Aircraft Landing Gear Systems

A fully-charged hydraulic accumulator provides...

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

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...

Air in the brake hydraulic system.

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.

Chines are used on some aircraft nose wheel tires to help...

Deflect water away from the fuselage.

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

Expander-tube type

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

Inadequate supply of fluid.

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

Lack of fluid in the brake system.

The fusible plugs installed in some aircraft wheels will...

Melt at a specified elevated temperature.

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

Overinflation

In shock struts, chevron seals are used to...

Prevent oil from escaping.

The purpose of an orifice check valve is to...

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

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

Slippage mark.

What action should be taken whenever maintenance is performed that will affect the landing gear system performance?

The aircraft should be placed on jacks and a retraction test should be performed.

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

The restriction will cause slow release of the brakes.

In brake service work, the term "bleeding brakes" is the process of...

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

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

toe-out

What is the minimum amount of time to wait for tires to cool before checking tire pressure?

3 hours.

The braking action of a Cleveland disk brake is accomplished by compressing a rotating disk between two opposite brake linings. How is equal pressure on both sides of the rotating disk assured?

By allowing the caliper to float to automatically equalize as pressure is applied to the rotor.

How is it determined in a master cylinder brake system that all of the air has been purged from the system?

By depressing that brake and noting that the brake is firm and not spongy.

If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause?

Deteriorated flexible hoses.

The purpose of a sequence valve in a hydraulic retractable landing gear system is to...

Ensure the operation of the landing gear and gear doors in the proper order.

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

Maintain correct wheel alignment.

A filter incorporating specially treated cellulose paper is identified as...

Micronic filter

The primary purpose for balancing aircraft wheel assemblies is to...

Prevent heavy spots and reduce vibration.

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

Proper operating position if the strut.

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

Underinflation

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

Use power brake control valves

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

Worn brake linings.

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

Do not set parking brake when brakes are hot

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

In the aircraft manufacturer's service manual.

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

Inlet of the steering damper.

The hydraulic packing seals used in a landing gear shock strut are...

Used only with a specific type of fluid.

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

36.6

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

2 fuel, 3 oil, 4 ozone, 6 electrical equipment, 7 hydraulic fluid, 8 solvents.

An o-ring intended for use in a hydraulic system using MIL-H-5606 (mineral base) fluid will be marked with...

A blue stripe or dot.

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 shuttle valve

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.

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

An embossed letter 'H'.

A high-speed aircraft tire with a sound cord body and bead may be recapped...

An indefinite number of times.

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

At least 2 hours (3 hours in hot weather)

Aircraft tire pressure should be checked...

At least once a week, or more often

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

Between the brake control valve and the brake actuating cylinder.

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

Center the nosewheel before it enters the wheel well..

When servicing and air/oil shock strut with MIL-5606 the strut should be...

Collapsed and fluid added at the filler opening.

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

Compensate for thermal expansion

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

Correct the discrepancy and enter in the aircraft records.

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

Extend the landing gear if the normal operating mechanism fails.

When bleeding aircraft brakes, one of the indications that the air has been purged from the system is...

Firm brake pedals.

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

Have all hydraulic power components located in one unit.

Power boost brake systems are used on aircraft that have...

High landing speeds.

The repair for 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...

Inserting, removing, or changing the locations of washers or spacers at the center pivotal point of the scissor torque links.

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

Installed without excessive twisting.

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

Limit the extension stroke.

If an aircraft shock strut (air/oil type) bottoms up upon initial landing contact, but functions correctly during taxi, the most probable cause is...

Low fluid.

If shock strut bottoms out after it has been properly serviced, the...

Strut should be removed, disassembled, and inspected.

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3000 psi) is used to operate brakes...

That are designed to work with lower pressure.

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

The aircraft service manual.

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

The brakes would drag.

When an air/oil type landing gear shock strut is used, the initial shock of landing is cushioned by...

The fluid being forced through a metered opening.

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

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

When working with high pressure, high performance tires, why is it recommended to deflate the tires when removing wheels from the axle?

To ensure safety in case of a defective wheel or broken tie bolts.

To prevent a very rapid extension of an oleo shock strut after initial compression resulting from landing impact...

Various types of valves or orifices are used which restrict the reverse fluid flow.

When will a continuous horn provide a warning in the cockpit?

When the throttle is retarded and gear is NOT down and locked.

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

Fluid level

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.

The pressure source for power brakes is...

Main hydraulic system.

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

Pressure regulator

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...

Preventative maintenance.

When servicing an empty shock strut with fluid, the strut should be completely compressed and extended several times to ensure...

Proper packing ring seating and removal of air bubbles

Debooster valves are used in brake systems primarily to...

Reduce the pressure and releases the brakes rapidly.

Debooster cylinders are used in brake systems primarily to...

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

On most aircraft, the oil level of an air and oil shock strut is check by...

Releasing the air and seeing that the oil is to the level of the filler plug.

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

Split field series-wound motor

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

The direction of fluid pressure.

Internal leakage in a brake master cylinder unit can cause...

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

Overinflated aircraft tires may cause damage to the...

Wheel flange

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

Straightens the nosewheel.

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

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

A close inspection of a fusible plug reveals the core has experienced some deformation. What is the appropriate maintenance procedure?

Replace all of the fusible plugs.

The metering pins in oleo chock struts serve to...

Retard the flow of oil as the struts are compressed.

The best safeguards against heat buildup in aircraft tires are...

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