NTSB Identification: LAX87LA199.
The docket is stored on NTSB microfiche number 37199.
Accident occurred Wednesday, April 29, 1987 in TAMUNINGS, GU
Probable Cause Approval Date: 05/26/1989
Aircraft: HUGHES 369D, registration: N10995
Injuries: 2 Fatal.

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

A HUGHES 369D, OPERATED OFF OF A FISHING VESSEL, WENT OUT OF CONTROL AND CRASHED IN THE PACIFIC OCEAN, NR GUAM. THE ACCIDENT WAS WITNESSED BY THE SHIP'S CAPTAIN. HIS STATEMENT INDICATED ONE OF THE MAIN ROTOR BLADES SEPARATED IN FLT WHILE THE HELO WAS ORBITING THE SHIP AT APRX 200 FT MSL. DURING AN EARLIER FLT A VIBRATION ASSOCIATED WITH THE MAIN ROTOR SYSTEM WAS EXPERIENCED. THE DISCREPANCY WAS REFERRED TO THE A&P MECHANIC ON THE BOAT, WHO WORKED ON THE HELO FOR ABOUT ONE HOUR WITH THE PLT. THE HELO WAS THEN TEST FLOWN. THE MAIN ROTOR BLADES OF THE HUGHES 369D ARE ATTACHED TO THE MAIN ROTOR HUB WITH STAINLESS STEEL RETENTION STRAPS. THE MANUFACTURER OUTLINES A PROCEDURE DESIGNED TO HELP PREVENT MAIN ROTOR HUB COMPONENT CORROSION ON HELICOPTERS OPERATED IN MARINE ENVIRONMENTS. RECORDS MAINTAINED AT THE HELO MAINTENANCE BASED REVEALED THAT SUFFICIENT SUPPLIES WERE NOT AVAILABLE TO ACCOMPLISH THE PROCEDURE ON BOARD THE SHIP. THE ACFT WAS NOT RECOVERED.

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

ROTOR SYSTEM,MAIN ROTOR BLADE..SEPARATION


Contributing Factors

MAINTENANCE,SERVICE OF AIRCRAFT/EQUIPMENT..INADEQUATE..COMPANY MAINTENANCE PERSONNEL

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