Jeppesen Oral- Chapter 9 ( Aircraft Landing Gear) Flashcards
What takes up the sucks of the landing impact in an oleo shock strut?
The metered transfer of oil from one compartment to another inside the shock strut
What takes up the taxi shocks in an oleo shock strut?
Compressed air
How much oil should be put into an oleo shock strut?
deflate the strut completely, remove the filler plug, and fill the strut with oil to the level of the filler plug.
What is the purpose of the centering cam in a nosewheel shock strut?
The centering cam forces the nosewheel to align with the strut before it is retracted into the nosewheel well
How does the shimmy damper keep a nosewheeel from shimmying?
It acts as a small hydraulic shock absorber between the piston and the cylinder of the nosewheel shock strut.
What is the purpose of the debooster in a hydraulic power brake system?
The debooster decreases the pressure and increases the volume of liquid going to the brakes. This gives the pilot better control of the brakes.
What should be done to hydraulic brakes when the pedal has a spongy feel?
The spongy feel is caused by air in the brakes. The brakes should be bled of this air.
What is used in a split wheel to keep air from leaking between the two wheel halves?
An O-ring seal
What causes an aircraft tire to wear more on the shoulders than in the center of the tread?
Operating the tire in an underinflated condition
What causes an aircraft tire to wear more in the center of the tread than on the shoulders?
Operating the tire in an overinflated condition
What should be done to an aircraft tire if the sidewalls are weather-checked enough to expose the cord?
The tire should be scrapped.
Why is it important that some aircraft with retractable landing gear be given a retraction test after new or retreaded tires are installed?
t is possible in some aircraft that a new or retreaded tire can be enough larger than the precious tire that it could lock up in the wheel well when the landing gear is retracted
How is the correct amount of air in an oleo shock strut determined?
By the amount the strut extends out of the cylinder when the weight of the aircraft is on it
What should be done with a tire what was on a wheel which was overheated enough to melt the fusible plug in the wheel?
The tire should be scrapped
Where can you find the correct inflation pressure for the tires on an aircraft?
MM
What is the purpose of the compensator port in the master cylinder of aircraft brakes?
The compensator port in the master cylinder opens the brake reservoir to the wheel cylinders when the brakes are off. This prevents pressure from building up in the brake lines and causing the brakes to drag.
What is the purpose of the shuttle valve in the brake system of an aircraft using hydraulic power brakes?
The shuttle valve is an automatic transfer valve. It allows the brakes to be operated by hydraulic system pressure under all normal conditions, but if this pressure is lost, it allows the brakes to be operated by the emergency backup system.
How does an antiskid brake system keep the wheels of an aircraft from skidding on a wet runway?
The antiskid system monitors the rate of deceleration of the wheels. If any wheel shows down faster than it should (as it would at the beginning of a skid), the pressure on the brake in that wheel is released until the wheel stops decelerating, the the pressure is reapplied.
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.
What conditions should a mechanic look for during a regular inspection of the exposed section of a landing gear?
cleanliness, evidence of damage, and proper extension
What are the visible signs of excessive heating on a wheel bearing?
The bearing surfaces show discoloration
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
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 purpose of a debooster?
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.
