NTSB Identification: CHI87FA139.
The docket is stored on NTSB microfiche number 35638.
Accident occurred Wednesday, June 03, 1987 in DAYTON, MN
Probable Cause Approval Date: 02/24/1989
Aircraft: BELL 47G, registration: N128B
Injuries: 2 Fatal.

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.

AIRCRAFT COLLIDED WITH TERRAIN AFTER TAILBOOM STRUCTURE FAILED BECAUSE OF INTERNAL CORROSION. THE AIRCRAFT WAS NOT REGISTERED AT THE TIME OF THE ACCIDENT AND THE PILOT/OPERATOR FAILED TO ASSURE THAT PROPER OR TIMELY PREVENTIVE MAINTENANCE WAS PERFORMED ON THE AIRCRAFT.

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

MISC ROTORCRAFT,TAIL BOOM..CORRODED

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

MAINTENANCE..NOT PERFORMED..COMPANY/OPERATOR MANAGEMENT

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