How should you approach a suspected fuel leak during preflight?

• A. Ground stop, secure fuel source, isolate affected area, notify maintenance, and do not dispatch until cleared.
• B. Proceed with flight while monitoring fuel levels.
• C. Ignore leak if the smell is faint.
• D. Refuel with the airplane still connected.

Answer: (A)

When you suspect a fuel leak during preflight, the priority is to halt any flight operation and manage the risk until the issue is inspected and cleared. Start by putting the aircraft on ground stop—no movement—so you don’t add ignition sources or complicate the situation. Then secure the fuel source by shutting off or isolating the fuel supply to stop any more fuel from continuing to flow. Next, isolate the affected area to keep people away from the leak and any vapors, reducing exposure to fuel and preventing ignition sources from being introduced near the leak. Notify maintenance right away so trained personnel can assess and repair the leak and determine airworthiness. Finally, do not dispatch until maintenance has inspected the aircraft and cleared it for flight. This approach prioritizes safety and proper verification before any further action.

The other options miss the fundamental safety requirement: continuing to flight, even with monitoring, ignores the risk of a leak worsening or igniting; ignoring a leak because it smells faintly downplays the potential danger; refueling with the airplane still connected keeps fuel in contact with the system and potential leaks, increasing fire risk.