MEDORA, ND, USA
N4202S
ENSTROM F-280
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.
Source: NTSB Aviation Accident Database
Aviation Accidents App
In-Depth Access to Aviation Accident Reports
