A National Transportation Safety Board report issued last week quotes the daughter of one of the passengers as saying the pilot made the emergency landing because of a wiring problem in the propeller governor, which limits the speed of the propeller.
The single-engine plane crashed Aug. 4 in the mountains near Rollinsville, killing everyone aboard.
Authorities identified the victims as the 70-year-old pilot, John Howard of Sunnyvale, Calif., and his passengers, Catherine Heveran, 56, of Sunnyvale and James Chatham, 25, of Spokane.
The plane took off from Boulder en route to San Jose, Calif.
The NTSB has not determined the cause.
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