NTSB Identification: LAX84LA494.
The docket is stored on NTSB microfiche number 26264.
Accident occurred Tuesday, September 25, 1984 in YUMA, AZ
Aircraft: HILLER UH12ET, registration: N9278Z
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT STATED THAT HE WAS CARRYING A LOAD OF PESTICIDE FOR APPLICATION ON A BROCCOLI FIELD. THE AIRCRAFT WAS IN LEVEL FLIGHT, APPROXIMATELY 4 TO 8 FEET AGL WHEN IT BECAME UNCONTROLLABLE AND IMPACTED THE GROUND. THE AIRCRAFT WAS CONSUMED BY A POST CRASH FIRE. EXAMINATION OF THE AIRCRAFT AFTER THE ACCIDENT REVEALED THAT ONE OF THE TWO MAIN ROTOR BLADES HAD SEPARATED IN-FLIGHT. EXAMINATION OF THE SEPARATED ROTOR BLADE REVEALED A FATIGUE TYPE FRACTURE OF THE MAIN ROTOR BLADE SPAR TUBE THROUGH THE OUTBOARD RETENTION BOLT HOLES. THE FAILED MAIN ROTOR BLADE SPAR BORE EVIDENCE OF CORROSION. THE MAIN ROTOR BLADE CUFF WAS THE SUBJECT OF AN AIRWORTHINESS DIRECTIVE THAT ACCORDING TO THE AIRCRAFT LOGBOOKS HAD BEEN COMPLIED WITH AS REQUIRED. THE LAST THREE LOGBOOK NOTATIONS, DOCUMENTING COMPLIANCE WITH THE AD, WERE ENTERED AFTER THE ACCIDENT.

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

MAINTENANCE,COMPLIANCE WITH AD..NOT PERFORMED..COMPANY MAINTENANCE PERSONNEL

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

ROTOR SYSTEM,MAIN ROTOR BLADE SPAR..CORRODED

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

ROTOR SYSTEM,MAIN ROTOR BLADE SPAR..FAILURE,TOTAL



Contributing Factors

MAINTENANCE,RECORDKEEPING..IMPROPER..COMPANY MAINTENANCE PERSONNEL

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