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AIRCRAFT LANDING GEAR SYSTEM

Excessive wear in the shoulder area of an aircraft tire is an indication of

Overinflation

Excessive toe-in

Underinflation

How long should you wait after a flight before checking tire pressure? NANCE

At least 2 hours (3 hours in hot weather)

At least 3 hours (4 hours in hot weather)

At least 4 hours (5 hours in hot weather)

Aside from an external leak in the line, what will cause parking brakes to continually bleed off pressure?

An internal leak in the master cylinder

Insufficient hydraulic fluid in the reservoir

Glazed brake linings

The purpose of an orifice check valve is to

Relieve pressure to a sensitive component

Restrict flow in one direction and allow free flow in the other

Relieve pressure in one direction and prevent flow in the other direction

Aircraft brakes requiring a large volume of fluid to operate the brakes generally

Use independent master cylinder systems

Do not use brake system accumulators

Use power brake control valves

Lockout deboosters are primarily pressure reducing valves that

Allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber

Cannot allow full debooster piston travel without fluid from the high pressure side entering the low pressure chamber

Must be bled separately after brake bleeding has been completed

What would be the effect if the piston return spring broke in a brake master cylinder?

The brakes would become spongy

The brake would become excessive

The brakes would drag

What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system?

A bypass valve

An orifice check valve

A shuttle valve

Instructions concerning the type of fluid and amount of air pressure to be put in a shock strut are found

On the airplane data plate

In the aircraft operations limitations

In the aircraft manufacturer's service manual

The metering pin in oleo shock struts serve to

Lock the struts in the DOWN position.

Retard the flow of oil as the struts are composed.

Meter the proper amount of air in struts.

On an air valve core stem, what indicates high-pressure type?

An embossed letter 'NP'

An embossed letter 'HP

An embossed letter 'H'

The purpose of a relief system valve in a brake assembly system is to

Reduce pressure for break application

Prevent the tire from skipping

Compensate for the thermal expansion

In shock struts, chevron seals are used to

Absorb bottoming effect

Prevent oil from escaping

Serve as a bearing surface

The left brake is dragging excessively on an airplane on which no recent brake service work has been performed. The most probable cause is.

Foreign particles stuck in the master cylinder compensating port.

Excessively worn brake linings.

Low fluid supply in the brake system reservoir.

A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a

Slippage mark.

Wheel-to-tire balance mark

Wheel weight reference mark

Chines are used on some aircraft nose wheel tire to help

Nose gear extension at higher air speeds

Reduce the possibility of hydroplaning

Deflecting water away from the fuselage.

An electric motor used to raise and lower a landing gear would most likely be a

Shunt field series-wound motor.

Split field shunt-wound motor.

Split field series-wound motor.

What device in a hydraulic system with a constant-delivery pump allows circulation of the fluid no demands are on the system?

Pressure relief valve.

Shuttle valve

Pressure regulator

A hydraulic system referred to as a 'power pack' system will

Have an engine-driven pump for greater pressure

Have all hydraulic power components located in one circuit

Have a pressurized reservoir.

What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut?

Limit compression stroke.

Hold the strut in place.

Maintain correct wheel alignment.

Debooster valves are used in brake system primarily to

Ensure rapid application and release of the brakes

Reduce brake pressure and maintains static pressure.

Reduce the pressure and release the brakes rapidly.

In brakes service work, the term 'bleeding brakes' is the process of

Withdrawing air only from the system

Withdrawing fluid from the system for the purpose of removing air that has entered the system.

Replacing small amounts of fluid in reservoir.

Extension of an oleo shock strut is measured to determine the:

Amount of oil in the strut.

Physical condition of the strut itself

Proper operating position of the strut.

Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation?

Single-disk spot type.

Single-servo type.

Expander-tube type.

Debooster cylinders are used in brake systems primarily to:

Reduce brake pressure and maintain static pressure.

Relieve excessive fluid and ensure a positive release.

Reduce the pressure to the brake and increase the volume of fluid flow.

What condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump in operating?

