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NTSB Report
May 5, 1991 · Hughes 369HS · N9219F
Keanae, HI
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 5, 1991
Injury Outcomes
3 injuries (3 minor injuries), 2 uninjured
Location
Keanae, HI
Aircraft
Hughes 369HS
Tail Number
N9219F
Operator
Gerardin
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX91LA198
DURING AN AIR TAXI SIGHTSEEING FLIGHT THE PILOT EXPERIENCED A SUDDEN TOTAL LOSS OF ALL ENGINE POWER. THE PILOT MADE A FORCED LANDING AND COLLIDED WITH TREES. EXAM OF THE HELICOPTER'S ENGINE REVEALED THE FORWARD SPLINES ON THE SPUR ADAPTER GEARSHAFT HAD FAILED IN FATIGUE WHICH RESULTED IN THE SAG BEING DISCONNECTED FORM THE DRIVE SYSTEM. METALLURGICAL EXAM OF THE FAILED SAG REVEALED IT CONFORMED TO ITS MANUFACTURER'S DESIGN SPECIFICATIONS. THE COMPRESSOR, AND THE SAG, WERE SUBJECT TO AN OVERHAUL 826.8 OPERATIONAL HOURS PRIOR TO THE ACCIDENT.
NTSB Probable Cause
THE TOTAL FAILURE IN FATIGUE OF THE HELICOPTER'S SPUR ADAPTER GEARSHAFT. A CONTRIBUTING FACTOR WAS RELATED TO THE LACK OF A SUITABLE EMERGENCY LANDING SITE.
Full Narrative
DURING AN AIR TAXI SIGHTSEEING FLIGHT THE PILOT EXPERIENCED A SUDDEN TOTAL LOSS OF ALL ENGINE POWER. THE PILOT MADE A FORCED LANDING AND COLLIDED WITH TREES. EXAM OF THE HELICOPTER'S ENGINE REVEALED THE FORWARD SPLINES ON THE SPUR ADAPTER GEARSHAFT HAD FAILED IN FATIGUE WHICH RESULTED IN THE SAG BEING DISCONNECTED FORM THE DRIVE SYSTEM. METALLURGICAL EXAM OF THE FAILED SAG REVEALED IT CONFORMED TO ITS MANUFACTURER'S DESIGN SPECIFICATIONS. THE COMPRESSOR, AND THE SAG, WERE SUBJECT TO AN OVERHAUL 826.8 OPERATIONAL HOURS PRIOR TO THE ACCIDENT.
Flight
Event TypeAccident
Event Time11:29 HST
Nearest Airport0nm
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHughes 369HS
Tail NumberN9219F
Aircraft CategoryHeli
DamageSubstantial
OperatorGerardin
Operating RulePart 135
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20 · Turboshaft · 400
Seats5
People & Injuries
Injury Summary3 injuries (3 minor injuries), 2 uninjured
Fatal0
Serious0
Minor3
Uninjured2
Total5
Crew 1Age 38 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind45° @ 10 kt, gusting 15 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO