NTSB Identification: MIA84FA004.
The docket is stored on NTSB microfiche number 23492.
Accident occurred Friday, October 07, 1983 in WEST PALM BEACH, FL
Aircraft: SIKORSKY S-61N, registration: YV323
Injuries: 1 Serious,3 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.

WHILE DESCENDING FOR A LANDING THERE WAS A SEPARATION OF AN OUTBOARD SECTION OF THE MAIN RED ROTOR BLADE. AN OLD CRACK WAS NOTED & THE FRACTURE WAS ATTRIBUTED TO HIGH STRESS LOW CYCLE FATIGUE DAMAGE INITIATING FROM CORROSION PITTING.

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

ROTOR SYSTEM,MAIN ROTOR BLADE..SEPARATION


Contributing Factors

INSUFFICIENT STANDARDS/REQUIREMENTS,AIRCRAFT..FAA(ORGANIZATION)


Contributing Factors

ROTOR SYSTEM,MAIN ROTOR BLADE..STRESS CORROSION


Contributing Factors

ROTOR SYSTEM,MAIN ROTOR BLADE..FATIGUE

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