What should you do if you suspect a compressor stall?

• A. PCL - Increase power immediately
• B. PCL - Slowly advance as required
• C. PCL - Retard below stall threshold
• D. Attempt to stabilize the flight

Answer: (C)

If you suspect a compressor stall, retarding the power control lever (PCL) below the stall threshold is the appropriate response because it helps to reduce the engine's power output and alleviate the conditions that may lead to or exacerbate a stall. Compressor stalls often occur due to airflow disruptions in the engine's compressor, which can be influenced by high power settings, rapid throttle movements, or extreme maneuvers.

By reducing the power, the airflow through the engine can stabilize, which may allow the compressor to recover and avoid further complications. Maintaining awareness of the stall threshold is crucial, as operating above this threshold increases the risk of engine damage and can lead to a more severe stall condition.

In contrast, rapidly increasing power or retarding the power too much may not effectively address the issue and could lead to loss of control. Thus, carefully managing the engine's power output is essential in resolving the situation and maintaining safe flight operations.