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Questions and Answers
Excessive wear in the shoulder area of an aircraft tire is an indication of what?
How long should you wait after a flight before checking tire pressure?
What causes parking brakes to continually bleed off pressure aside from an external leak?
An internal leak in the master cylinder
What is the purpose of an orifice check valve?
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What is the probable cause if the left brake is dragging excessively on an airplane on which no recent brake service has been performed?
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What type of valve is generally used in the brake actuating line?
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What is the function of chines on some aircraft nose wheel tires?
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What device in a hydraulic system with a constant-delivery pump allows circulation of the fluid when no demands are on the system?
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What device allows full debooster piston travel without fluid from the high pressure side entering the low pressure chamber?
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Study Notes
Aircraft Landing Gear System
- Excessive shoulder wear on aircraft tires indicates overinflation, excessive toe-in, or underinflation.
- Check tire pressure at least 2-4 hours after flight, depending on weather conditions (3 hours in hot weather, up to 5 hours).
- Parking brakes may bleed off primarily due to an internal leak in the master cylinder, insufficient hydraulic fluid, or glazed brake linings.
- The orifice check valve serves to restrict flow in one direction while allowing free flow in the opposite direction.
Brake System Components
- Aircraft brakes that require a large volume of fluid use power brake control valves instead of accumulators.
- Lockout deboosters are designed to allow full piston travel without allowing fluid to pass from the high-pressure side to the low-pressure chamber.
- A broken piston return spring in a brake master cylinder can cause sponginess and potentially lead to dragging brakes.
Shock Struts and Seals
- Chevron seals in shock struts are utilized to prevent oil leakage and may help in absorbing bottoming effects.
Brake System Issues
- Excessive dragging of the left brake may stem from foreign particles in the master cylinder compensating port, excessively worn brake linings, or low fluid supply.
- A stripe or mark on a wheel rim that extends onto the tire sidewall indicates a slippage mark or wheel-to-tire balance mark.
Tire and Brake Performance Features
- Chines on aircraft nose wheel tires help with nose gear extension at high speeds and reduce hydroplaning risks by directing water away from the fuselage.
Hydraulic Systems
- Electric motors for operating landing gear are likely to be split field series-wound motors for effective gear management.
- A pressure relief valve in hydraulic systems allows circulation of fluid when system demands are low.
- A 'power pack' hydraulic system features an engine-driven pump and consolidates hydraulic power components within a single circuit, along with a pressurized reservoir.
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Description
Test your knowledge on aircraft maintenance with this comprehensive quiz. Covering topics such as landing gear systems and brake assembly relief valves, this quiz is ideal for aviation students and professionals. Challenge yourself and ensure you understand crucial maintenance concepts.
