On May 28, 2019, about 1710 Pacific daylight time, a Sikorsky UH-19D helicopter, N955TC, was substantially damaged when it was involved in an accident near Brewster, Washington. One pilot received minor injuries, while the second pilot was uninjured. The helicopter was operated under the provisions of Title 14 Code of Federal Regulations Part 91 as an evaluation flight.

The day after the accident, Federal Aviation Administration (FAA) inspectors interviewed the pilot-in-command (PIC) who informed the inspectors that the purpose of the flight was to evaluate the other pilot as a “new job applicant” for cherry drying flights. The applicant-pilot was flying the helicopter when the PIC heard a “bang”, observed the over-speed on the tachometer and saw the “applicant-pilot” frozen on the controls. The PIC took over the controls and executed an autorotation from about 20-50 ft agl. The helicopter subsequently landed hard, separating the tailboom from the fuselage and collapsing the landing gear, which resulted in substantial damage. The applicant-pilot was uninjured but remained in the hospital and was discharged the next day with no forwarding address or phone number. The FAA inspectors and the operator surmised that the main drive line system clutch and torque converter failed, which resulted in the engine over-speed.

The NTSB investigator attempted to contact the operator to discuss future examination of the helicopter and to obtain the NTSB Pilot/Operator Aircraft Accident/Incident Report Form 6120.1. However, all attempts to contact the operator were unsuccessful, and the proposed follow-up examination of the helicopter by the NTSB was not performed.