Landing Gear Flashcards
A landing gear shock strut should be inflated with what gas
Nitrogen or dry air
What condition should an 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 before a tire blows
What safety precaution must be taken when removing a wheel from an axle or when disassembling a wheel
Tire is completely deflated
What are the visible signs of excessive heating on a wheel bearing
Discoloration
How are the pilots nose wheel steering commands transmitted to the steering control unit of a large aircraft
Mechanically , electrically, or hydraulically
How is the nose wheel steering mechanism usually actuated on a small aircraft
By a mechanical linkage connected to the rudder pedals
What is the name of the unit that prevents a nose wheel from vibrating or oscillating
Shimmy damper
What are the most common sources of power used to extend and retract landing gear
Hydraulic pressure and electrical motors
At what times should a gear retraction check be performed
During annual or other inspections and following a hard landing
What mechanisms ensure that a nose wheel is not tuned as it retracts into the wheelwell
Internal centering cam
Name several types of brake actuating systems
Independent, power boosted, and power control type
What is the function of an anti skid system
Allow large aircraft to have maximum braking effectiveness without allowing wheels to skid or lock
What is the purpose of a debooster
To reduce hydraulic system high pressure to a lower value for more satisfactory brake action
What are two methods of bleeding brakes
Gravity and pressure
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
Tires are properly inflated
What affects 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
What type of care should be given to landing gear shock struts
Inspect regularly for leakage of fluid and proper extension. Exposed portion of the strut should be wiped clean daily and inspected for scoring or corrosion
What is the purpose of a shuttle valve in a power control system
Used to isolate the emergency brake system frm the normal brake system
When inspecting brakes what do you look for
- Check for leaks while system is
- Check flex hoses for swelling, cracking or soft spots
- Check brake pedal for spongy feeling ( indicates air in the system)
- Check brake pedals for excessive travel ( indicates worn linings)
What do you do before disassembling an oleo strut
Discharge the pressure
What is the purpose of a torque link on an oleo strut
To keep the wheel in alignment and prevent the piston from coming out of the cylinder
