NTSB Identification: FTW82FA145
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Thursday, April 22, 1982 in INTRACOASTAL CI, LA
Probable Cause Approval Date: 04/22/1983
Aircraft: BELL 212, registration: N5752W
Injuries: 2 Fatal,1 Serious,9 Uninjured.

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 WAS IN CRUISE FLIGHT WHEN A SUDDEN AND SEVERE RIGHT YAW OCCURRED. SUBSEQUENTLY, IT WAS AUTOROTATED TO A DITCHING IN ROUGH WATER. TOUCHDOWN WAS MADE ON TOP OF A WAVE, THEN THE HELICOPTER ROLLED OVER. THE SURVIVORS DID NOT GET THE RAFT OUT. ANOTHER HELICOPTER ARRIVED BUT COULD NOT LAND IN THE ROUGH SEA. A LIFE RAFT WAS DROPPED, BUT IT WAS BLOWN DOWNWIND BY THE TIME A SURVIVOR (THE COPILOT) SWAM TO IT AND GOT IT INFLATED. THE COPILOT WAS UNABLE TO PADDLE AGAINST THE WIND TO THE OTHER SURVIVORS. THE HELICOPTER SANK BEFORE A RESCUE BOAT ARRIVED. HOWEVER, IT WAS RECOVERED, LATER. AN INVESTIGATION REVEALED THAT THE FEMALE PORTION OF A TAIL ROTOR COUPLING, PN 204-040-604-5, HAD FAILED DUE TO LACK OF LUBRICATION. THE PROPER TYPE OF LUBRICANT HAD BEEN USED. AN EXAM OF THE COUPLING SEAL, PN 204-040-611-1, REVEALED TEARS AND A CIRCUMFERENTIAL CUT, .14 TO .16 INCH LONG. GREASE WAS FOUND THROUGHOUT THE CUT AREA. THE HELICOPTER HAD ACCUMULATED 1226 HRS TOTAL TIME AND 376 HRS SINCE OVERHAUL.

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..OTHER

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..OVERTEMPERATURE

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..WORN

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

ROTOR DRIVE SYSTEM,TAIL ROTOR DRIVE SHAFT..DISCONNECTED


Contributing Factors

AUTOROTATION..PERFORMED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..WATER,ROUGH

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