ASN Wikibase Occurrence # 361246
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| Date: | Friday 24 September 1993 |
| Time: | 10:50 LT |
| Type: |  Bell UH-1B |
| Owner/operator: | Northwest Helicopters, Inc |
| Registration: | N70NW |
| MSN: | 60-3568 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 4465 hours |
| Engine model: | LYCOMING T53-L-11D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Detroit Lake, OR -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRCRAFT STRUCK TREES WHILE ATTEMPTING AN AUTOROTATION AFTER AN ENGINE FAILURE. THE PILOT HAD PUNCHED OFF HIS EXTERNAL LOAD AFTER THE POWER LOSS, BUT WAS UNABLE TO SUCCESSFULLY ACCOMPLISH THE AUTOROTATION DUE TO INSUFFICIENT ALTITUDE AND UNSUITABLE TERRAIN. THE ENGINE FAILURE WAS THE RESULT OF THE FATIGUE FRACTURE OF BLADE NUMBER 19 OF THE SECOND STAGE TURBINE ROTOR ASSEMBLY.
Probable Cause: FAILURE OF A SECOND STAGE TURBINE WHEEL TOO LOW FOR A SUCCESSFUL AUTOROTATION. FACTORS INCLUDE A TREE IN THE APPROACH PATH.
Accident investigation:
 |
|
Sources:
NTSB SEA93LA213
History of this aircraft
Other occurrences involving this aircraft
| 8 August 2013 | N70NW | Northern Pioneer Helicopters Llc | 0 | Tok Junction Airport, AK | |
sub |
| Bounced on landing | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 16:23 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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