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| Date: | Monday 17 September 1984 |
| Time: | 10:35 LT |
| Type: |  Aerospatiale SA 315B Lama |
| Owner/operator: | Hosking Helicopters, Inc. |
| Registration: | N49532 |
| MSN: | 2500 |
| Total airframe hrs: | 4165 hours |
| Engine model: | Turbomeca ARTOUSTE IIIB |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mountain View, WY -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER EXPERIENCED A LOSS OF POWER DURING AN EXTERNAL LOAD OPERATION. THE PLT RELEASED THE LOAD AND PERFORMED AN AUTOROTATION. A HARD LANDING RESULTED DURING WHICH THE TAIL BOOM WAS SEVERED BY THE MAIN ROTOR BLADES. METALLURGICAL EXAMINATION OF THE ENGINE COMPRESSOR SECTION REVEALED THE REAR 1/3 OF THE #3 COMPRESSOR BLADE SEPARATED FROM THE ASS'Y BY A TRANSVERSE FRACTURE THROUGH THE PLATFORM AND AIRFOIL. THE #5 ATTACHMENT PIN SEPARATED APRX 1/4 INCH FROM ITS AFT SURFACE. THE FRACTURE OCCURRED DUE TO A COMBINATION OF STRESS CORROSION CRACKING, FATIGUE PROGRESSION AND BENDING OVERSTRESS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB DEN84LA292
History of this aircraft
Other occurrences involving this aircraft
| 2 July 1982 | N49532 | Hosking Exploration Helicopter | 0 | Big Piney, WY | |
sub |
| 7 August 1983 | N49532 | Hosking Helicopters | 0 | Montpelier, ID | |
sub |
| 12 May 1991 | C-GLAY | Liftair International | 2 | 40 km from Geladin |  |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 31-Mar-2024 08:36 | ASN Update Bot | Added |
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