Commercial Pilot License (CPL) 2025 – 400 Free Practice Questions to Pass the Exam

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What do fuel strainer drains help to maintain in an aircraft?

Engine temperature control

Fuel cleanliness

Fuel strainer drains are crucial components in an aircraft's fuel system, designed primarily to ensure the cleanliness of the fuel being supplied to the engine. Over time, contaminants such as water, sediment, or other foreign materials can accumulate in the fuel. These impurities not only pose a risk to engine performance but can also lead to engine failure if not addressed.

By regularly draining the fuel strainers, pilots and maintenance personnel can remove these contaminants, thereby maintaining the overall quality of the fuel. This proactive measure helps ensure that only clean fuel reaches the engine, which is vital for optimal engine performance and reliability.

In this context, maintaining fuel cleanliness directly correlates with the efficient operation of the aircraft, supporting safe and effective flight operations.

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Air pressure in tanks

Oil viscosity

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