Not long ago, an MQ-9 "Death God" drone from the US military encountered interception from Russian Air Force fighter jets over the Black Sea, and later fell into the sea. Both the United States and Russia hold their own opinions on the rationality of the action. The United States later released relevant videos and insisted that Russian fighter jets "repeatedly sprayed fuel on drones" in the air. Why is an aircraft designed with a "spill fuel" function? What can 'splashing fuel' do? In fact, "splashing fuel" is just a colloquial term, and its term is called "emergency refueling in the air". From a global perspective, some fighter jets and heavy civil aircraft possess this capability. This is because airplanes often carry enough fuel during takeoff. But once encountering emergency returns or even forced landings, the large stock of fuel becomes a burden or even a "bomb". Only by rapidly releasing it in the air can the total weight of the aircraft be less than the maximum allowable landing weight, preventing damage to the aircraft body and landing gear during landing, and reducing the possibility of explosion accidents. The emergency oil discharge system of fighter jets usually consists of an oil pump, an emergency oil discharge manifold, an emergency oil discharge solenoid valve, an oil discharge port, and a control circuit. Under the collaborative efforts of these facilities, the emergency fuel release speed of fighter jets is very fast, with an average of about half a ton per minute. During this process, in order to maintain a balance of pressure inside and outside the fuel tank, some compressed air will be added to the tank at the same time to prevent the tank from being compressed and deformed under negative pressure. There are many restrictions on emergency oil release in the air. If operated according to the prescribed procedures, it generally will not affect pedestrians on the ground. Because as soon as the fuel exits the discharge port, it begins to atomize and become small oil droplets. The farther it is from the ground, the more dispersed the distribution of the oil droplets becomes. But if other aircraft are very close to the fuel discharge port at the tail of the fighter, then it's a different story. Taking the turboprop aviation engine of the MQ-9 Death drone as an example, this engine places great emphasis on suction efficiency. Once a large amount of aviation fuel is sucked into the intake duct, the engine after being "choked" will find it difficult to operate stably, and may even experience air parking. If the sensors, antennas, and other devices of unmanned aerial vehicles are "smeared" by oil mist, the crucial aviation attitude adjustment system, communication system, and navigation system will be affected, and in severe cases, it can lead to the unmanned aerial vehicle losing control and crashing. More details need to be released to confirm the authenticity of the Russian fighter jet "oil spill" incident involving US drones. If this is the case, it also proves from another perspective that the amount of "fuel splashed" by fighter jets in the air is indeed large enough and the speed is also fast enough. (New News Agency)