What are the immediate steps to take if a fuel truck experiences a brake failure while positioned near an aircraft?

If a fuel truck experiences brake failure while positioned near an aircraft, immediate action is critical to prevent a collision or fuel spill. The first and most crucial step is to immediately activate the emergency brake or secondary braking system. Fuel trucks are equipped with redundant braking systems specifically for this type of emergency. Simultaneously, alert the flight crew, ground control, and any nearby personnel about the brake failure. Use the truck's horn and emergency lights to warn others of the imminent danger. If the emergency brake is ineffective and the truck is moving, steer the truck away from the aircraft and any personnel, attempting to guide it towards an open area or a soft barrier, such as a grassy area or a sand-filled safety pit, if available. If a collision is unavoidable, attempt to minimize the impact by steering the truck to hit the aircraft wing tip rather than the fuselage or engine. Shut down the engine to eliminate any potential ignition source. After the truck has stopped, immediately activate the fuel truck's emergency shut-off valve to prevent any fuel spillage. Evacuate the area around the fuel truck and aircraft, establishing a safety perimeter to prevent unauthorized access. Report the incident to the airport emergency services, providing them with all relevant details, including the location, type of truck, and any potential hazards. Do not attempt to move the truck until it has been inspected by qualified maintenance personnel and the cause of the brake failure has been determined. A thorough investigation of the incident should be conducted to identify the root cause of the brake failure and implement preventative measures to avoid future occurrences. This may involve reviewing maintenance procedures, driver training, and equipment inspection protocols.