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

What is inhibited below the minimum maneuvering speed (Vmin) during stall protection operation?

1. No trim nose up

2. Flaps extension

3. Engine throttle

4. Airspeed indicator

The correct answer is: No trim nose up

In the context of stall protection systems, while operating below the minimum maneuvering speed (Vmin), certain aircraft functions are intentionally limited to enhance safety and prevent the exacerbation of a stall situation. Inhibiting nose-up trim during this phase is significant because trim adjustments can influence the aircraft's pitch attitude and control characteristics. When the trim is set to nose up while below Vmin, it could lead to an excessive nose-up attitude, increasing the risk of stalling since the airflow over the wings may already be insufficient to maintain lift. By inhibiting nose-up trim, the system ensures that pilots maintain better control of the aircraft's pitch during critical low-speed phases. This safety measure contributes to reducing the likelihood of entering an uncontrollable stall. The other options represent functionalities that may not have the same direct impact on stall dynamics at low speeds, or they are operational under different flight parameters. Therefore, the focus on inhibiting nose-up trim is crucial for maintaining safe handling characteristics in scenarios where aerodynamic performance is limited.