Private Pilot Private Exam

How will frost on the wings of an airplane affect takeoff performance?

1. Frost will enhance aerodynamic lift.

2. Frost will have no effect on takeoff performance.

3. Frost will increase drag and reduce lift capability.

4. Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.

The correct answer is: Frost will disrupt the smooth flow of air over the wing, adversely affecting its lifting capability.

Frost on the wings of an airplane disrupts the smooth flow of air over the wing, which is crucial for maintaining effective lift. When the wing surfaces are covered in frost, the aerodynamic characteristics are altered. Smooth airflow is essential for creating the pressure differential required for lift. Frost creates surface roughness that triggers turbulent airflow, causing the air to separate from the wing earlier than it normally would. This premature airflow separation leads to a significant reduction in lift capability at critical phases of flight, particularly during takeoff. The presence of frost not only diminishes lift but could also increase drag, as the air has to work harder to overcome the surface irregularities introduced by the frost. This combination of reduced lift and increased drag can severely impact the aircraft's takeoff performance, leading to potential safety issues if proper precautions are not taken to ensure the wings are clear of frost and ice prior to departure.