NTSB investigation record

SEA91LA077

Completed

Bell Bh-47G2A· N38926

Date: March 31, 1991
Location: Waitsburg, WA
Conditions: VMC
Record: Completed

Primary finding

Probable cause

The improper installation of the main rotor mast nut and lock washer by maintenance personnel which resulted in the separation of the main rotor system.

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