Piper PA32RT accident near St Ignace, Michigan, September 1, 2018

The NTSB's narrative final · quoted from the NTSB record

The instrument-rated pilot took off in dark night conditions over a lake that bordered the departure end of the runway. The airport manager witnessed the airplane depart and reported that the takeoff sounded normal. Two witnesses who were facing the lake reported that they observed an aircraft take off from the airport, and fly about 100 to 200 ft above the lake surface. It then banked to the right and disappeared from sight. About 10 to 15 seconds later, the witnesses heard what sounded like a crash into the water or an explosion. There were no distress radio calls from the pilot and there was no radar information for the flight. The airport manager and first responders reported that it was a very dark night and that there was no distinguishable horizon. Examination of the airframe and engine did not reveal any preimpact anomalies that would have precluded normal operation, and evidence was consistent with a slight right wing down, nose low, high speed impact with the water. A right turn would have been necessary at some point after takeoff to fly towards the destination airport and evidence is consistent that a right turn had been initiated. Although the reason for the impact with the water could not be determined, the overwater departure in dark night conditions would not have provided adequate visual cues to assure a positive rate of climb during the departure and initial turnout on course as a pilot would be vulnerable to illusions if flight instruments were not used to conduct the takeoff and initial climb.

The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.