NTSB Identification: ATL86FA218.
The docket is stored on NTSB microfiche number 31827.
Accident occurred Monday, August 11, 1986 in LAURENS, SC
Aircraft: HUGHES 269C, registration: N7442F
Injuries: 1 Uninjured.

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.

THE PLT WAS FLYING AN UNDERGROUND CABLE PATROL AT 500-600 FT AGL WHEN THE ACCIDENT OCCURRED. THE PLT REPORTED PWR WAS SET AT 20' HG, 3,000 RPM WHEN A 'VERY LOUD POP' WAS HEARD. THE PLT LIKENED THE SOUND TO BEING HIT BY GROUND FIRE. THE ACFT YAWED AND THE ENG OVERSPED. AN AUTOROTATION WAS PERFORMED INTO AN ABANDONED MINING PIT. THE ACFT NOSED UP AND ROLLED OVER ON ITS RIGHT SIDE. THE PLT STATED THAT THE ENG WOULD RESPOND TO THROTTLE BUT THE MAIN ROTOR WOULD NOT FOLLOW PWR CHANGES. THE MAIN ROTOR TRANSMISSION TO HAVE A RING GEAR CARRIER FAILURE. AD 81-1704 AND RELATED SERVICE NOTICE CONCERNING THIS PART HAD NOT BEEN COMPLIED WITH.

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

ROTOR DRIVE SYSTEM,MAIN GEARBOX/TRANSMISSION..FATIGUE

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

MAINTENANCE,INSPECTION..INADEQUATE..COMPANY MAINTENANCE PERSONNEL

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

ROTOR DRIVE SYSTEM,MAIN GEARBOX/TRANSMISSION..SEPARATION

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

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

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

ROTOR DRIVE SYSTEM,MAIN GEARBOX/TRANSMISSION..LIFE EXPIRED

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

MAINTENANCE,SERVICE BULLETIN/LETTER..DISREGARDED..COMPANY MAINTENANCE PERSONNEL

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

MAINTENANCE,RECORDKEEPING..INACCURATE..OTHER MAINTENANCE PERSONNEL



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