Primary finding
Probable cause
the operator’s failure to adequately inspect the former military turbine powered helicopter, which allowed an engine issue to progress and result in a loss of engine power and a subsequent loss of control after the helicopter struck powerlines during a forced landing. Also causal to the accident were the following: 1) the Federal Aviation Administration’s (FAA) inadequate inspection and maintenance standards for former military turbine powered aircraft operating with an experimental exhibition airworthiness certificate; 2) the operator’s use of those standards instead of more rigorous standards, which were readily available to the operator and previously used to inspect and maintain the helicopter; and 3) the FAA’s inadequate oversight of the operator, which did not detect the inherent risk associated with the operation.
Investigator assessment
Analysis narrative
On June 22, 2022, about 1645 eastern daylight time, a Bell Helicopter UH-1B helicopter, N98F, was destroyed when it was involved in an accident in Amherstdale, West Virginia. About 15 minutes after the flight departed, the helicopter impacted two powerlines and a rock face during a forced landing, and a postcrash fire ensued. The pilot and five passengers were fatally injured. The helicopter was operated by MARPAT Aviation under the provisions of Title 14 Code of Federal Regulations Part 91