ASN Wikibase Occurrence # 381571
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| Date: | Thursday 30 June 1983 |
| Time: | 09:40 LT |
| Type: |  Bell 47G-3B-1 SOLOY |
| Owner/operator: | Bear Tooth Helicopters |
| Registration: | N1334X |
| MSN: | 6555 |
| Year of manufacture: | 1965 |
| Engine model: | Allison 250-C20 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Townsend, MT -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | E. Of Townsend, MT |
| Townsend, MT | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER MADE A HARD TOUCHDOWN DURING AN AUTOROTATIVE FORCED LANDING AFTER THE ENGINE QUIT. DURING THE LANDING THEMAIN ROTOR SEVERED THE TAIL BOOM. THE PILOT STRETCHED THE AUTOROTATIONAL GLIDE TO REACH A HAY FIELD AND LOST MAIN ROTOR RPM IN THE PROCESS. THE ENGINE DIED OF FUEL STARVATION BECAUSE OF A LOW FUEL STATE AND BECAUSE THE PILOT WAS DESCENDING AT HIGH SPEED WITH NOSE LOW. IN THIS ACFT ACCORDING TO A TEST PILOT WHO SPECIALIZES IN THIS MODEL CAUTION MUST BE USED TO AVOID UNUSUAL PITCH ATTITUDES WITH A LOW FUEL STATE. THE PILOT SAID HE HAD A 30 DEGREE NOSE LOW ATTITUDE. THE FUEL TANKS ARE SLANTED 10 DEGREES AFT TO COMPENSATE FOR A 7 DEGREE NOSE LOW ATTITUDE IN NORMAL HIGH SPEED (80 MPH) CRUISE. THE PILOT SAID THE GAUGES SHOWED ABOUT 10 GALLONS JUST BEFORE THE ENGINE QUIT. HE ALSO STATED THAT HE FELT STARVATION OCCURRED.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB DEN83LA154
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Apr-2024 04:50 | ASN Update Bot | Added |
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