What is a safety precaution when fueling?

• A. Must not be done within 300 feet of ground radar equipment.
• B. Must not be done within 100 feet of operating airborne type radio or air radar equipment or within 300 feet of ground radar equipment.
• C. Wear goggles, watch gauges to prevent over pressuring fuel cells and watch vents for fuel overflow
• D. Ensure personnel man a fire extinguisher

Answer: (B)

During fueling, keep clear of RF-emitting equipment to avoid ignition risks and interference with aircraft systems. The best rule specifies two clearance zones: at least 100 feet away from airborne type radio or air radar equipment, and at least 300 feet away from ground radar equipment. This covers both the equipment mounted on the aircraft and the ground-based radar, reducing the chance of fuel vapors igniting from electrical or RF sources and preventing interference with critical systems during fueling.

The other options don’t capture these two zones together: one only mentions the ground radar distance, another emphasizes goggles and vent checks without a defined exclusion area, and another focuses on having a fire extinguisher rather than the required distance guidance.