Airframe O&P landing gear

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.

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

An embossed letter 'H.'

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.

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

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

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.

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.

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.

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

The brakes would drag.

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

The restriction will cause slow release of the brakes.

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

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

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

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.

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.

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

at least 2 hours, 3 if 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.

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

ensure proper packing ring seating and removal of air bubbles.

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 location of washers or spacers at the center pivotal point of the scissor torque links.

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

lack of fluid in the brake system.

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 upon initial landing contact, but functions correctly during taxi, the most probable cause is

low fluid

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

maintain correct wheel alignment

After performing maintenance on an aircraft's landing gear system which may have affected the system's operation, it is usually necessary to

make an operational check with the aircraft on jacks.

The fusible plugs installed in some aircraft wheels will

melt at a specified elevated temp.

A filter incorporating specially treated cellulose paper is identified as a

micronic filter

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

In shock struts, chevron seals are used to

prevent oil from escaping

The primary purpose for balancing aircraft wheel assemblies is to

prevents heavy spots and reduce vibration

Extension of an oleo shock strut is measured to determine the

proper operating position of the strut.

Debooster valves are used in brake systems primarily to

reduce the pressure and release 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 checked by

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

The metering pins in oleo shock struts serve to

retard the flow of oil as the struts are compressed.

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

retarded and gear is not down and locked.

When hydraulically operated multiple-disk type brake assemblies are hot, what should you not do?

set the parking brake

The best safeguards against heat buildup in aircraft tires are

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

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

slippage mark

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

split field series-wound motor.

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

strut should be removed, disassembled, and inspected.

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

the aircraft service manual.

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

the direction of fluid pressure.

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

the fluid being forced through a metered opening

The pressure source for power brakes is

the main hydraulic system

Internal leakage in a brake master cylinder unit can cause

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

The braking action of a Cleveland disk brake is accomplished by compressing a rotating brake 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.

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

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

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

Straightens the nosewheel

When servicing an 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

Chines are used on some aircraft nose wheel tires to help

deflect water away from the fuselage.

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

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

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

firm brake pedals

What should be checked when a shock strut bottoms during a 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.

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

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.

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

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

use power brake control valves.

Overinflated aircraft tires may cause damage to the

wheel flange

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

worn brake linings