ASN Wikibase Occurrence # 42733
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| Date: | Sunday 2 May 1993 |
| Time: | 13:50 LT |
| Type: |  Bell 204B |
| Owner/operator: | Chester C. Rasberry |
| Registration: | N204AQ |
| MSN: | 2198 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 19420 hours |
| Engine model: | Lycoming T-53 |
| Fatalities: | Fatalities: 1 / Occupants: 2 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Copper Harbor, AK -
 United States of America
|
| Phase: | Taxi |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AEROLOGGING OPERATION REQUIRED A STEEP DESCENT FLIGHT PATH FROM THE LOG PICKUP SITE AT 1200 FT ELEVATION TO THE LANDING SITE AT 70 FT ELEVATION. DESCENT ESTIMATED TO TAKE 11-12 SECS, AND DESCRIBED AS 'STRAIGHT DOWN IN AUTOROTATION AND DROPPING THE LOGS.' PILOT EXPRESSED RESERVATIONS ABOUT 'BEING ABLE TO DO IT.' FOLLOWING A DESCENT, AND WHILE IN A HOVER, THE TAIL ROTOR & 90 DEG GEAR BOX SEPARATED. METALLURGICAL EXAM REVEALED FATIGUE SIGNATURES ON GEAR BOX CASE STUDS. GEAR BOX OF MILITARY ORIGIN. RECORDED WEIGHTS INDICATED THAT THE AIRCRAFT HAD BEEN OPERATING IN EXCESS OF THE GROSS WEIGHT HOOK LIMIT. THERE WAS NO RECORD OF SURVEILLANCE BY THE POI OR PMI FROM THE FAA OFFICE HOLDING THE OPERATOR'S CERTIFICATE.
Probable Cause: FATIGUE FAILURE OF THE TAIL ROTOR GEARBOX, AND IMPROPER HELICOPTER OPERATIONS BEING CONDUCTED BY THE OPERATOR RESULTING IN REPETITIVE AT AND OVER MAXIMUM LOADS. FACTORS IN THE ACCIDENT WERE: MATERIAL DEFECT OF THE TAIL ROTOR GEAR BOX (INADEQUATE QUALITY CONTROL) BY THE COMPANY/OPERATOR, AND INADEQUATE SURVEILLANCE OF BOTH THE COMPANY OPERATIONS AND MAINTENANCE FACILITY BY THE FAA.
Accident investigation:
 |
|
Sources:
NTSB ANC93FA056
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 14:21 | ASN Update Bot | Updated [Time, Operator, Total occupants, Other fatalities, Phase, Nature, Source, Narrative, Category, Accident report] |
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