During a pre-flight walk-around, what should you do if you notice frost on the engine nacelle?

The best course of action when observing frost on the engine nacelle during a pre-flight walk-around is to enter the plane to view the top of the wings. This is important because frost can affect the aerodynamic performance of the wings, which is critical for flight. By checking the wings, you can assess the overall condition of the aircraft and determine if there are any issues that need to be addressed before takeoff.

In general, if frost is present anywhere on the aircraft, especially on the wings and control surfaces, it is crucial to get a complete picture of the situation to ensure safety. Visibility from inside the plane allows for a better inspection of the wings and for decision-making regarding de-icing procedures or whether to proceed with the flight.

Other options may suggest actions that could be less effective or unsafe. For instance, removing frost might not be appropriate unless specific guidelines are followed to ensure that no damage occurs. Canceling the flight could be unnecessary if the situation can be assessed safely during the inspection, and waiting for the sun to melt frost is generally not reliable as conditions may not change quickly enough to ensure safe operation.