Accident Overview
On an unspecified date, a multi-engine aircraft departed from Montrose Airport. During the initial climb, as the aircraft reached an altitude of approximately 1,000 feet, it executed an uncommanded left bank to an angle of 55°. Subsequently, the airplane stalled and descended uncontrollably, impacting the ground with a huge explosion. The force of the impact and the resulting post-crash fire destroyed the aircraft. Both pilots onboard were killed.
Probable Cause
The official investigation determined the probable cause of the accident was a loss of control during the initial climb after the left engine thrust reverser deployed. The following factors were reported in the investigation:
- Improper operations of the powerplant,
- The pilot-in-command failed to follow approved procedures,
- Improper emergency procedures,
- Unwanted thrust reversal,
- Continued operation of the left engine at climb power after the unwanted in-flight deployment of the left engine thrust reverser.
Sequence of Events
After takeoff, while climbing through 1,000 feet, the aircraft experienced an unwanted deployment of the left engine thrust reverser. The flight crew continued to operate the left engine at climb power despite the deployment. This led to an asymmetric thrust condition, causing the airplane to bank sharply to the left. The bank angle reached 55°, at which point the aircraft stalled. The crew was unable to recover from the stall before the aircraft crashed.
Damage and Injuries
The aircraft was destroyed by the impact and subsequent fire. Both pilots sustained fatal injuries.
Conclusions
The investigation concluded that the loss of control resulted from the deployment of the left engine thrust reverser, compounded by the pilots' failure to follow proper emergency procedures and their continued operation of the affected engine at climb power.