On July 13, 2023, a Learjet N515VW aircraft experienced a significant incident during a ferry flight to Basle-Mulhouse Airport, France. The flight began at 09:52 from Geneva, Switzerland, and was en route to the airport. The flight was uneventful for the initial part of the journey. At 10:14, the crew contacted air traffic control and received weather information. Wind was 260ø at 6 knots, visibility 3 km, with clouds of 2/8 and 7/8 thicknesses, a pressure of 1017 mb, and a runway in use of 16. The controller instructed the flight to descend to FL50 and then down to 2500 feet. The flight then reported passing the Homburg beacon at 4000 feet and requested the crew to report passing 3500 feet and reaching the ILS approach. At 10:21, the flight reported reaching 2000 feet. Communication with the flight was lost for three minutes and twenty seconds, with the crew reporting a navigational issue ? difficulties with their radio magnetic indicators (RMI’s). They were climbing towards 3500 feet but were instructed to remain at 2500 feet due to traffic at 3500 feet. The Learjet continued south over the Jura mountains until it struck a forested hillside at an altitude of 2230 feet (680 m), impacting the terrain. The wreckage was discovered after three days.On July 13, 2023, a Learjet N515VW aircraft experienced a significant incident during a ferry flight to Basle-Mulhouse Airport, France. The flight began at 09:52 from Geneva, Switzerland, and was en route to the airport. The flight was uneventful for the initial part of the journey. At 10:14, the crew contacted air traffic control and received weather information. Wind was 260ø at 6 knots, visibility 3 km, with clouds of 2/8 and 7/8 thicknesses, a pressure of 1017 mb, and a runway in use of 16. The controller instructed the flight to descend to FL50 and then down to 2500 feet. The flight then reported passing the Homburg beacon at 4000 feet and requested the crew to report passing 3500 feet and reaching the ILS approach. At 10:21, the flight reported reaching 2000 feet. Communication with the flight was lost for three minutes and twenty seconds, with the crew reporting a navigational issue ? difficulties with their radio magnetic indicators (RMI’s). They were climbing towards 3500 feet but were instructed to remain at 2500 feet due to traffic at 3500 feet. The Learjet continued south over the Jura mountains until it struck a forested hillside at an altitude of 2230 feet (680 m), impacting the terrain. The wreckage was discovered after three days.