ASN Wikibase Occurrence # 159536
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| Date: | Wednesday 28 August 2013 |
| Time: | 10:30 |
| Type: |  Bell 206L-1 LongRanger II |
| Owner/operator: | Airlift Helicopters Inc. |
| Registration: | N2018R |
| MSN: | 45681 |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 18462 hours |
| Engine model: | Alllison 250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | 20 miles west of Payson, Tonto National Forest, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Scottsdale, AZ (SDL) |
| Flagstaff, AZ (FLG) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the engine lost power while the helicopter was in cruise flight about 1,500 ft above ground level. He subsequently entered an autorotation and performed an emergency off-airport landing. During the descent, he maneuvered the helicopter to avoid obstacles; the helicopter subsequently landed hard, and the tailboom separated.
Examination of the engine revealed that the outer portion of the engine’s first-stage turbine blades and three vanes from the first-stage nozzle were thermally damaged. The turbine blades’ microstructure exhibited signatures consistent with an engine overtemperature event; however, it could not be determined when the overtemperature damage occurred. The postaccident examination of the airframe and engine revealed no additional evidence of a mechanical malfunction that would have precluded normal operation.
Weight and balance calculations revealed that, when the helicopter departed, it was over its allowable gross takeoff weight but that it was under its allowable gross operational weight at the time of the engine power loss.
Probable Cause: A partial loss of engine power due to an overtemperature event that thermally damaged the turbine blades and vanes, which resulted in a hard landing.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Aug-2013 11:30 | gerard57 | Added |
| 30-Aug-2013 05:33 | Geno | Updated [Time, Aircraft type, Cn, Operator, Location, Departure airport, Destination airport, Source] |
| 23-Sep-2016 18:44 | Aerossurance | Updated [Time, Operator, Location, Nature, Source, Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 18-Aug-2017 17:54 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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