NTSB Identification: DEN01FA113.
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Accident occurred Sunday, June 10, 2001 in Cerrillos, NM
Probable Cause Approval Date: 07/25/2002
Aircraft: Mitsubishi MU-2B-20, registration: N187AF
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

The pilot was maneuvering the airplane south of the airport preparing to make a VFR approach. Witnesses observed the airplane in a right spin. NTAP data showed the airplane to be well above stall speed before disappearing from radar. Examination of the radar data revealed that in 6 seconds, ground speed dropped 31 knots, from 200 knots to 169 knots, and altitude dropped 440 feet, from 11,760 feet to 11,320 feet (4,400 feet per minute). In the next 6 seconds, ground speed dropped another 31 knots, from 169 knots to 138 knots, and altitude dropped 1,020 feet, from 11,320 feet to 10,300 feet (10,200 feet per minute). According to the manufacturer, if the throttles were to be brought back into Beta (flat pitch) range, it is possible that one propeller could go into Beta an instant before the other propeller. If this were to happen, the airplane would instantly snap roll and enter a spiral. The pilot had received an estimated 4 hours of dual instruction in the airplane.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

the pilot's loss of aircraft control inflight for reasons undetermined. Contributing factors were the pilot's inadequate transition/upgrade training and his total lack of experience in aircraft make/model.

Full narrative available

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