TRENTON – An airplane pilot was hurt Monday but his two passengers escaped injury when his biplane flipped as he was landing at Hancock County-Bar Harbor Airport, according to an airport official.

Steve Collier of Atlanta had taken off from the airport in the single-engine biplane and was returning from a scenic flight around 10:30 a.m. when his plane flipped onto its back as it was landing, Airport Manager Bob Cossette said.

Cossette said the commercial pilot was injured “slightly” and that the two passengers were unhurt. He said he did not know the names of the passengers on Collier’s plane.

The airport manager said he did not know what caused the biplane to flip as it was landing.

He said the plane appeared to be badly damaged from the accident.

“It looked significant,” Cossette said. He said County Ambulance and Trenton Fire Department responded to the accident, but that there was no fire at the accident scene.

Cossette said a Federal Aviation Administration official who was driving by the airport and witnessed the accident is looking into why the plane flipped over.

Attempts Monday afternoon to contact federal transportation safety officials about the accident were unsuccessful.

Attempts to contact Collier also were unsuccessful. A message left at his business, Biplane Rides Over Bar Harbor, was not immediately returned.

The outgoing message for the business bills it as “home of Bar Harbor’s most exciting open-cockpit biplane ride.”

Collier was taken by ambulance to Maine Coast Memorial Hospital in Ellsworth but, according to a hospital spokesman, later was transported to Eastern Maine Medical Center in Bangor. Officials at the Bangor hospital said they had no information on Collier.