NTSB Identification: LAX82FA341
14 CFR Part 91: General Aviation
Accident occurred Saturday, September 11, 1982 in SAN DIEGO, CA
Probable Cause Approval Date: 09/11/1983
Aircraft: BELL 47G-2, registration: N4242A
Injuries: 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.

THE PLT WAS IN THE LOCAL PATTERN PRACTICING MANEUVERS. AFTER COMPLETING A QUICK STOP MANEUVER & HOVERING, ANOTHER TAKEOFF WAS INITIATED. THE PLT STATED THAT IT SEEMED TO TAKE AN UNUSUAL AMOUNT OF FORWARD CYCLIC TO INITIATE FORWARD FLT. DURING THE FINAL APPROACH FULL FORWARD CYCLIC WAS NOT SUFFICIENT TO MAINTAIN FORWARD FLT. THE ACFT STOPPED SHORT OF THE LANDING SPOT & STARTED BACKING UP. THE ACFT STRUCK THE GROUND AS THE PLT ATTEMPTED TO RECOVER. THE BROKEN SUPPORT ASSEMBLY FORE & AFT CYCLIC CONTROL, P/N 47-724-132-1, WAS EXAMINED & FOUND TO BE A VERY POOR QUALITY CASTING. COLD SHUTS & SHRINKAGE CAVITIES WERE OBSERVED ON OVER APPROXIMATELY 70% OF THE FRACTURE SURFACE. IT WAS CONCLUDED THAT THE FORE & AFT CYCLIC CONTROL FAILED BY A SLOW FRACTURE PROCESS INITIATED BY THE PRESENCE OF LARGE CASTING DEFECTS.

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

ROTORCRAFT FLIGHT CONTROL,CYCLIC BELLCRANK..INADEQUATE

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

MATERIAL DEFECT(INADEQUATE QUALITY OF MATERIAL)..MANUFACTURER

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

ROTORCRAFT FLIGHT CONTROL,CYCLIC BELLCRANK..FATIGUE

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

ROTORCRAFT FLIGHT CONTROL,CYCLIC BELLCRANK..FAILURE,TOTAL

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