ASN Wikibase Occurrence # 43437
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| Date: | Wednesday 26 June 1985 |
| Time: | 11:40 |
| Type: |  Aérospatiale AS 350D |
| Owner/operator: | Cia Machinery |
| Registration: | N148BH |
| MSN: | 1274 |
| Total airframe hrs: | 1256 hours |
| Engine model: | LYCOMING LTS-101-600A2 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Dallas, Texas -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Love Field, Dallas, Texas (DAL/KDAL) |
| Lancaster, Texas (LNC/KLNC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information is only available from news, social media or unofficial sources |
THE ENGINE TO TRANSMISSION SHORT SHAFT BECAME DISCONNECTED IN FLIGHT. THIS RESULTED IN COMPLETE LOSS OF POWER TO THE MAIN ROTOR ASSEMBLY. HOWEVER, THE TAIL ROTOR ASSEMBLY WAS STILL BEING POWERED BY THE ENGINE. UPON COLLECTIVE PITCH APPLICATION TO STOP THE DESCENT THE AIRCRAFT YAWED ABOUT 90 DEGREES TO THE RIGHT AND ALSO ROLLED ABOUT 70 DEGS TO THE RIGHT AND IMPACTED THE TRUNK OF A LARGE TREE. THIS IMPACT RESULTED IN DISINTEGRATION OF THE HELICOPTER.
INVESTIGATION REVEALED THAT COTTER PINS HAD NOT BEEN INSTALLED IN THE BOLTS WHICH CONNECT THE FORWARD END OF THE SHORT SHAFT TO THE FLEXIBLE COUPLING AT THE TRANSMISSION. IT ALSO REVEALED THAT A REQUIRED 30 HOUR RECURRING INSPECTION HAD NOT BEEN COMPLETED AND WAS 15.9 HRS OVERDUE. THE COMPLETION OF THIS REQUIRED INSPECTION WOULD HAVE REVEALED THAT THE COTTER PINS WERE MISSING.
Sources:
1. NTSB: http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20001214X36777&key=1
2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=148BH
3. http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=35534
4. http://planecrashmap.com/plane/tx/N148BH/
5. http://aircrashed.com/aircraft/aFTW85FA265.shtml
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 27-Jun-2014 22:59 | Dr. John Smith | Updated [Time, Location, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:24 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
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