NTSB Identification: FTW83IA131.
The docket is stored on NTSB microfiche number 25586.
Nonscheduled 14 CFR
Incident occurred Tuesday, March 01, 1983 in E. CAMERON
Aircraft: AEROSPATIALE AS-350D, registration: N3593D
Injuries: 4 Uninjured.

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

DURING AN APPROACH TO AN OIL DRILLING RIG PLATFORM, THE ENGINE DECELERATED AS THE PILOT STARTED TO ALL POWER. WITH THE ACFT BELOW THE LANDING AREA, HE MANEUVERED TO MISS THE PLATFORM & INITIATED AN AUTOROTATIVE LANDING. HE MADE A MAYDAY CALL & TRIED TO ELECTRICALLY DEPLOY THE EMERGENCY FLOATS; HOWEVER, THE RIGHT FLOAT FAILED TO INFLATE & THERE WAS INSUFFICIENT TIME FOR MANUAL DEPLOYMENT. IMMEDIATELY ON TOUCHDOWN, THE HELICOPTER ROLLED OVER & BEGAN TO FILL WITH WATER. REPORTEDLY, THERE WAS ONLY MINOR DAMAGE FROM WATER IMMERSION. NO PREIMPACT DISCREPANCIES WERE FOUND THAT WOULD HAVE CAUSED THE POWER LOSS. THE WIRES TO THE RIGHT FLOAT (FOR ELECTRICAL DEPLOYMENT) WERE WORN IN TWO AT A CENTER HEX HEAD SCREW. A FLEET INSPECTION OF 37 ACFT REVEALED THAT 60% WERE WORN THRU IN THE SAME AREA.

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

REASON FOR OCCURRENCE UNDETERMINED

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

ELECTRICAL SYSTEM,ELECTRIC WIRING..CHAFED

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

ELECTRICAL SYSTEM,ELECTRIC WIRING..OPEN

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

LANDING GEAR,FLOAT ASSEMBLY..INOPERATIVE


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND

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