What safety precaution should be taken regarding grounding during aircraft fueling?

• A. Only the fueling unit needs to be grounded
• B. No grounding is necessary if precautions are followed
• C. Ground the aircraft, fueling unit, and fueling nozzle
• D. Grounding is only necessary for the aircraft

Answer: (C)

Grounding is a critical safety measure during aircraft fueling to prevent static electricity buildup, which can lead to dangerous sparks and potential fires or explosions. When aircraft are fueled, the possibility of static discharge increases due to the flow of fuel and the movement of the aircraft and fueling equipment.

Grounding the aircraft, fueling unit, and fueling nozzle ensures that any static electricity is safely dissipated. This creates a continuous electrical path from the aircraft to the ground. By grounding all key components involved in the fueling process, you effectively mitigate the risk of static electricity igniting fuel vapors, which is a primary concern during fueling operations.

Grounding only the fueling unit or just the aircraft does not adequately protect against static discharge, as electrical charges can still accumulate on the other components. Additionally, assuming that no grounding is necessary if precautions are followed overlooks the fact that static electricity can still build up under certain conditions, making comprehensive grounding essential for safety.