NTSB Identification: MIA89LA204.
The docket is stored on NTSB microfiche number 39396.
Accident occurred Friday, July 21, 1989 in GREENWOOD, MS
Probable Cause Approval Date: 09/05/1991
Aircraft: Texas Helicopter OH-13E/M74, registration: N47345
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

DURING CRUISE FLT, THE HELICOPTER WENT OUT OF CONTROL & BEGAN AN UNCOMMANDED DESCENT. THE CYCLIC & COLLECTIVE CONTROLS WERE NON-RESPONSIVE, BUT LEFT PEDAL WAS APPLIED BEFORE THE HELICOPTER CRASHED & IT CRASHED IN A TAIL LOW ATTITUDE. AN EXAM OF THE FLT CONTROLS REVEALED THAT ONE MAIN ROTOR BLADE PITCH CHANGE HORN HAD FAILED, AS WELL AS THE ATTACHING BOLTSFOR BOTH PITCH CHANGE HORNS. THERE WAS EVIDENCE THAT ONE OF THE BOLTS HAD FAILED, THEN THE OTHER FAILURES WERE FROM OVERLOAD.

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

FAILURE OF A MAIN ROTOR BLADE PITCH CHANGE HORN AND/OR ATTACHING BOLT(S).

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