Controller Then Immediately Issued Two Low Altitude Alerts With No Response From The Pilot
On July 13, 2021 about 1042 Pacific daylight time, a Cessna 421C, N678SW, was destroyed when it was involved in an accident near Monterey, California. The pilot and passenger were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. Review of recorded communication from the Monterey air traffic control tower revealed that the pilot canceled their initial instrument flight rules (IFR) clearance and requested a Visual Flight Rules (VFR) on top clearance.