Accumulator air pressure low

Inadequate supply of fluid

System relief valve sticking closed

If an airplane equipped with master cylinders and single-disk brake pedal travel, but the brakes are hard and effective, the probable cause is

The master cylinder one-way cup is leaking

Worn brake linings

Worn brake disk causing excessive clearance between the notches on the perimeter of the disk and the splines or keys on the wheel

A flexible hydraulic hose identified as MIL-H-8788 will have a stripe running the length of the hose. The stripe

Is used to ensure that the hose is installed without excessive twisting

Identifies that the hose is for high pressure fluids, with a 60 degree flexing range

Identifies that the hose is constructed of Teflon and is suitable for a wide temperature range

An automatic damping action at the steering damper if for any reason the flow of high-pressure fluid is removed from the

Outlet of the steering damper

Inlet of the steering damper

Replenishing check valve

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (300 psi) is used to operate brakes

That are designed to work with lower pressure

That are used in conjunction with an antiskid system

That are used on aircraft having high landing speeds

The repair of an out-of-tolerance toe-in condition of main landing gear wheels determined not to be the result of bent or twisted components consists of

Shimming the axle in the oleo trunnion

Inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissors torque links

Placing shims or spacers behind the bearing of the out-of-tolerance wheel or wheels.

If the extended longitudinal axis of the main landing gear wheel assemblies in intersects aft of the aircraft, the wheels can be termed as having

Toe-out

Toe-in

Negative amber

An O-ring intended for use in a hydraulic system using MIL-H5606 (mineral base) fluid will be marked with

A blue striper or dot

One or more white dots.

A white and yellow stripe.

When an empty shock strut is filled with fluid, care should be ta to extend and compress the strut completely at least two times to

Thoroughly lubricate the piston rod

Force out any excess fluid

Ensure proper packing ring sealing and removal of air bubbles.

When installing a chevron-type seal in an aircraft hydraulic cylinder, the open side of the seal should face

Opposite direction of fluid pressure

Up or forward when the unit is installed in a horizontal position

The direction of fluid pressure.

Internal leakage in a brake master cylinder unit can cause a Fading brakes cause

Fading brakes

Slow release of brakes

The pedal to slowly creep down while pedal pressure is applied.

Why do most aircraft tire manufacturers recommend that the tubes in newly installed tire must be first inflated, fully deflated and the re-inflated to the correct pressure?

To allow the tube to position itself correctly, TENA inside the tire.

To eliminate all the air between the tube and the inside of the tire

To test the entire assembly leaks

Exposure to and/or storage near which of the following is considered harmful to the aircraft tires?

1. Humidity

2. Fuel

3. Oil

4. Ozone

5. Helium

6. Electrical equipment

7. Hydraulic fluid

8. Solvents

2,3,4,5,6,7,8

1,2,3,5,7,8

2,3,4,6,7,8

What action of any, should be taken when there is a difference of more than 5 pounds of air pressure in tires mounted as duals?

Replace both tires

Correct the discrepancy and entor in thoа.

To allow the tube to position itself correctly inside the tire

Excessive wear in the center of the tread of an aircraft tire is an indication of?

Incorrect camber

Excessive toe-out

Over inflation

How can it be determined that all air has been purged from a master cylinder brake system?

By operating a hydraulic unit and watching the system pressure gauge for smooth, full- scale deflection.

By noting whether the brake is firm or spongy

By noting the amount of fluid return to the master cylinder upon brake release.

After performing maintenance of ăn aircraft’s landing gear system which may have affected the system S operation, it usually necessary to

Re-inspected the area after the first flight.

Make an operational check with the aircraft on jacks

What is the purpose of compensating port or valve in a brake master cylinder of an independent brake system?

Permits the fluid flow toward or away from the reservoir as temperature changes.

Assists in the master cylinder piston return.

Prevents fluid from flowing back to the reservoir.

A filter incorporating specially treated cellulose paper is identified as a

Sediment trap

Micronic filter

A landing gear positon and warning system will provide a warning in the cockpit when throttle is

Retarded and gear is not down and locked.

Advanced and gear is down and locked.

Retarded and gear is down and locked.

The hydraulic packing seal used in a landing gear shock strut are

Generally designed to be compatible with more than one type of fluid.

Keep from direct contact with fluid Teflon or nylon back up rings

Used only with a specific type of fluid.

