A Test Quiz On Basic Aircraft Landing Gear System

The distributor valve controls the inflation sequence in a pneumatic deicer boot system. It is responsible for distributing air pressure to different sections of the deicer boots in a specific sequence, ensuring that they inflate and deflate in the correct order. This helps to remove ice and frost from the aircraft's surfaces effectively, improving its performance and safety.

Breakage of control cable wires occurs most frequently where the cable passes over pulleys and through fairleads. This is because these areas experience high levels of stress and friction, which can lead to wear and tear on the cable. The constant movement and rubbing against the pulleys and fairleads can cause the cable to weaken and eventually break. Therefore, it is important to regularly inspect and maintain these areas to prevent breakage and ensure the proper functioning of the control cable system.

If the vacuum relief valve is improperly adjusted, it means that it is not set to the correct pressure level to release excess vacuum. This can cause the valve to remain closed even when there is excessive vacuum in the system. As a result, the vacuum pressure will continue to build up, leading to excessive vacuum in the vacuum system.

The correct answer suggests that if the liquid level gauge in a vapor-cycle cooling system indicates a low freon charge, the system should be operated for a period of time to reach a stable condition. This is because the system may need some time to stabilize and distribute the freon properly. After reaching a stable condition, the freon level should be rechecked to ensure that it has been adequately replenished. This approach allows for proper assessment and adjustment of the freon charge in the system.

The chattering of the hydraulic pump during operation indicates that air is entering the pump. This can be deduced because chattering is often caused by the presence of air bubbles in the hydraulic fluid. When air enters the pump, it can disrupt the smooth flow of the fluid, leading to vibrations and chattering noises. Therefore, the correct answer is that air is entering the pump.

A "tap test" is conducted to find damage in a composite inspection. This is because composite materials, which are made up of different layers of materials bonded together, can have hidden damage such as delamination or internal cracks. By tapping on the surface of the composite material, inspectors can listen for changes in sound that may indicate the presence of damage. In contrast, sheet metal inspections typically involve visual inspections or the use of non-destructive testing methods such as ultrasonic testing or dye penetrant inspection.

If an aircraft shock strut bottoms upon initial landing contact but functions correctly during taxi, the most probable cause is low fluid. This means that there is not enough hydraulic fluid in the shock strut to properly absorb the impact of landing. As a result, the strut reaches its limit and bottoms out upon initial contact. However, during taxi, the strut functions correctly because it does not experience the same level of impact as during landing.

The most likely cause for the handle of the hydraulic hand pump not being able to move in the pumping direction (pressure stroke) after installation is an incorrectly installed hand pump outport check valve. The outport check valve is responsible for allowing fluid to flow out of the pump in the desired direction, and if it is installed incorrectly, it can block the flow of fluid and prevent the handle from moving.

If the instrument static pressure line becomes disconnected inside a pressurized cabin during cruising flight, the altimeter and airspeed indicator will both read low. This is because the static pressure line is responsible for providing the necessary air pressure to these instruments for accurate readings. Without the proper static pressure, both instruments will underestimate the altitude and airspeed, resulting in lower readings.

Excessive wear on both sides of the control cable pulley groove indicates that the pulley is not properly aligned. When the pulley is misaligned, it causes the cable to rub against the sides of the groove, leading to excessive wear. This can occur due to incorrect installation or damage to the pulley itself. Cable misalignment or excessive tension may cause wear on only one side of the groove, making them incorrect explanations in this case.

A short in the up limit switch could be the probable cause for the green light to illuminate and the red light to remain lit after the completion of the landing gear extension cycle. This short circuit could be preventing the down limit switch or the gear safety switch from functioning properly, causing the red light to stay on.

When the cockpit control is moved toward the nose down position during the operation check of the elevator trim tab system, the trailing edge of the trim tab will move upward. This movement is independent of the position of the elevator.

A loud hammering noise in a hydraulic system with an accumulator usually indicates that there is too low or no preload in the accumulator. The accumulator is responsible for storing hydraulic energy and releasing it when needed. If there is insufficient preload in the accumulator, it will not be able to effectively store and release this energy, causing the hammering noise.

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