General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

What occurs if the EEC detects a sub-idle stall recovery?

1. Fuel is completely cut off

2. Fuel is shut off for 1 second to clear the stall

3. Throttle is adjusted to maximum

4. Stall warning is triggered

The correct answer is: Fuel is shut off for 1 second to clear the stall

When the EEC (Electronic Engine Control) detects a sub-idle stall recovery, the system temporarily shuts off the fuel for a brief period, typically around one second. This action serves to clear the conditions causing the stall. By cutting fuel, the EEC helps ensure that the engine can regain normal operation and airflow, preventing a more serious stall condition that could affect engine performance and safety. This mechanism is designed to react quickly to protect the engine and maintain control, aligning with safety protocols in aviation. Upon reestablishment of airflow, the fuel flow is resumed, allowing for normal engine function after the stall is cleared. Other choices provide responses that do not align with engine management principles in stall recovery scenarios. For instance, completely cutting off fuel or adjusting throttle to maximum could lead to more significant engine recovery issues or even engine failure, rather than remedying the stall condition. Similarly, simply triggering a stall warning without an effective recovery strategy would not effectively address the issue at hand. Therefore, the fuel shut-off for a short duration as a recovery measure is the appropriate response in this context.