What is the recommended action if frost is observed on aircraft surfaces before flight?

Cleaning frost off aircraft surfaces before flight is crucial because frost can significantly affect the aircraft's aerodynamics and performance. Frost adds weight and alters the shape of the wings and control surfaces, which can lead to reduced lift and control difficulties during takeoff and climb.

By removing the frost, you ensure that the aircraft maintains its designed aerodynamic characteristics, allowing for safe operation during flight. Assessing operational safety without addressing the frost can lead to dangerous situations, as the altered flight dynamics may not provide adequate lift at critical phases of flight, particularly during takeoff.

Waiting for external conditions to improve might overlook the immediate need to prepare the aircraft thoroughly, and consulting with additional crew members about visibility does not directly address the immediate safety concerns associated with frost accumulation. Thus, proper cleaning and preparation of the aircraft surfaces are essential for safe operations in such conditions.