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Aircraft Landing sy
Aircraft landing gear systems
| Question | Answer |
|---|---|
| Exposure to and/or storage near which of the following is considered harmful to aircraft tires? | 2, 3, 4, 6, 7, 8. |
| What would be the effect if the piston return spring broke in a brake master cylinder? | The brakes would drag |
| In brake service work, the term 'bleeding brakes' is the process of | *b. withdrawing fluid from the system for the purpose of removing air that has entered the system. |
| 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. |
| 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. |
| 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. |
| The metering pins in oleo shock struts serve to | retard the flow of oil as the struts are compressed. |
| 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. |
| 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. |
| 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. |
| If it is determined that spongy brake action is not caused by air in the brake system, what is the next most likely cause? ~ | c. Deteriorated flexible hoses. |
| Many brake types can be adapted to operate mechanically or hydraulically. Which type is not adaptable to mechanical operation? ~ | *c. Expander-tube type. |
| 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. |
| A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a ~ | a. slippage mark. |
| When bleeding aircraft brakes, one of the indications that the air has been purged from the system is ~ | c. firm brake pedals. |
| Overinflated aircraft tires may cause damage to the | wheel flange. |
| Debooster valves are used in brake systems primarily to ~ | reduce the pressure and release the brakes rapidly. |
| 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. |
| On an air valve core stem, what indicates high-pressure type? ~ | *c. An embossed letter 'H |
| The primary purpose for balancing aircraft wheel assemblies is to ~ | a. prevent heavy spots and reduce vibration. |
| Power boost brake systems are used on aircraft that have | high landing speeds. |
| On all aircraft equipped with retractable landing gear, some means must be provided to | b. extend the landing gear if the normal operating mechanism fails. |
| An automatic damping action occurs at the steering damper if for any reason the flow of high-pressure fluid is removed from the ~ | b. inlet of the steering damper. |
| What is the purpose of the torque links attached to the cylinder and piston of a landing gear oleo strut? ~ | c. Maintain correct wheel alignment. |
| 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 ~ | c. preventive maintenance. |
| Aircraft brakes requiring a large volume of fluid to operate the brakes generally | c. use power brake control valves. |
| 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. |
| When an air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by | b. the fluid being forced through a metered opening. |
| Internal leakage in a brake master cylinder unit can cause ~ | c. the pedal to slowly creep down while pedal pressure is applied. |
| A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to | limit the extension stroke. |
| 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. |
| The pressure source for power brakes is | the main hydraulic system. |
| 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. |
| 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. |
| When servicing an air/oil shock strut with MIL-5606 the strut should be | collapsed and fluid added at the filler opening. |
| 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. |
| The purpose of a relief valve in a brake system is to | compensate for thermal expansion. |
| Aircraft tire pressure should be checked | at least once a week or more often. |
| 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 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. |
| 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 function of a cam incorporated in a nose gear shock strut? ~ | Straightens the nosewheel. |
| Extension of an oleo shock strut is measured to determine the | proper operating position of the strut. |
| Debooster cylinders are used in brake systems primarily to | reduce the pressure to the brake and increase the volume of fluid flow. |
| If a shock strut bottoms after it has been properly serviced, the | strut should be removed, disassembled, and inspected. |
| A high-speed aircraft tire with a sound cord body and bead may be recapped ~ | an indefinite number of times. |
| 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. |
| The correct inflation pressure for an aircraft tire can be obtained from ~ | the aircraft service manual. |
| What should be checked when a shock strut bottoms during a landing? ~ | Fluid level. |
| How can it be determined that all air has been purged from a master cylinder brake system? ~ | By noting whether the brake is firm or spongy. |
| 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. |
| 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. |
| The hydraulic packing seals used in a landing gear shock strut are ~ | used only with a specific type of fluid. |
| 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. |
| When a properly operating fusible plug has allowed a tire to deflate, the tire should be ~ | replaced. |
| Chines are used on some aircraft nose wheel tires to help ~ | deflect water away from the fuselage. |
| The best safeguards against heat buildup in aircraft tires are ~ | short ground rolls, slow taxi speeds, minimum braking, and proper tire inflation. |
| The fusible plugs installed in some aircraft wheels will | melt at a specified elevated temperature. |
| 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. |
| how long should you wait after a flight before checking tire pressure? ~ | At least 2 hours (3 hours in hot weather). |
| Excessive wear in the shoulder area of an aircraft tire is an indication of ~ | underinflation. |
| Excessive wear in the center of the tread of an aircraft tire is an indication of ~ | overinflation. |
| 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. |
| In shock struts, chevron seals are used to ~ | . prevent oil from escaping. |
| 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. |
| A pilot reports that the brake pedals have excessive travel. A probable cause is | lack of fluid in the brake system. |
| 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. |
| 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. |
| 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. |
| 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. |
| A fully-charged hydraulic accumulator provides ~ | a source for additional hydraulic power when heavy demands are placed on the system. |
| A hydraulic system referred to as a 'power pack' system will ~ | have all hydraulic power components located in one unit. |
| A hydraulic hose identified as MIL-H-8794 will have a yellow stripe running the length of the hose. This stripe ~ | is used to ensure that the hose is installed without excessive twisting. |
| 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 condition would most likely cause excessive fluctuation of the pressure gauge when the hydraulic pump is operating? | Inadequate supply of fluid. |
| A filter incorporating specially treated cellulose paper is identified as a ~ | micronic filter. |
| The purpose of an orifice check valve is to | . restrict flow in one direction and allow free flow in the other. |
| To reach the nut, a 2-inch straight adapter must be used on an 18-inch torque wrench. How many foot-pounds will be indicated on the torque wrench when the required torque of the nut is reached? | 24 |
| A special bolt in a landing gear attachment requires a torque value of 440 inch-pounds. How many foot-pounds are required? | 36.6. |
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Eldad