ASN Wikibase Occurrence # 76837
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| Date: | Thursday 17 June 1993 |
| Time: | 19:00 LT |
| Type: |  Bell 206B-3 Jet Ranger III |
| Owner/operator: | Rocky Mountain Helicopters Inc |
| Registration: | N21424 |
| MSN: | 3466 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 9850 hours |
| Engine model: | ALLISON 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Annette Bay, near Ketchikan, Alaska -
 United States of America
|
| Phase: | Landing |
| Nature: | Executive |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER HAD BEEN INVOLVED IN A PREVIOUS TAIL ROTOR STRIKE AND THE DRIVESHAFT WAS INSPECTED. THE ADAPTER ON TAIL ROTOR DRIVE SHAFT NUMBER 4 DEBONDED AND ROTATED ON THE SHAFT. METALLURGICAL EXAMINATION SHOWED DEBONDING BUT THE MODE COULD NOT BE DETERMINED DUE TO ROTATIONAL DAMAGE. OTHER SHAFT ADAPTERS SHOWED DEBONDING AND WERE CAUSED BY PLASTIC BLASTING. THE INSPECTION PROCEDURE CALLS FOR INSPECTIONS ON THE SHAFT USING MAGNETIC PARTICLE OR FLUORESCENT PENETRANT METHODS AND DOES NOT CALL FOR PLASTIC MEDIUM BLASTING.
Probable Cause: THE FAILURE OF THE TAIL ROTOR DRIVE SHAFT COUPLING AND THE INADEQUATE INSPECTION OF THE TAIL ROTOR DRIVE SYSTEM BY COMPANY MAINTENANCE PERSONNEL AFTER THE FIRST TAIL ROTOR STRIKE.
Accident investigation:
 |
|
Sources:
NTSB ANC93LA095
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=21424
History of this aircraft
Other occurrences involving this aircraft
| 10 November 1992 | N21424 | Rmh Aerologging, Inc | 0 | Elf Point Camp, AK | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Sep-2010 14:30 | ASN Archive | |
| 28-Aug-2016 15:51 | Dr.John Smith | Updated [Date, Time, Aircraft type, Registration, Cn, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Destination airport, Source, Damage, Narrative] |
| 28-Aug-2016 15:55 | Dr.John Smith | Updated [Source] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 13-Jul-2018 12:28 | Anon. | Updated [Narrative, Photo, ] |
| 13-Jul-2018 12:29 | tkairshows | Updated [Narrative, Photo, ] |
| 10-Apr-2024 13:15 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Nature, Destination airport, Source, Narrative, Category, Accident report] |
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