What action should be taken during a compressor stall?

• A. Increase collective
• B. Lower collective to clear the stall
• C. Increase airspeed to 70 KIAS
• D. Maintain current altitude

Answer: (B)

During a compressor stall, the appropriate action is to lower collective to clear the stall. This response is crucial because compressor stalls result from an imbalance of airflow, which affects the engine's ability to maintain consistent performance. By lowering the collective, you reduce the engine's power demand, which helps restore airflow to the compressor, allowing it to recover from the stall.

It is important to act quickly and decisively during a compressor stall to prevent further complications or potential engine damage. Lowering the collective changes the rotor disk loading, helping to alleviate the conditions that caused the stall in the first place.

In this situation, increasing collective would exacerbate the problem, as it would further increase the power demand on the engine, potentially worsening the stall situation. Increasing airspeed to 70 KIAS might be helpful in some contexts to improve airflow and reduce drag, but it does not directly address the immediate need to rectify a stall condition. Maintaining current altitude while in a stall situation is not advisable, as it does not facilitate the necessary recovery actions to bring the engine back to normal operation. The focus should be on clearing the stall effectively and safely.