The National Transportation Safety Board is investigating what caused a Skyworld charter plane, which carried 185 passengers, to tilt and drag its left engine for 500 feet while landing at Salt Lake International Airport Sunday.

While no injuries were reported as a result of the rough landing, the Morris Agency charter plane and the runway were damaged.The damaged plane was arriving in Salt Lake City after a flight from Honolulu.

Federal Aviation spokesman Mitch Barker reported that the plane was not flying at a straight angle when it landed on its left side.

Crew members aboard the aircraft have refused to talk with FAA investigators. They will file a written report on the incident.

The president of the company that owns Skyworld, Bill Boister, said that the aircraft and air crew were in full compliance with company policies and FAA regulations.

Cost to repair the damaged aircraft has not been determined.