A military GPS jamming exercise is linked to a recent plane crash in New Mexico
The aircraft, a twin-engine Beechcraft King Air, was carrying several individuals when it collided with terrain.
Although the GPS jamming did not directly cause the crash, investigators believe it was a key starting point in a sequence of errors. Pilots of the medevac flight reported losing GPS capability minutes before the accident, prompting them to switch from instrument-based navigation to visual flight rules. This transition occurred under moonless conditions, which made it difficult for the pilots to identify the horizon and navigate safely.
Challenging flight conditions
The flight began under extremely dark conditions, with no moonlight to assist visibility. This kind of night presents a known challenge for pilots flying visually, as the lack of illumination can lead to spatial disorientation. Pilots often rely on instruments in such situations, and it was clear from the preliminary report that they had planned for an instrument flight. The Beechcraft departed from Roswell Air Center at approximately 11:52 pm and climbed to its assigned altitude. Albuquerque Center, the local air traffic control center, had approved an instrument flight rules (IFR) clearance for the flight.
The use of IFR is a standard procedure in aviation, especially during low-visibility conditions. However, the pilot quickly encountered problems with GPS signals. At around midnight, air traffic control informed the pilots they were flying slightly above their assigned altitude. The crew acknowledged the issue but immediately revealed that they had lost GPS functionality. With GPS guidance gone, they requested and received a heading adjustment to direct them toward their destination airport.
Just a few minutes later, the pilots transitioned to visual flight rules. According to the NTSB, they claimed to have established visual contact with Ruidoso, a town near their destination. This shift in navigation methods, under dark conditions, marked a pivotal moment in the flight.
Visual flight under pressure
As the Beechcraft approached its destination, the pilots relied on the lights of Ruidoso to guide them toward the Sierra Blanca Regional Airport. However, an imposing natural barrier—the Capitan Mountains—stood between them and the airport. These mountains rise above 10,000 feet, and the pilots were flying at an altitude of around 9,820 feet, according to the aircraft's instruments.
The lack of light made it nearly impossible for the pilots to recognize the terrain ahead. With Ruidoso’s lights as their only visual reference, they likely began descending too early, assuming the path to the airport was clear. The NTSB report suggests that once they lost sight of the town, they realized they were approaching a massive obstacle. In response, they attempted to climb, but at high speeds and under stress, their efforts were too late.
The aircraft ultimately crashed into terrain at about 9,950 feet, just below the Capitan Mountains Summit Radio Facility. The impact was severe, and all onboard were killed. Investigators believe this is a case of controlled flight into terrain (CFIT), where pilots remain in control of the aircraft but mistakenly descend into an obstacle.
Military jamming and its consequences
The GPS jamming exercise by the U.S. military occurred just before the flight's final moments. After the pilots reported their GPS loss, air traffic control contacted the military and requested them to halt the interference. Minutes later, the GPS signal was restored. However, by then, the pilots had already switched to visual navigation, which proved fatal under the challenging conditions.
Though the military's GPS jamming did not directly cause the crash, it undoubtedly played a role in the chain of events. This incident has raised urgent questions about how often such GPS disruptions occur and whether there are measures in place to prevent them from interfering with civilian aviation. The NTSB has not yet issued a final report on the crash, but the findings so far highlight the critical nature of GPS in modern aviation and the potential risks of interference.
As the investigation continues, the aviation community and military authorities are being urged to consider the broader implications of GPS jamming exercises. With global reports of GPS interference rising, the need for better coordination and communication between military operations and civilian air traffic is more pressing than ever.
This tragic event underscores the delicate balance of modern flight operations and the crucial role of reliable GPS navigation. For now, the focus remains on understanding the full sequence of events and implementing measures to prevent similar tragedies in the future.