NTSB Identification: FTW87FA096.
The docket is stored on NTSB microfiche number 33753.
Accident occurred Wednesday, April 15, 1987 in BEN WHEELER, TX
Probable Cause Approval Date: 05/02/1988
Aircraft: BELL 222, registration: N1074T
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.

ALL SIX LOWER STUDS ON DRIVE HUB ASSEMBLY FAILED DUE TO FATIQUE. THIS DISCONNECTED ALL CYCLIC AND COLLECTIVE CONTROLS. TAIL BOOM THEN SEPARATED DUE TO SEVERE VIBRATIONS. HELICOPTER THEN COLLIDED WITH GROUND AND WAS DESTROYED BY POST CRASH FIRE. THE PLTS FLT TIME WAS NOT REPORTED OR AVAILABLE.

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

ROTOR DRIVE SYSTEM..FATIGUE

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

ROTOR DRIVE SYSTEM..FAILURE,TOTAL

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

ROTORCRAFT FLIGHT CONTROL..DISCONNECTED


Contributing Factors

MAINTENANCE,INSPECTION..INADEQUATE..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

ACFT/EQUIP,INADEQUATE AIRCRAFT COMPONENT..PRODUCTION/DESIGN PERSONNEL


Contributing Factors

AUTOROTATION..NOT POSSIBLE..PILOT IN COMMAND

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