NTSB Identification: FTW91LA098.
The docket is stored on NTSB microfiche number 43125.
Nonscheduled 14 CFR
Accident occurred Monday, June 17, 1991 in SHIP SHOAL 290K
Probable Cause Approval Date: 07/13/1993
Aircraft: SIKORSKY S76A, registration: N5418N
Injuries: 10 Serious.

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 A LANDING AT AN OFF SHORE OIL RIG THE PILOT IN COMMAND (PIC) ALLOWED THE HELICOPTER TO DRIFT AND PLACED THE RIGHT MAIN GEAR OFF THE PLATFORM ONTO THE SAFETY APRON. THE PIC UNSUCCESSFULLY ATTEMPTED TWO REPOSITIONING MANEUVERS AND THEN DECIDED TO TAKEOFF AND LAND AGAIN. DURING THE TAKEOFF FROM A HOVER THE PIC APPLIED INCREASED COLLECTIVE. THE HELICOPTER RESPONDED BY TURNING RIGHT AROUND ITS VERTICAL AXIS. THE CO-PILOT (CP) INTERPRETERED THE RIGHT TURN AS A LOSS OF DIRECTIONAL CONTROL, SO HE BROUGHT BOTH ENGINES OFF LINE BY REDUCING THE SPEED LEVERS TO GROUND IDLE. THE ACTION OF THE CP WAS TAKEN WITHOUT COORDINATION OR ANNOUNCEMENT TO HIS PIC. THE MAIN ROTOR BLADES STRUCK THE PLATFORM AND THE HELICOPTER DESCENDED UNCONTROLLED TO THE WATER. NO MECHANICAL MALFUNCTIONS WERE DISCOVERED.

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

THE COPILOT'S REDUCTION OF POWER TO GROUND IDLE ON BOTH ENGINES. FACTORS WERE THE PILOT'S POOR LANDING TECHNIQUE AND HIS FAILURE TO ESTABLISH ADEQUATE CREW COORDINATION.

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