What is the recommended action when a compressor stall occurs and a recoverable surge is detected?

• A. Increase throttle to maximize thrust.
• B. Lower AOA, Increase Airspeed, Reduce Thrust.
• C. Hold the pitch and maintain current airspeed.
• D. Continue with the normal checklist.

Answer: (B)

When a compressor stall is recoverable, the goal is to restore stable airflow through the engine by reducing the engine’s demand and improving the airflow through the compressor. A stall happens when the compressor can’t handle the current flow and pressure demands, often due to a high angle of attack or low airspeed. Lowering the angle of attack eases the load on the compressor, helping the flow reattach. Increasing airspeed moves the operating point toward the stable region of the compressor map and provides more ram air to the engine. Reducing thrust lowers the mass flow and energy input, which reduces the likelihood of further surge and helps the compressor settle back into stable operation. Increasing throttle would worsen the surge by pushing more air through the engine, and holding pitch or sticking to a normal checklist without addressing the stall delays the recovery.