As part of the post de-icing inspection, what must be verified as free of frozen contaminants?

The requirement to verify that all critical surfaces, engine inlets, and pitot/static ports are free of frozen contaminants is crucial for ensuring the safe operation of an aircraft. Critical surfaces include the wings, tail, and control surfaces, which play an essential role in maintaining aerodynamic performance. If these surfaces are not clear of ice or snow, they can significantly affect airflow, leading to reduced lift and increased drag, potentially causing a loss of control.

Engine inlets must also be inspected because ice accumulation can obstruct airflow into the engine, leading to performance issues or, in severe cases, engine failure. Similarly, pitot/static ports need to be clean and unobstructed to ensure accurate readings of airspeed and altitude, both of which are vital for safe flight operations.

In contrast, while the other options might refer to important components of the aircraft, they do not encompass the comprehensive safety checks required after de-icing. Ensuring these critical aspects are clear of contaminants is a key step in the post-de-icing inspection process to promote safety and operational integrity.