What actions must a ground crew take if they observe lightning within a five-mile radius of the airfield?

If a ground crew observes lightning within a five-mile radius of the airfield, immediate and specific actions must be taken to ensure safety. The first action is to immediately suspend all outdoor operations. This includes fueling, baggage handling, aircraft pushback, and any other activities that require personnel to be outside. Direct everyone to seek shelter indoors. Acceptable shelters include airport buildings, hangars, or ground service vehicles. Vehicles offer some protection, but it's essential to avoid touching any metal parts. Notify the air traffic control tower (ATCT) and other relevant airport authorities of the lightning activity. This ensures that all parties are aware of the hazard and can take appropriate precautions. Ground crews should remain indoors for at least 30 minutes after the last observed lightning strike. Lightning can strike again even after a period of inactivity. Disconnect ground power units (GPUs) from aircraft to prevent electrical surges. Lightning strikes can induce high-voltage surges that can damage aircraft electrical systems. Avoid using radios or cell phones during the lightning activity, as these devices can attract lightning. Stay away from windows and doors during the lightning activity. These areas are more vulnerable to lightning strikes. Secure any loose equipment or materials that could be blown around by strong winds associated with thunderstorms. After the lightning activity has subsided, inspect the airfield for any damage. This includes checking for downed power lines, damaged equipment, and any other hazards. Report any damage to the appropriate authorities. Resume outdoor operations only after the all-clear has been given by the ATCT or other designated authority. Regular training on lightning safety procedures is essential for all ground personnel. Understanding the risks associated with lightning and the proper precautions to take can save lives. Adherence to these procedures is crucial for maintaining a safe airport environment during thunderstorms.