The preliminary report posted Saturday by the National Transportation Safety Board said witnesses noticed an unusually long and slow takeoff by the Socata TB10 - a model known as the "Tobago."
The pilot and a passenger were killed and third badly injured in the Aug. 19 crash.
No flight plan was filed for the trip.
Witnesses reported that after the single-engine propeller plane took off and disappeared from view, a large smoke plume appeared out of the trees near the airport.
The plane collided with trees and a large trash bin in a residential area. Neighbors tried to put out the flames with a garden hose.
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