Primary finding
Probable cause
The landing capability of the airplane was exceeded. The lack of performance data was a factor in the accident.
Investigator assessment
Analysis narrative
The pilot was conducting a functional test flight and qualitative engineering evaluation of the airplane's longitudinal control during landing. During final approach to runway 12l, he reduced the engines to the flight idle positions and established 95 kias. He was unable to raise the nose of the airplane during the flare to arrest the descent rate and landed hard onto the runway. The airplane was taxied to the ramp and secured. No mechanical failure was found or reported.
Source record
Factual narrative
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