Questions and Answers
Why do most aircraft tire manufacturers recommend that the tubes in newly installed tire must be first inflated, fully deflated, and then re-inflated to the correct pressure?
Exposure to and/or storage near which of the following is considered harmful to aircraft tires?
What action should be taken when there is a difference of more than 5 pounds of air pressure in tires mounted as duals?
Excessive wear in the center of the tread of an aircraft tire is an indication of:
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How can it be determined that all air has been purged from a master cylinder brake system?
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After performing maintenance on an aircraft’s landing gear system, which may have affected the system’s operation, it is usually necessary to:
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What is the purpose of compensating port or valve in a brake master cylinder of an independent brake system?
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A filter incorporating specially treated cellulose paper is identified as a:
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A landing gear position and warning system will provide a warning in the cockpit when the throttle is:
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The hydraulic packing seal used in a landing gear shock strut are:
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Where is information found concerning acceptable species substitutions for wood materials used in aircraft repair?
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Which of the following conditions will determine acceptance of wood with mineral streaks?
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Study Notes
Wood Aircraft Structures
- Compression failures in wood aircraft structures are characterized by buckling of the fibers that appear as streaks on the surface, at right angles to the grain.
- Decay that appears to be mineral streaks is not acceptable.
- Any form or amount of decay is not permitted.
- Wood with mineral streaks is not acceptable for aircraft repair.
- Pin knot clusters are permitted in wood aircraft structure provided no pitch pockets are within 12 inches.
Laminated Wood
- Laminated wood is sometimes used in the construction of highly stressed aircraft components.
- Laminated wood spars may be substituted for solid rectangular wood spars under certain conditions.
- Laminated wood can be identified by its perpendicular grain construction.
Aircraft Landing Gear System
- Excessive wear in the shoulder area of an aircraft tire is an indication of underinflation.
- Tire pressure should be checked at least 2 hours (3 hours in hot weather) after a flight.
- The purpose of an orifice check valve is to restrict flow in one direction and allow free flow in the other.
- Lockout deboosters are primarily pressure reducing valves.
- The metering pin in oleo shock struts serves to meter the proper amount of air in struts.
- In shock struts, chevron seals are used to prevent oil from escaping.
- The left brake is dragging excessively, the most probable cause is foreign particles stuck in the master cylinder compensating port.
- A stripe or mark applied to a wheel rim and extending onto the sidewall of a tube-type tire is a wheel-to-tire balance mark.
- Chines are used on some aircraft nose wheel tires to help reduce the possibility of hydroplaning.
Hydraulic Systems
- The purpose of a relief system valve in a brake assembly system is to compensate for thermal expansion.
- A debooster valve is used in brake systems to reduce brake pressure and maintain static pressure.
- Bleeding brakes is the process of withdrawing air only from the system.
- Debooster cylinders are used in brake systems to reduce the pressure to the brake and increase the volume of fluid flow.
- A hydraulic system referred to as a ‘power pack’ system will have an engine-driven pump for greater pressure.
- The repair of an out-of-tolerance toe-in condition of main landing gear wheels consists of inserting, removing, or changing the location of washers or spacers at the center pivotal point of the scissors torque links.
Brake Systems
- Internal leakage in a brake master cylinder unit can cause the pedal to slowly creep down while pedal pressure is applied.
- Automatic damping action at the steering damper is necessary to ensure that the flow of high-pressure fluid is removed from the outlet of the steering damper.
- The O-ring intended for use in a hydraulic system using MIL-H5606 (mineral base) fluid will be marked with a blue striper or dot.
- Exposure to and/or storage near fuel, oil, ozone, and hydraulic fluid is considered harmful to the aircraft tires.
Tire and Wheel Maintenance
- The best safeguards against heat buildup in aircraft tires are proper tire inflation, minimum braking, and ground rolls into the wind.
- Tire and wheel manufacturers often recommend that the tires on split rim wheels be deflated before removing the wheel from the axle to relieve the strain on the wheel retaining nut and axle threads.
- Aircraft tire pressure should be checked at least once a week or more often, using a push-on stick-type gauge having 1-pound increments.
Landing Gear and Shock Struts
- A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to limit the extension stroke.
- The primary purpose of a cam incorporated in a nose landing gear shock strut is to provide an internal shimmy damper.
- A special bolt in a landing gear attachment requires a specific torque value.
- Overinflated aircraft tires may cause damage to the wheel hub.
- Aircraft equipped with retractable landing gear must have some means provided to extend the landing gear if the normal operating mechanism fails.
Brake and Hydraulic System Troubleshooting
- 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.
- If a brake debooster is used in a hydraulic brake system, its position in the system will be between the pressure manifold of the main hydraulic system and the power brake control valve.
- A restricted compensator port of a master cylinder will have the effect of slow release of the brakes.
- If a shock strut bottoms during a landing, the air pressure, packing seals, and fluid level should be checked.### Checking Oil Level in Air and Oil Shock Strut
- Oil level is checked by removing the oil filler plug and inserting a gauge, or by measuring the length of the strut extension with a certain air pressure in the strut, or by releasing the air and seeing that the oil level is at the filler plug.
Cleveland Disk Brake
- Braking action is accomplished by compressing a rotating brake disk between two opposite brake linings.
- Equal pressure on both sides of the rotating disk is assured by allowing the caliper to float to automatically equalize as pressure is applied to the rotor.
Shock Strut Maintenance
- If a shock strut bottoms after being properly serviced, it should be removed, disassembled, and inspected.
- Air pressure should not be increased as a solution.
Power Boost Brake Systems
- Power boost brake systems are used on aircraft with high landing speeds, low normal hydraulic system pressure, or more than one brake assembly per axle.
- The pressure source for power brakes is the main hydraulic system.
Aircraft Tire Maintenance
- A high-speed aircraft tire with a sound cord body and bead may be recapped an indefinite number of times.
- Tire recapping is not limited to the manufacturer or a maximum of three times.
Air/Oil Type Landing Gear Shock Strut
- Initial shock of landing is cushioned by the fluid being forced through a metered opening.
- Compression of the air charge or compression of the fluid does not cushion the initial shock.
Oleo Shock Strut
- To prevent rapid extension after initial compression resulting from landing impact, various types of valves or orifices are used which restrict the reverse fluid flow.
- Metering pin or air forced through a restricted orifice does not prevent rapid extension.
Sequence Valve in Hydraulic Retractable Landing Gear System
- The purpose of a sequence valve is to ensure the operation of the landing gear and gear doors in the proper order.
- It does not prevent heavy landing gear from falling too rapidly upon extension or provide a means of disconnecting the normal source of hydraulic power.
Bleeding Aircraft Brakes
- One indication that air has been purged from the system is firm brake pedals.
- Partial or full brake pedal travel does not indicate air has been purged.
Fusible Plugs in Aircraft Wheels
- Fusible plugs melt at a specified elevated temperature.
- They do not indicate tire tread separation or prevent over inflation.
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Description
This quiz covers the rules and guidelines for wood aircraft structures, including compression failures, decay, and knot clusters. Learn about the acceptable and unacceptable conditions for wood used in aircraft repair.
