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NTSB Report
March 3, 1986 · Bell B-214-B-1 · N114RM
Bullard, GA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
March 3, 1986
Injury Outcomes
1 injury (1 minor injury)
Location
Bullard, GA
Aircraft
Bell B-214-B-1
Tail Number
N114RM
Operator
Rocky Mountain Helicopters
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ATL86FA084
A HELICOPTER INVOLVED IN A LOGGING OPERATION WAS IN PROCESS OF LIFTING A LOG WHEN CREW REPORTED A 'LOUD EXPLOSION' AND A LOSS OF POWER WAS EXPERIENCED. AN AUTOROTATIVE LANDING WAS ACCOMPLISHED AND A SMALL ENGINE FIRE WAS EXTINGUISHED. THE 1ST STAGE TURBINE DISC HAD SEPARATED AND WAS UNCONTAINED. DEBRIS HAD DAMAGED THE MAIN ROTOR BLADES AND COWLING DURING ITS DEPARTURE FROM THE HELICOPTER. EVIDENCE OF A THREAD LURE WAS REPORTED ON THE MALE AND FEMALE THREADS FOR THE DISC BOLTS. THIS IS THE SECOND REPORTED IGT TURBINE DISC FAILURE ON THIS ENGINE, BOTH WERE BEING OPERATED BY THIS COMPANY AT THE TIME.
Full Narrative
A HELICOPTER INVOLVED IN A LOGGING OPERATION WAS IN PROCESS OF LIFTING A LOG WHEN CREW REPORTED A 'LOUD EXPLOSION' AND A LOSS OF POWER WAS EXPERIENCED. AN AUTOROTATIVE LANDING WAS ACCOMPLISHED AND A SMALL ENGINE FIRE WAS EXTINGUISHED. THE 1ST STAGE TURBINE DISC HAD SEPARATED AND WAS UNCONTAINED. DEBRIS HAD DAMAGED THE MAIN ROTOR BLADES AND COWLING DURING ITS DEPARTURE FROM THE HELICOPTER. EVIDENCE OF A THREAD LURE WAS REPORTED ON THE MALE AND FEMALE THREADS FOR THE DISC BOLTS. THIS IS THE SECOND REPORTED IGT TURBINE DISC FAILURE ON THIS ENGINE, BOTH WERE BEING OPERATED BY THIS COMPANY AT THE TIME.
Flight
Event TypeAccident
Event Time10:22 EST
Nearest Airport10nm SE
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionIflt
Aircraft
AircraftBell B-214-B-1
Tail NumberN114RM
Aircraft CategoryHeli
DamageSubstantial
OperatorRocky Mountain Helicopters
Operating RulePart 133
Engines1
Engine TypeTurboshaft
Engine DetailsLycoming · T5508D · Turboshaft · 2250
Seats3
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 35 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind280° @ 11 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point63 F / 48
Altimeter29.00 inHg
Observation Time15:55
Weather SourceWFAC