NTSB Identification: ATL87FA009.
The docket is stored on NTSB microfiche number 32617.
Accident occurred Monday, October 20, 1986 in NASHVILLE, TN
Aircraft: BELL 206B III, registration: N2204Z
Injuries: 1 Minor,2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

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.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

MAINTENANCE,INSTALLATION..IMPROPER..OTHER PERSON




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