What is the standard distance for wingtip distance when at Low Key?

The standard distance for wingtip separation when at Low Key is measured to ensure safety during the landing approach phase. The correct answer indicates using the fuel cap on the runway as a reference point for wingtip distance. This means that when an aircraft is in the Low Key position, the distance from the runway to the wingtips should be marked by the location of the fuel cap.

This specific reference helps pilots establish a standardized distance that contributes to both safety and efficiency. It provides a clear visual guide that pilots can use to judge their position in relation to the runway and other aircraft, helping to prevent situations where two aircraft might be too close to one another during the landing sequence.

In contrast, other options either lack the precision needed for safe separation or do not provide a defined reference for pilots. Therefore, using the fuel cap acts as a crucial reference point consistent across different aircraft and training scenarios.