Aircraft Disappeared from Radar During Instrument Departure (N81X)

Incident Overview and Radar Data The pilot was conducting an instrument departure when air traffic control instructed the aircraft to level off at 3,000 feet. After receiving clearance to continue climbing to 6,000 feet and join the airway, radar data indicated the aircraft began a right turn and climbed to 3,300 feet. The aircraft then descended to 3,200 feet for approximately 20 seconds while continuing the right turn. This turn and descent persisted until the aircraft disappeared from radar at 2,600 feet, located 0.5 nautical miles from the accident site. ## Witness Accounts and Final Approach Witnesses reported overcast conditions near the accident site. One witness observed the aircraft flying wings level just above the treetops. The aircraft then rolled left and, with no change in engine power, descended into the water in a left-wing-low attitude. ## Post-Accident Findings The post-accident investigation found no evidence of mechanical failure or malfunction.