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NTSB Report
June 1, 1988 · Continental Copters MK6B · N9080T
Callahan, FL
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 1, 1988
Injury Outcomes
No injuries (1 uninjured)
Location
Callahan, FL
Aircraft
Continental Copters MK6B
Tail Number
N9080T
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA88LA186
WHILE MANEUVERING THE HELICOPTER DURING AN AERIAL APPLICATION FLT THE ENG QUIT. DURING THE AUTOROTATIVE LANDING THE HELICOPTER LANDED HARD. EXAMINATION OF THE ENG REVEALED THE ACCESSORY DRIVE GEAR, WHICH IS ATTACHED TO THE CRANKSHAFT BY 6 AN-4A BOLTS WITH THE TORQUE TRANSMITTED TO THE GEAR THROUGH 3 PRESS-FIT DOWEL PINS, SEPARATED WHEN THE BOLTS FAILED DUE TO FATIGUE, RESULTING IN THE TOTAL LOSS OF ENG POWER. THERE WAS NO EVIDENCE THAT THE DOWEL PINS WERE INSTALLED. ACCORDING TO THE ENG MANUFACTURER, THE DOWEL PINS ARE THE PRINCIPAL TORQUE CARRYING MECHANISM OF THE ACCESSORY DRIVE GEAR.
Full Narrative
WHILE MANEUVERING THE HELICOPTER DURING AN AERIAL APPLICATION FLT THE ENG QUIT. DURING THE AUTOROTATIVE LANDING THE HELICOPTER LANDED HARD. EXAMINATION OF THE ENG REVEALED THE ACCESSORY DRIVE GEAR, WHICH IS ATTACHED TO THE CRANKSHAFT BY 6 AN-4A BOLTS WITH THE TORQUE TRANSMITTED TO THE GEAR THROUGH 3 PRESS-FIT DOWEL PINS, SEPARATED WHEN THE BOLTS FAILED DUE TO FATIGUE, RESULTING IN THE TOTAL LOSS OF ENG POWER. THERE WAS NO EVIDENCE THAT THE DOWEL PINS WERE INSTALLED. ACCORDING TO THE ENG MANUFACTURER, THE DOWEL PINS ARE THE PRINCIPAL TORQUE CARRYING MECHANISM OF THE ACCESSORY DRIVE GEAR.
Flight
Event TypeAccident
Event Time19:00 EDT
Nearest Airport0nm
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftContinental Copters MK6B
Tail NumberN9080T
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-B1A · Reciprocating · 265
Seats3
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 36 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind130° @ 5 kt
Visibility6 sm
CeilingNone
Temperature / Dew Point66 F
Altimeter29.00 inHg
Observation Time23:00
Weather SourceWFAC