What is the emergency procedure for isolating a malfunctioning ground power unit (GPU) connected to an aircraft?

The emergency procedure for isolating a malfunctioning Ground Power Unit (GPU) connected to an aircraft is designed to quickly disconnect the power supply and prevent damage to the aircraft's electrical system or injury to personnel. The first step is to immediately disconnect the GPU cable from the aircraft. Most GPU cables have a quick-disconnect mechanism that allows for rapid removal. Activate this mechanism to separate the cable from the aircraft's external power receptacle. Simultaneously, shut down the GPU. Locate the emergency shut-off switch on the GPU and activate it. This will immediately cut off power to the unit. Alert the flight crew and ground control to the malfunction. Provide them with specific details about the nature of the problem. If there are any signs of fire, smoke, or arcing, immediately activate the fire suppression system. Use a fire extinguisher that is appropriate for electrical fires. Evacuate the area around the GPU and aircraft, establishing a safety perimeter to prevent unauthorized access. Inspect the aircraft's external power receptacle and the GPU cable for any signs of damage. If damage is found, the aircraft should be inspected by qualified maintenance personnel before it is released for flight. Do not attempt to restart the GPU until it has been inspected and repaired by qualified maintenance personnel. After the emergency has been resolved, complete a detailed incident report. The report should include the date, time, location, type of GPU, nature of the malfunction, and the actions taken. The report will be used to investigate the cause of the malfunction and to prevent future occurrences. It is crucial to follow these procedures calmly and deliberately to minimize the risk of further damage or injury. Regular training on emergency procedures is essential for all personnel who operate or work near GPUs.