulic pressure
8. true
9. false; on high performance; not small single engine aircraft
10. false; being down and locked
11. true
12. false; modern aircraft use two piece wheels
13. false; inner halves have provisions for brake rotors.
14. true; if the wheel bolts have failed the axle nut could be the only thing that keeps the wheel halves together.
15. true

Knowledge Application

1. Dry air or nitrogen, and hydraulic fluid.
2. Clean and inspect for damage and proper extension.
3. They keep the main landing gear wheels pointed in a straight ahead direction.
4. Hydraulic, or electrical.
5. A simple system consisting of mechanical linkage hooked to the rudder pedals.
6. A shimmy damper or in large aircraft using power steering the power steering actuators provide the dampening.
7. They reduce the pressure to the brakes and increase the volume of fluid flow.
8. Independent, power boost, and power control.
9. Pressurize the system.
10. A rubber O‐ring between the two wheel halves.

Multiple Choices

1. b
Tires should be stored in a cool, dry area, out of direct sunlight and away from electrical machinery (which may generate ozone). Special care should be taken to avoid contact with hydrocarbon compounds (petroleum products).

2. c
When the brake pedal is released, the master cylinder piston is returned to the OFF position by a return spring. If the spring were broken, the piston would not return and some pressure could stay in the system. This would cause the brakes to drag.

3. c
Bleeding brakes is for the purpose of getting air out of the system which could cause spongy and ineffective brakes. Bleeding is accomplished by forcing fluid out of the system under pressure, which takes the air out of the system at the same time.

4. a
Some shock struts are equipped with a damping or snubbing device consisting of a recoil valve on the piston or recoil tube, to reduce the rebound during the extension stroke, and to prevent too rapid an extension of the shock strut.

5. b
The most likely cause of spongy brake action is air in the system. If air is found, it must be removed in order to restore proper braking action.

6. c
A common type of parking brake is one that operates by depressing the brake pedals and pulling a parking brake handle, which locks the brakes in a depressed position with a ratchet mechanism. If the master cylinder piston has a faulty seal and allows fluid to pass by it, the brakes will release even though the pedals are still held depressed.

7. b
When inflating a tire in which a new tube has just been installed, put the tire in a safety cage and gradually bring the air pressure up to the recommended value to seat the beads and then deflate the tire. Then reinflate the tire to the correct pressure. This inflation, deflation, and re-inflation procedure allows the tube to straighten itself out inside the tire.

8. a
Most shock struts employ a metering pin for controlling the rate of fluid flow from the lower chamber into the upper chamber. During the compression stroke, the rate of fluid flow is not constant, but is controlled automatically by the variable shape of the metering pin as it passes through the orifice.

9. a
After working on the gear retraction system of an aircraft in such a way that the proper operation of the system could be affected, it is absolutely essential that a retraction test be performed on the gear. One can rest assured that the aircraft maintenance manual will require a retraction test in such an instance.

10. b
A maintenance technician should always be sure to deflate tires completely before demounting. It is also recommended that tires be deflated before wheels are removed from the aircraft. With split rim wheels, there is always a possibility of the rim separating when the tire is under pressure.

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