What might happen if de-icing is not performed effectively?

If de-icing is not performed effectively, the aircraft is likely to experience reduced lift and control, which can lead to unsafe flight conditions. Ice accumulation on critical surfaces such as the wings, tail, and control surfaces disrupts the airflow, creating a decrease in aerodynamic efficiency. This can result in a loss of lift, making it difficult for the aircraft to take off or maintain stable flight.

Additionally, poor de-icing can compromise the pilot's ability to control the aircraft, potentially leading to dangerous situations, especially during critical phases of flight such as takeoff and landing. Ensuring that de-icing is conducted properly reduces these risks and enhances flight safety, which is why this choice rightly identifies the serious consequences of ineffective de-icing practices.