NTSB Identification: CHI92DEX03.
The docket is stored on NTSB microfiche number 47718.
Accident occurred Friday, July 17, 1992 in DECKER, IN
Probable Cause Approval Date: 07/26/1993
Aircraft: PIPER PA-25-260, registration: N4766Y
Injuries: 1 Fatal.

PILOT STARTED PULL UP FOR REVERSAL TURN IN AERIAL APPLICATION MANEUVER. THE RIGHT WING SEPARATED FROM THE AIRPLANE. AIRPLANE CRASHED IN FIELD AND WAS CONSUMED BY POST CRASH FIRE. METALLURGICAL EXAMINATION REVEALED PREEXISTING FATIGUE CRACKS IN LOWER SPAR CAP OF THE RIGHT WING ORIGINATING FROM TWO MISDRILLED HOLES. AIRWORTHINESS DIRECTIVE TO INSPECT FOR WING SPAR FATIGUE CRACKS HAD NOT BEEN COMPLIED WITH.

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

FAILURE OF THE RIGHT WING SPAR, IMPROPER MAINTENANCE/MODIFICATION, AND FAILURE TO COMPLY WITH AN AIRWORTHINESS DIRECTIVE.

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