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

Question: 1 / 550

During which flight phases should cowl flaps typically remain open?

Cruising and landing

Taxiing and takeoff

Cowl flaps are designed to regulate engine cooling by controlling the airflow over the engine. During taxiing and takeoff, it is essential to keep the cowl flaps open to ensure adequate cooling since the engine is operating at lower RPMs and may not receive sufficient airflow. During these phases, increased airflow helps in maintaining optimal engine temperatures.

In contrast, during cruising, descent, and landing, engines generally experience higher RPMs or are under different aerodynamic pressures, which can provide adequate cooling without the need for the cowl flaps to be fully open. High-speed straight and level flight also provides sufficient airflow for cooling, making it unnecessary to keep the cowl flaps open.

Understanding the proper operation of cowl flaps during each flight phase is critical for engine management and performance optimization.

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Descent and approach

High-speed straight and level flight

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