NTSB Identification: ATL99LA107.
The docket is stored in the Docket Management System (DMS). Please contact Records Management Division
Accident occurred Wednesday, July 14, 1999 in CAMDEN, AL
Probable Cause Approval Date: 11/30/2000
Aircraft: Continental Copters TOMCAT MK5A, registration: N9086T
Injuries: 1 Minor.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot had completed a second pass over the field he was spraying when he lost cyclic control of the helicopter. He reduced power and the helicopter impacted the ground, coming to rest on its right side. The helicopter's cyclic control rod was metallurgically examined. One end of the cyclic control rod had separated at the thread relief radius and the failure appeared consistent with an overstress separation. Hardness readings taken during an ultrasonic inspection revealed the tensile strength was below the original rod design strength.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The failure of the cyclic control rod due to an overstress separation resulting from a material defect (inadequate quality of material) by the manufacturer. Full narrative available
Index for Jul1999 | Index of months