What precaution should be taken when fueling an aircraft?

When fueling an aircraft, ensuring correct fuel usage and grounding the aircraft are critical precautions. Correct fuel usage refers to using the type and grade of fuel specified by the manufacturer, which is vital for safe operation and engine performance. Using the wrong fuel can lead to severe mechanical issues or even engine failure.

Grounding the aircraft while fueling is equally important. This process involves connecting a grounding strap from the aircraft to a grounded object or the fuel source to prevent static electricity buildup, which could ignite fuel vapors. Since fuel is highly flammable, taking this precaution minimizes the risk of fire or explosion during the fueling process, thereby protecting both the aircraft and personnel involved.

Other options may not address the most critical safety concerns associated with aircraft fueling. For instance, while using self-service fuel pumps can be convenient, it does not inherently guarantee that proper fueling procedures will be followed. Similarly, although storing fuel in non-flammable containers is important for safety, it pertains more to fuel storage rather than the direct process of fueling an aircraft. Finally, while using the highest grade of fuel may seem beneficial, it is not always necessary or recommended as it depends on the specific requirements of the aircraft. Hence, focusing on the correct fuel type and grounding the aircraft is the most