11 A stall occurs when the smooth airflow over the unmanned airplane`s wing is disrupted, and the lift degenerates rapidly. This is caused when the wing
B. exceeds maximum allowable operating weight.
Adding weight to the aircraft increases the Load Factor.  This means the wing must produce suficient additional lift to counterbalance the additional weight. The necessary additional lift is acquired by applying back pressure to the elevator control. This increases the wing’s AOA (Angle of Attack), and results in increased lift. If at any time the AOA becomes excessive, the aircraft stalls.
This is not the correct answer.
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