BLOOMSBURG — A sightseeing helicopter that crashed at the Bloomsburg Fair last month spun 2 1/2 times as it dropped before it struck the ground, crashing into a number of vehicles parked at the fairgrounds, said the National Transportation Safety Board.

The final 19 seconds of the Sept. 28 flight, captured on surveillance video, shows the helicopter approaching the helipad in a forward-moving hover, according to a preliminary report by the NTSB.

The helicopter then pitched up and simultaneously began a right clockwise turn before going into the spins, the document states. It came to rest on its side.

The NTSB does not list the probable cause of aviation accidents in its preliminary reports.

The pilot and two passengers were injured in the crash that occurred about 7:30 p.m. The weather was clear and the wind calm, the report states.

The fuselage, tail boom and the main and tail rotors sustained substantial damage, according to a a federal aviation administrator who examined them.

The three-seat Enstrom F-28F helicopter, with the passenger doors removed, was operated by JK&J Shop HeliAir LLC. It was powered by a 225-horsepower engine manufactured by Lycoming Engines in Williamsport.

The pilot, Kenneth Cordrey, 68, of Delmar, Del., held a commercial pilot certificate with ratings for a helicopter and had 8,400 flight hours, the NTSB says.

He was admitted to Geisinger Medical Center near Danville in critical condition but has since been released.

The passengers, identified as Jennifer Zielewicz, 42, of Trout Run, and Maria Portalatin, 33, of Williamsport, were treated at a hospital and released. No one on the ground was injured.