NTSB Identification: DEN82FA148
14 CFR Part 91: General Aviation
Accident occurred Thursday, July 29, 1982 in MEDORA, ND
Probable Cause Approval Date: 07/29/1983
Aircraft: ENSTROM F-280, registration: N4202S
Injuries: 1 Fatal,3 Serious,1 Minor.

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.

DURING FLT THE PLT NOTICED THAT ENG RPM WAS ABOUT 500 OVER ROTOR RPM. THE ACFT CRASHED DURING AN UNSUCCESSFUL AUTOROTATION. THE OVERRUNNING CLUTCH LINKAGE & CLUTCH WAS FOUND IN THE DISENGAED POSITION. A SUCCESSFUL AUTOROTATION REQUIRES THAT THE COLLECTIVE CONTROL LEVER BE PLACED IN THE FULL DOWN POSITION & THE HELICOPTER POSITIONED IN A DESCENT SO AS TO MAINTAIN APPROXIMATELY 60 MPH FORWARD AIRSPEED & THE M/R BLADE SPEED KEPT WITHIN THE GREEN ARC ON THE TACHOMETER.

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

ROTOR DRIVE SYSTEM,CLUTCH ASSEMBLY..DISABLED

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

COLLECTIVE..ATTEMPTED..PILOT IN COMMAND

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

ROTOR RPM..NOT MAINTAINED..PILOT IN COMMAND

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