NTSB Identification: MIA85FA153.
The docket is stored on NTSB microfiche number 28519.
Accident occurred Saturday, April 20, 1985 in GULF OF MEXICO
Aircraft: SIKORSKY S-58ET, registration: N65526
Injuries: 3 Fatal.

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 HELICOPTER DISAPPEARED WHILE ON AN OVERWATER FLT FROM KEY WEST, FL TO FT PEIRCE, FL. ONE OCCUPANT & THE WRECKAGE OF THE HELICOPTER WERE SUBSEQUENTLY RECOVERED FROM THE GULF OF MEXICO. THE PLT & THE OTHER OCCUPANT WERE NOT LOCATED & WERE PRESUMED DEAD. PRIOR TO DEPARTURE, 1 OF THE CREWMEMBERS WAS OVERHEARD TO SAY 'THAT DIDN'T SOUND GOOD'REFERRING TO SOME UNUSUAL SOUND AT THE TIME OF SHUT-DOWN. THE PLT TOLD A WITNESS THEY WERE HAVING MECHANICAL DIFFICULTY WHICH THEY WOULD CORRECT IN FT PIERCE. ANOTHER WITNESS HEARD THE PLT STATE TO 1 OF THE PAX THAT A CAP OR PART HAD FALLEN OFF & WAS MISSING. AN EXAM OF THE ROTATING & STATIONARY SWASHPLATES WHICH MADE UP THE STAR ASS'Y REVEALED THAT THEY HAD SEPARATED FROM EACH OTHER. A METALLURGICAL EXAM REVEALED THAT 8 OF THE 12 BOLTS WHICH SECURED THE ROTATING STAR INNER RACE TO THE ASS'Y HAD FAILED IN FATIGUE; THE OTHER 4 BOLTS WERE MISSING. THERE WAS EXTENSIVE DAMAGE TO THE BELLY, TAIL CONE & PYLON.

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..PERFORMED..PILOT IN COMMAND

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

ROTORCRAFT FLIGHT CONTROL,SWASHPLATE ASSEMBLY..FATIGUE

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

ROTORCRAFT FLIGHT CONTROL,SWASHPLATE ASSEMBLY..DISCONNECTED



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