Airframe-Landing Gear Systems

A brake debooster valve is installed in systems where the high pressure of the hydraulic system (3,000 psi) is used to operate brakes

ANSWERS

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.

that are designed to work with lower pressure.

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 reverse flow.

*The restriction will cause slow release of the brakes.

The restriction will cause slow release of the brakes.

An antiskid system is designed to

*solely sense the deceleration rate of every main landing gear wheel.

*release then reapply pressure at a slightly lower value only when a skid is detected.

*sense the deceleration rate of every main landing gear wheel and release then reapply pressure at a slightly lower value when a skid is detected.

sense the deceleration rate of every main landing gear wheel and release then reapply pressure at a slightly lower value when a skid is detected

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.

Expander-tube type.

Landing gear warning systems usually provide which of the following indications?

ANSWERS

Red light for unsafe gear; green light for gear up.

*

Green light for gear up and down; red light for unsafe gear.

*

Red light for unsafe gear; green light for gear down; no light for gear up.

Red light for unsafe gear; green light for gear down; no light for gear up.

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

ANSWERS

the piston rod and wiper are lubricated with hydraulic fluid.

*

all excess hydraulic fluid is forced out of the strut.

*

proper packing ring seating and removal of air bubbles.

proper packing ring seating and removal of air bubbles.

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

ANSWERS

The brakes will operate normally.

*

The reservoir will be filled by reverse flow.

*

The restriction will cause slow release of the brakes.

The restriction will cause slow release of the brakes.

In shock struts, chevron seals are used to

ANSWERS

absorb bottoming effect.

prevent oil from escaping.

serve as a bearing surface.

prevent oil from escaping.

The metering pins in oleo shock struts serve ANSWERS

lock the struts in the DOWN position.

*

retard the flow of oil as the struts are compressed.

*

meter the proper amount of air in the struts.

retard the flow of oil as the struts are compressed.

Debooster valves are used in brake systems primarily to

ANSWERS

ensure rapid application and release of the brakes.

*

reduce brake pressure and maintain static pressure.

*

reduce the pressure and release the brakes rapidly.

reduce the pressure and release the brakes rapidly.

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

ANSWERS

An internal leak in the master cylinder.

*

Insufficient hydraulic fluid in the reservoir.

*

Glazed brake linings.

An internal leak in the master cylinder.

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

ANSWERS

Limit compression stroke.

Hold the strut in place.

Maintain correct wheel alignment.

Maintain correct wheel alignment.

(Refer to Figure 20.) What will illuminate the amber indicator light?

Figures

ANSWERS

Closing the nosewheel gear full retract switch.

*

Retarding one throttle and closing the left wheel gear locked down switch.

*

Closing the nose, left and right wheel gear full retract switches.

Closing the nose, left and right wheel gear full retract switches.

Debooster cylinders are used in brake systems primarily to

ANSWERS

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.

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

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

ANSWERS

tire manufacturer's specifications.

*

the aircraft service manual.

*

the information stamped on the aircraft wheel.

the aircraft service manual.

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

ANSWERS

weak return springs

*

lack of fluid in the brake system.

*

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

lack of fluid in the brake system.

Debooster valves are used in brake systems primarily to

ANSWERS

ensure rapid application and release of the brakes.

*

reduce brake pressure and maintain static pressure.

*

reduce the pressure and release the brakes rapidly

reduce the pressure and release the brakes rapidly

The pressure source for power brakes is

ANSWERS

the main hydraulic system.

*

the power brake reservoir.

*

master cylinder.

the main hydraulic system.

An amber light in a gear position indicator system typically indicates what condition?

ANSWERS

At least one gear is in transition.

*

The airspeed is too high for selecting gear down.

*

All landing gear are down and locked.

At least one gear is in transition.

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

ANSWERS

3 hours.

2 hours.

1 hour.

3 hours.

How long should the aviation mechanic wait after a flight before checking tire pressure?

ANSWERS

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).

At least 2 hours (3 hours in hot weather).

A close inspection of a fusible plug reveals the core has experienced some deformation.

What is the appropriate maintenance procedure?

ANSWERS

Replace all the fusible plugs.

*

Replace the affected fusible plugs.

*

Replace with new wheel assembly.

Replace all the fusible plugs.

Where is the landing gear safety switch usually located?

ANSWERS

On the main gear shock strut.

*

On the landing gear drag brace.

*

On the pilot's control pedestal.

On the main gear shock strut.

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

ANSWERS

opposite the direction of fluid pressure.

*

up or forward when the unit is installed in a horizontal position.

*

the direction of fluid pressure.

the direction of fluid pressure.

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

ANSWERS

Permits the fluid to 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.

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

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

ANSWERS

misalignment.

underinflation.

overinflation.

overinflation

Lockout deboosters are primarily pressure reducing valves that

ANSWERS

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.

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

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

ANSWERS

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

*

the metering pin gradually reduces the size of the orifice as the shock strut extends.

*

the air is forced through a restricted orifice in the reverse direction.

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

The primary purpose for balancing aircraft wheel assemblies is to

ANSWERS

prevent heavy spots and reduce vibration.

*

distribute the aircraft weight properly.

*

reduce excessive wear and turbulence.

prevent heavy spots and reduce vibration.

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

ANSWERS

outlet of the steering damper.

*

inlet of the steering damper.

*

replenishing check valve.

inlet of the steering damper.

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

ANSWERS

the piston rod and wiper are lubricated with hydraulic fluid.

*

all excess hydraulic fluid is forced out of the strut.

*

proper packing ring seating and removal of air bubbles.

proper packing ring seating and removal of air bubbles.

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

ANSWERS

limit the extension of the torque arm.

*

limit the extension stroke.

*

reduce the rebound effect.

limit the extension stroke.

How long should the aviation mechanic wait after a flight before checking tire pressure?

ANSWERS

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).

At least 2 hours (3 hours in hot weather).

Extension of an oleo shock strut is measured to determine the

ANSWERS

amount of oil in the strut.

*

physical condition of the strut itself.

*

proper operating position of the strut

proper operating position of the strut

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?

ANSWERS

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

*

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

*

To test the entire assembly for leaks.

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

In a brake antiskid system, when an approaching skid is sensed, an electrical signal is sent to the skid control valve which

ANSWERS

acts as a bypass for the debooster cylinders.

*

relieves the hydraulic pressure on the brake.

*

equalizes the hydraulic pressure in adjacent brakes.

relieves the hydraulic pressure on the brake.

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

ANSWERS

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.

between the brake control valve and the brake actuating cylinder.

Aircraft tire pressure should be checked

ANSWERS

using only a push on stick-type gauge having one-pound increments.

*

at least once a week or more often.

*

as soon as possible after each flight.

at least once a week or more often.

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

ANSWERS

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 landin gear is retracted.

extend the landing gear if the normal operating mechanism fails.

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

ANSWERS

Worn brake lining.

*

Internal leakage in the master cylinder.

*

Deteriorated flexible hoses.

Deteriorated flexible hoses

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

ANSWERS

removing the oil filler plug and inserting a gauge.

*

measuring the length of the strut extension with a certain air pressure in the strut.

*

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

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

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

ANSWERS

use independent master cylinder systems.

*

do not use brake system accumulators.

*

use power brake control valves.

use power brake control valves.

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

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

*kept from direct contact with fluid by teflon or nylon backup rings.

*used only with a specific type of fluid.

used only with a specific type of fluid.