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AIRFRAME
J AIRCRAFT LANDING GEAR SYSTEMS
| Question | Answer |
|---|---|
| What is the purpose of a torque link on an oleo strut? | What is the purpose of a torque link on an oleo strut? |
| A landing gear shock strut should be inflated with what gas(es)? | Nitrogen or dry air |
| What conditions should a mechanic look for during a regular inspection of the exposed piston section of a landing gear? | Cleanliness, evidence of damage, and proper extension. |
| What prevents air from leaking out between the two halves of a split wheel assembly? | An O-ring. |
| Why are fusible plugs installed on some aircraft wheels? | To release the pressure generated by heat build-up before a tire blows. |
| What safety precaution must be taken when removing a wheel from an axle or when disassembling a wheel? | Verify that the tire is completely deflated before removing a wheel from an axle or before wheel disassembly. |
| What are the visible signs of excessive heating on a wheel bearing? | The bearing surfaces show discoloration. |
| How are the pilot's nose wheel steering commands transmitted to the steering control unit of a large aircraft? | Steering signals may be transmitted mechanically, electrically, or hydraulically. |
| How is the nose wheel steering mechanism usually actuated on a small aircraft? | By means of a mechanical linkage connected to the rudder pedals. |
| What is the name of the unit that prevents a nose wheel from vibrating or oscillating? | A shimmy damper |
| What are the most common sources of power used to extend and retract landing gear? | Hydraulic pressure and electric motors. |
| At what times should a gear retraction check be performed? | During annual or other inspections and following a hard landing. |
| What mechanism(s) ensure that a nose wheel is not turned as it retracts into its wheel well? | Internal centering cams in the strut or an external track. |
| Name several types of brake actuating systems. | Independent master cylinders, boosted brakes, and power-controlled brakes. |
| What is the function of an anti-skid system? | Anti-skid systems allow large aircraft to achieve maximum braking effectiveness without allowing wheels to skid or lock. |
| What is the purpose of a DE booster? | To reduce hydraulic system high pressure to a lower value for more satisfactory brake action. |
| Describe two methods of bleeding brakes. | A pressure pot can be attached to the bleeder valve and fluid forced back towards the master cylinder and/or reservoir, or the master cylinder can be used for forcing fluid from the reservoir to the brakes. |
| Before a brake system can be inspected for leaks, what action must be accomplished? | Pressure must be applied to the system. |
| What maintenance function has the greatest impact on tire service life? | Ensuring that the tires are properly inflated. |
| What effect(s) does under-inflation have on aircraft tires? | Internal heat damage possibly leading to premature tire failure, and more tread wear on the shoulders than in the center. |
Created by:
S_A_J