Preliminary findings have not pointed to what caused after taking off from late last month.
The National Transportation Safety Bureau released its preliminary reports just days after the Aug. 26 crash in which the pilot and his passenger, though injured, survived. A final report can take from 12 to 18 months to complete.
The pilot, whom police identified as Steven Bochter, of Assonet, Mass., and his sole passenger, fiancée Kim Brillo were headed back to Taunton, Mass., after spending the afternoon in East Hampton.
According to the NTSB, the Mooney M20C, a single-engine, low-wing aircraft, "experienced a total loss of engine power on initial takeoff climb from East Hampton Airport."
"The pilot stated he conducted a preflight inspection and no anomalies were noted. He completed an engine start, taxi, and engine run up. No anomalies were noted," the report said.
The official time of take-off from runway 10 was 5:14 p.m.
When the plane was airborne, Bochter retracted the landing gear and flaps, but then "the engine rpm decreased from 2,750 rpm to 2,400 rpm," the report said.
"He verified the carburetor heat was off, and the throttle, propeller, and mixture controls were full forward. He declared an emergency with East Hampton Control Tower and turned left in an attempt to return to a closed runway. During the turn 'the engine became quiet' and the airplane collided with trees," according to the report.
The NTSB categorized the damage as substantial and noted a post-crash fire, which the East Hampton Fire Department doused with a fire repellent foam.
Weather was not a factor, the report said.
The airplane was removed from the woods two days after the crash and will be further examined as part of the investigation.