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NTSB Report
October 20, 1986 · Bell 206B III · N2204Z
Nashville, TN
Overview
Report Status
Preliminary report
Event Type
Accident
Date
October 20, 1986
Injury Outcomes
1 injury (1 minor injury), 2 uninjured
Location
Nashville, TN
Aircraft
Bell 206B III
Tail Number
N2204Z
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ATL87FA009
THE PLT WAS IN A DESCENT TOWARD A BUILDING IN A DOWNTOWN AREA WHICH HE WANTED AERIAL PHOTOGRAPHS OF. AT ABOUT 1700 FT AGL HE REPORTED THE HELICOPTER JERKED HARD AND YAWED TO THE LEFT. HE INITIATED AN AUTOROTATION AND DURING THE DESCENT TO THE SELECTED LANDING SITE HE HAD TO BLEED OFF ROTOR RPM TO CLEAR WIRES ACROSS THE APCH PATH. A HARD LANDING RESULTED IN A STREET INTERSECTION. POST ACCIDENT INSPECTION REVEALED THE SPUR ADAPTER GEARSHAFT FORWARD SPLINES WERE SEVERELY WORN. THE FORWARD END OF THE GEARSHAFT WAS FRACTURED. THE FRACTURE HAD ORIGINATED FROM THE SHAFT SPLINE TEETH. THE OIL DELIVERY TUBE FOR THE FORWARD SPLINE LUBRICATION DID NOT MEET REQUIREMENTS ESTABLISHED BY THE ENGINE MANUFACTURER.
Full Narrative
THE PLT WAS IN A DESCENT TOWARD A BUILDING IN A DOWNTOWN AREA WHICH HE WANTED AERIAL PHOTOGRAPHS OF. AT ABOUT 1700 FT AGL HE REPORTED THE HELICOPTER JERKED HARD AND YAWED TO THE LEFT. HE INITIATED AN AUTOROTATION AND DURING THE DESCENT TO THE SELECTED LANDING SITE HE HAD TO BLEED OFF ROTOR RPM TO CLEAR WIRES ACROSS THE APCH PATH. A HARD LANDING RESULTED IN A STREET INTERSECTION. POST ACCIDENT INSPECTION REVEALED THE SPUR ADAPTER GEARSHAFT FORWARD SPLINES WERE SEVERELY WORN. THE FORWARD END OF THE GEARSHAFT WAS FRACTURED. THE FRACTURE HAD ORIGINATED FROM THE SHAFT SPLINE TEETH. THE OIL DELIVERY TUBE FOR THE FORWARD SPLINE LUBRICATION DID NOT MEET REQUIREMENTS ESTABLISHED BY THE ENGINE MANUFACTURER.
Flight
Event TypeAccident
Event Time10:00 CDT
Nearest AirportNashville Metropolitan (5nm W)
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell 206B III
Tail NumberN2204Z
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C20B · Turboshaft · 420
Seats5
People & Injuries
Injury Summary1 injury (1 minor injury), 2 uninjured
Fatal0
Serious0
Minor1
Uninjured2
Total3
Crew 1Age 29 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind110° @ 3 kt
Visibility5 sm
CeilingNone
Temperature / Dew Point61 F / 52
Altimeter30.00 inHg
Observation Time15:50
Weather SourceWFAC