How far away must lightning be for you to cease flight-line operations and seek shelter?

How far away must lightning be for you to cease flight-line operations and seek shelter?

• A. Three miles
• B. Five miles
• C. Ten miles
• D. One mile

Answer: (B)

Lightning safety on the flight line is about keeping a protective distance from a lightning threat. The standard guideline is to stop flight-line operations and seek shelter when lightning is within five miles. This five-mile buffer gives a practical margin because lightning can strike outside the visible area of a storm, and conditions can worsen quickly, leaving little time to react if you stay exposed. In practice, you’ll often use the flash-to-bang cue: if you hear thunder soon after a lightning flash, the storm is nearby—roughly within a few miles—and you should seek shelter. Five miles represents a conservative balance between keeping people safe and maintaining mission readiness. The other distances listed are either too close to risk direct strikes or too far to reflect the typical danger window from a nearby storm.

Lightning safety on the flight line is about keeping a protective distance from a lightning threat. The standard guideline is to stop flight-line operations and seek shelter when lightning is within five miles. This five-mile buffer gives a practical margin because lightning can strike outside the visible area of a storm, and conditions can worsen quickly, leaving little time to react if you stay exposed. In practice, you’ll often use the flash-to-bang cue: if you hear thunder soon after a lightning flash, the storm is nearby—roughly within a few miles—and you should seek shelter. Five miles represents a conservative balance between keeping people safe and maintaining mission readiness. The other distances listed are either too close to risk direct strikes or too far to reflect the typical danger window from a nearby storm.