ASN Wikibase Occurrence # 36272
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| Date: | Thursday 27 May 1993 |
| Time: | 07:26 LT |
| Type: |  Aérospatiale AS 350B |
| Owner/operator: | Rocky Mountain Helicopters |
| Registration: | N782LF |
| MSN: | 1487 |
| Year of manufacture: | 1987 |
| Total airframe hrs: | 6064 hours |
| Engine model: | TURBOMECA Arriel 1B |
| Fatalities: | Fatalities: 2 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Cameron, DeKalb County, Missouri -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Bethany, MO (NONE) |
| Kansas City, MO | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
LIFEFLIGHT HELICOPTER WAS EN ROUTE WITH PATIENT WHEN NURSE HEARD LOUD 'POP' FOLLOWED BY 'CLATTERING' & HORN ALARM. SOON THEREAFTER, HELICOPTER IMPACTED A FIELD ON SOUTHERLY HEADING ABOUT 70' SOUTH OF TALL TREES. GROUND SCARS & DEBRIS WERE LOCATED ALONG 150' BY 80' PATH. WITNESSES SAID WIND WAS STRONG/GUSTY FROM SOUTH. HELICOPTER WAS EQUIPPED WITH TURBOMECA ARRIEL 1B ENGINE WITH TU-76 MODIFICATION. IT HAD TOTAL FLIGHT TIME OF 2482 HOURS. RECOMMENDED TIME BETWEEN OVERHAUL WAS 2500 HOURS. INVESTIGATION REVEALED ENGINE LOST POWER DUE TO FAILURE OF LABYRINTH SEAL IN 2ND STAGE TURBINE NOZZLE GUIDE VANE. TUBOMECA PERSONNEL PROPOSED THAT UNDER THERMAL LOW CYCLE FATIGUE, A CRACK COULD INITIATE ON 2ND TURBINE NOZZLE GUIDE VANE HUB, WHICH COULD LEAD TO RUB BETWEEN INNER DIAMETER OF HUB & INNER TURBINE LABYRINTH LIPS. THERE WERE 7 ENGINE FAILURES OF SIMILAR NATURE, ALL RELATED TO TU-76 STANDARD NOZZLES. TURBOMECA SERVICE BULLETIN 292 72 0153 WAS ISSUED TO IMPROVE MECHANICAL STRENGTH OF INTERNAL ENVELOPE OF 2ND STAGE NOZZLE GUIDE VANE.
Probable Cause: THE LOSS OF ENGINE POWER DUE TO FAILURE OF THE SECOND STAGE TURBINE LABYRINTH SEAL. FACTORS RELATED TO THE ACCIDENT WERE: THE UNFAVORABLE WIND AND TALL TREES BORDERING THE EMERGENCY LANDING AREA.
Accident investigation:
 |
|
Sources:
NTSB CHI93FA182
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=782LF
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 02-Jul-2014 16:33 | Dr. John Smith | Updated [Time, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:22 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 10-Apr-2024 13:41 | ASN Update Bot | Updated [Time, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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