Fuentes Landing Gear Final

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

*a. 3 hours.* b. 2 hours. c. 1 hour.

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

*a. Permits the fluid to flow toward or away from the reservoir as temperature changes.* b. Assists in the master cylinder piston return. c. Prevents fluid from flowing back to the reservoir.

The pressure source for power brakes is

*a. the main hydraulic system.* b. the power brake reservoir. c. a master cylinder.

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

a. 36.8. b. 38 *c. 36.6.*

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

a. Accumulator air pressure low. *b. Inadequate supply of fluid.* c. System relief valve sticking closed.

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?

*a. To allow the tube to position itself correctly inside the tire.* b. To eliminate all the air between the tube and the inside of the tire. c. To test the entire assembly for leaks.

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

*a. When the throttle is retarded and gear is not down and locked.* b. When the throttle is advanced and gear is down and locked. c. When the throttle is retarded and gear is down and locked.

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

*a. a blue stripe or dot.* b. one or more white dots. c. a white and yellow stripe.

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

*a. collapsed and fluid added at the filler opening.* b. fully extended and fluid added at the filler opening. c. partially extended and fluid added at the filler opening.

Power boost brake systems are used on aircraft that have

*a. high landing speeds.* b. low normal hydraulic system pressure. c. more than one brake assembly per axle.*

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

*a. installed without excessive twisting.* b. for high pressure fluids with a flexing range. c. suitable for a wide temperature range.

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

*a. low fluid.* b. low air charge. c. a restricted metering pin orifice.

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

*a. slippage mark.* b. wheel-to-tire balance mark. c. wheel weight reference mark.

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

*a. that are designed to work with lower pressure.* b. that are used in conjunction with an antiskid system. c. that are used on aircraft having high landing speeds.

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

*a. toe-out.* b. toe-in. c. negative camber.

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

*a. various types of valves or orifices are used which restrict the reverse fluid flow.* b. the metering pin gradually reduces the size of the orifice as the shock strut extends. c. the air is forced through a restricted orifice in the reverse direction.

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

a. An embossed letter 'NP.' b. An embossed letter 'HP.' *c. An embossed letter 'H.'*

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

a. By operating a hydraulic unit and watching the system pressure gauge for smooth, full scale deflection. *b. By depressing the brake and noting that the brake is firm and not spongy.* c. By measuring the amount of fluid return to the master cylinder upon brake release.

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

a. Limit compression stroke. b. Hold the strut in place. *c. Maintain correct wheel alignment.*

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

a. Pressure relief valve. b. Shuttle valve. *c. Pressure regulator.*

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

a. The brakes will operate normally. b. The reservoir will be filled by reverse flow. *c. The restriction will cause slow release of the brakes.*

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

a. The brakes would become spongy. b. The brake travel would become excessive. *c. The brakes would drag.*

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

a. Worn brake lining. b. Internal leakage in the master cylinder. *c. Deteriorated flexible hoses.*

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

a. a maximum of three times. b. only by the tire manufacturer. *c. an indefinite number of times.*

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. a violation of the Federal Aviation Regulations. b. a minor repair. *c. preventive maintenance.*

In shock struts, chevron seals are used to

a. absorb bottoming effect. *b. prevent oil from escaping.* c. serve as a bearing surface.

A fully-charged hydraulic accumulator provides

a. air pressure to the various hydraulic components. *b. a source for additional hydraulic power when heavy demands are placed on the system.* c. positive fluid flow to the pump inlet.

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

a. align the nosewheel prior to touchdown. b. engage the nosewheel steering. *c. center the nosewheel before it enters the wheel well.*

Overinflated aircraft tires may cause damage to the

a. brake linings. b. wheel hub. *c. wheel flange.*

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

a. compression of the air charge. *b. the fluid being forced through a metered opening.* c. compression of the fluid.

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

a. have an engine-driven pump for greater pressure. *b. have all hydraulic power components located in one unit.* c. have a pressurized reservoir.

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

a. limit the extension of the torque arm. *b. limit the extension stroke.* c. reduce the rebound effect.

The metering pins in oleo shock struts serve to

a. lock the struts in the DOWN position. *b. retard the flow of oil as the struts are compressed.* c. meter the proper amount of air in the struts.

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

a. misalignment. b. underinflation. *c. overinflation.*

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

a. on the airplane data plate. b. in the aircraft operations limitations. *c. in the aircraft manufacturer's service manual.*

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

a. opposite the direction of fluid pressure. b. up or forward when the unit is installed in a horizontal position. *c. the direction of fluid pressure.*

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

a. outlet of the steering damper. *b. inlet of the steering damper.* c. replenishing check valve.

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

a. overinflation. b. excessive toe-in. *c. underinflation.*

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

a. prevent heavy landing gear from falling too rapidly upon extension. b. provide a means of disconnecting the normal source of hydraulic power and connecting the emergency source of power. *c. ensure operation of the landing gear and gear doors in the proper order.*

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

a. reduce pressure for brake application. b. prevent the tire from skidding. *c. compensate for thermal expansion.*

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

a. removing the oil filler plug and inserting a gauge. b. measuring the length of the strut extension with a certain air pressure in the strut. *c. releasing the air and seeing that the oil is to the level of the filler plug.*

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

a. retract and extend the landing gear if the normal operating mechanism fails. *b. extend the landing gear if the normal operating mechanism fails.* c. prevent the throttle from being reduced below a safe power setting while the landing gear is retracted.

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

a. shunt field series-wound motor. b. split field shunt-wound motor. *c. split field series-wound motor.*

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

a. the hydraulic master cylinder piston is sticking. *b. air in the brake hydraulic system.* c. the hydraulic master cylinder piston return spring is weak.

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

a. the master cylinder one-way cup is leaking. *b. worn brake linings.* c. worn brake disk causing excessive clearance between the notches on the perimeter of the disk and the splines or keys on the wheel.

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

a. the piston rod and wiper are lubricated with hydraulic fluid. b. all excess hydraulic fluid is forced out of the strut. *c. proper packing ring seating and removal of air bubbles.*

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

a. tire manufacturer's specifications. *b. the aircraft service manual.* c. the information stamped on the aircraft wheel.

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

a. use independent master cylinder systems. b. do not use brake system accumulators. *c. use power brake control valves.*

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

a. weak return springs *b. lack of fluid in the brake system.* c. oil or some foreign matter on the brake rotors and linings.

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

a. withdrawing air only from the system. *b. withdrawing fluid from the system for the purpose of removing air that has entered the system.* c. replacing small amounts of fluid in reservoir.