The best safequards aqainst heat buildup in aircraft tires are

Proper tire inflation, minimum braking, and ground rolls into the wind

Short ground rolls, sloe taxi speeds, minimum braking and proper tire inflation

Minimum braking, proper tire inflation, and long ground rolls.

The removal, installation, and repair of landing gear tires by the holder of a private pilot certificate on an aircraft owned or operated is considered to be

A violation of the Federal Aviation Regulations

Preventive maintenance

What is the function of a cam incorporated in a nose landing gear shock strut?

Provides an internal shimmy damper

Straightens the nose wheel

Provides steering of aircraft during ground operation.

Why do tire and wheel manufacturers often recommended that the tires on split rim wheels be deflated before removing the wheel from the axle?

To relive the strain on the wheel retaining nut and axle threads.

As a safety precaution in case the bolts that hold the wheel halves together have been damaged or weakened.

To remove the static load imposed upon the wheel bearing by the inflated tire.

Nose gear centering cams are used in many retractable landing gear systems. The primary purpose of the centering device is to:

Align the nosewheel prior to touchdown.

Engage the nosewheel steering.

Center the nosewheel before it enters the wheel well.

A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to:

Limit the extension of the torque arm.

Limit the extension stroke.

Reduce the rebound effect.

A pilot reports the right brake on an aircraft is spongy when the brake pedal is depressed in a normal manner. The probable cause is:

The hydraulic master cylinder piston is sticking.

Air in the brake hydraulic system

The hydraulic master cylinder piston return spring is weak.

A special bolt in a landing gear attachment requires a torque value of 440 inch-pounds. How many foot-pounds are required?

36.8

36.6

If a brake debooster is used in a hydraulic brake system, its position in the system will be:

Between the pressure manifold of the main hydraulic system and the power brake control valve.

Between the brake control valve and the brake actuating cylinder.

In the brake pressure line between the brake pedal and the brake accumulator

Which statement is true with respect to an aircraft equipped with hydraulically operated multiple-disk type brake assemblies?

There are no minimum or maximum disk clearance checks required due to the use of self. Compensating cylinder assemblies.

Do not set parking brake when brakes are hot.

No parking brake provisions are possible for this type of brake assembly

What is one effect a restricted compensator port of a master cylinder will have on a brake system?

The brakes will operate normally.

The reservoir will be filled by revers flow.

The restriction will cause slow release of the brakes.

On all aircraft equipped with retractable landing gear, some means must be provided to:

Retract and extend the landing gear if the normal operating mechanism fails.

Extend the landing gear if the normal operating mechanism fails.

Prevent the throttle from being reduced below a safe power setting while the landing gear is retracted.

Overinflated aircraft tires may cause damage to the: a.

Brake linings.

Wheel hub.

Wheel flange.

When servicing an air/oil shock strut with MIL-5606 the strut should be:

Collapsed and fluid added at the filler opening.

Fully extended and fluid added at the filler opening.

Partially extended and fluid added at the filler opening.

Aircraft tire pressure should be checked:

Using only a push on stick-type gauge having 1-pound increments.

At least once a week or more often.

As soon as possible after each flight.

A pilot reports that the brake pedals have excessive travel. A probable cause is:

Weak return springs.

Lack of fluid in the brake system.

Oil or some foreign matter on the brake rotors and linings.

What should be checked when a shock strut bottoms during a landing?

Air pressure.

Packing seals for correct installation.

Fluid level.

The primary purpose for balancing aircraft wheel assemblies is to:

Prevent heavy spots and reduce vibration.

Distribute the aircraft weight properly.

Reduce excessive wear and turbulence.

A fully-charged hydraulic accumulator provides:

Air pressure to the various hydraulic components.

A source for additional hydraulic power when heavy demands are place on the system.

Positive fluid flow to the pump inlet.

The correct inflation pressure for an aircraft tire can be obtained from:

Tire manufacturer's specifications.

The aircraft service manual.

The information stamped on the aircraft wheel.

When a properly operating fusible plug has allowed a tire to deflate, the tire should be:

Replaced.

Externally inspected for damage.

Removed from the wheel and inspected for carcass and tread damage.

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