In recent years, fixed wing fighter jets, helicopters, and military drones have repeatedly encountered "black flying" (unauthorized flight) during takeoff and landing stages worldwide. On May 22nd, over Manning Airport in Bavaria, Germany, a typhoon fighter jet collided with a "black flying" drone during landing, which once again drew attention to such incidents. Normally, the fire control radar, collision avoidance radar, optoelectronic/infrared search equipment, etc. equipped on fighter jets (including fixed wing fighters and helicopters) can also be used to monitor drones flying at low altitudes. Why would such accidents still occur? Firstly, when a fighter jet takes off, lands, or goes around, it is flying in the troposphere at a low altitude with unstable airflow. In addition, the flight speed of the fighter jet during this stage is limited, and once special circumstances occur, the pilot has very little room to control the fighter jet for correction. Therefore, pilots will concentrate and pay close attention to the changes in important parameters such as the aircraft's flight attitude, landing gear status, engine temperature, navigation information, and have no time to consider others. Secondly, the fire control radar and optoelectronic/infrared search equipment of fixed wing fighter jets are mainly designed to detect fast flying targets; The anti-collision radar on helicopters and drones is mainly used to avoid obstacles on the ground during ultra-low altitude flight. It can be seen that searching for drones characterized by "low, slow, and small" is not the specialty of these detection devices. In addition, to ensure safety, fixed wing fighter jets usually turn off their fire control radar during takeoff and landing phases. Black flying drones are generally not equipped with secondary radar responders, and their flight paths are also irregular. Once these drones are outside the perspective of onboard electro-optical/infrared search equipment, they are difficult to detect. Since it is not possible to effectively detect drones that are "black flying" at this stage with onboard equipment, how can we solve such problems? The answer is to do a solid job in prevention. Establishing airport clearance zones is a unified practice in various countries. The clearance zone refers to the clean near ground space designated around the airport to ensure safe takeoff and landing of aircraft. In this space, the height of buildings and obstacles is strictly limited, and drones, kites, power umbrellas, gliders, hot air balloons, and even birds are not allowed to enter. They are also equipped with anti-collision lights. For a long time, an important reason for the "black flight" of fighter jets from various countries is the "unclean" clearance zone. This requires further improvement of the joint management and control mechanism, strengthening the promotion of aviation safety laws, and relying on administrative and legal means to manage drones from the source. At the same time, it is necessary to enrich detection and countermeasures in order to provide timely warning and respond to critical situations. On the one hand, it is necessary to strengthen early warning capabilities and build an air intelligence early warning system composed of detection equipment from different angles and levels, in order to improve the detection, recognition, and tracking capabilities of low altitude and ultra-low altitude targets. On the other hand, it is necessary to enrich countermeasures and promptly eliminate any "black flying" drones discovered. Among them, it includes the use of soft killing methods, that is, the use of professional equipment for electromagnetic suppression, interference and blocking of drone reception control signals, causing it to lose control, crash or land, as well as the use of laser weapons, drones, and conventional firepower for hard damage at critical moments to ensure the safety of the aircraft. (Lai Xin She)