ASN Wikibase Occurrence # 40794
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| Date: | Friday 25 September 1992 |
| Time: | 13:10 LT |
| Type: |  Hughes 269C |
| Owner/operator: | Helicopters, Inc. |
| Registration: | N9609F |
| MSN: | 700017 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 11072 hours |
| Engine model: | Lycoming HIO-360D1A |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | East Bernstadt , KY -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Winchester, KY |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER WAS ON A LOW ALTITUDE POWERLINE PATROL WHEN IT DESCENDED AND COLLIDED WITH UPSLOPING TERRAIN. THE INVESTIGATION REVEALED THE CLUTCH SPRING ASSEMBLY WAS FRACTURED, INVOLVING THE ASSEMBLY RETAINER END WHICH SEPARATED. THE RETAINER WALL WAS SEVERELY WORN WHERE THE SEPARATION OCCURRED. THE ASSEMBLY FUNCTIONS TO ENGAGE THE BELT DRIVE SYSTEM WHICH IN TURNS TRANSMITS ENGINE POWER TO THE MAIN TRANSMISSION. THE HELICOPTER HAD OVER 11,000 HOUR OF TOTAL TIME. THE LAST INSPECTION OF THE ASSEMBLY WAS ABOUT A MONTH EARLIER, DURING A 100 HOUR INSPECTION. A REVIEW OF MAINTENANCE RECORDS REVEALED NO PREVIOUS REPLACEMENT OF THE ASSEMBLY.
Probable Cause: INADEQUATE MAINTENANCE INSPECTION INVOLVING FAILURE TO DETECT WEAR OF THE CLUTCH SPRING ASSEMBLY, RESULTING IN THE UNCOUPLING OF ENGINE POWER TO THE MAIN TRANSMISSION.
Accident investigation:
 |
|
Sources:
NTSB BFO92FA144
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 17:41 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Source, Narrative, Category, Accident report] |
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