NTSB Identification: FTW90FA046.
The docket is stored on NTSB microfiche number 41964.
Nonscheduled 14 CFR
Accident occurred Wednesday, December 27, 1989 in S MARSH IS 7
Probable Cause Approval Date: 09/05/1991
Aircraft: BELL 206L-1, registration: N3913S
Injuries: 3 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.

THE HELICOPTER HAD BEEN LOADED NEAR ITS MAX GROSS WT LIMIT OF 4150 LBS. THE PLT RPRTD THAT DURING AN APCH TO AN OFFSHORE PLATFORM IN THE GULF OF MEXICO, THERE WAS VIRTUALLY NO WIND. AS THE APCH SPEED DROPPED BELOW EFFECTIVE TRANSLATIONAL LIFT, THE PLT NOTED A SHUDDER THAT DID NOT SEEM NORMAL, SO HE INITIATED A GO-AROUND. AS HE APPLIED POWER & PEDAL TO GO AROUND, THE ACFT SPUN TO THE RGT & THE NOSE TUCKED. THE PLT TRIED TO CORRECT THE SITUATION, BUT WAS UNABLE. HE RPRTD THAT JUST BEFORE WATER IMPACT HE LEVELED THE HELICOPTER, DEPLOYED THE EMERG FLOATS & APPLIED FULL COLLECTIVE PITCH. ALSO, HE STATED THE RATE OF SPIN DECREASED AS HE APPLIED COLLECTIVE PITCH. ONE OF THE LEFT FLOATS SEPARATED ON WATER ENTRY & THE HELICOPTER ROLLED OVER. NO FEEDBACK OR RESTRICTION OF THE CONTROLS WAS NOTED BEFORE IMPACT. A POST-ACDNT EXAM OF THE HELICOPTER DID NOT REVEAL ANY PREIMPACT PART FAILURE OR MALFUNCTION.

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

THE PILOT'S FAILURE TO RECOGNIZE AND CORRECT A SITUATION INVOLVING LOSS OF TAIL ROTOR EFFECTIVENESS, RESULTING IN LOSS OF AIRCRAFT CONTROL.

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