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NTSB Report
April 29, 1987 · Hughes 369D · N10995
Tamunings
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 29, 1987
Injury Outcomes
2 injuries (2 fatalities)
Location
Tamunings
Aircraft
Hughes 369D
Tail Number
N10995
Operator
Adriatic Sea
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
LAX87LA199
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.
Full Narrative
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.
Flight
Event TypeAccident
Event Time18:39 UTC
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369D
Tail NumberN10995
Aircraft CategoryHeli
DamageDestroyed
OperatorAdriatic Sea
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 375
Seats4
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 44 · Unknown
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourceWIT