NTSB Identification: FTW90DRD11.
The docket is stored on NTSB microfiche number 41741.
Accident occurred Tuesday, June 05, 1990 in HOUMA, LA
Probable Cause Approval Date: 10/02/1992
Aircraft: BELL 47G3-B, registration: N73241
Injuries: 2 Uninjured.

THE HELICOPTER WAS BEING LANDED NEAR AN ALLIGATOR'S NEST, NEAR A LAKE. THE PILOT SAID THAT THE HELICOPTER FAILED TO RESPOND TO COLLECTIVE PITCH INPUTS DURING THE LANDING. HE SAID HE THEN TRIED TO MAKE A SLIDE-ON-LANDING INTO THE WATER BUT THE REAR PORTION OF THE FIXED FLOTATION GEAR IMPACTED A LEVEE, AND THE HELICOPTER ROLLED OVER FORWARD, AND SETTLED UPSIDE DOWN IN THE LAKE. NO PRE-IMPACT PROBLEMS WERE FOUND WITH THE FLIGHT CONTROLS.

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

THE PILOT'S FAILURE TO MAINTAIN ROTOR RPM AND AN EXCESSIVE SINK RATE.

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