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ASN Wikibase Occurrence # 159536
Last updated: 17 August 2021
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Date:28-AUG-2013
Time:10:30
Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell 206L-1 LongRanger II
Owner/operator:Airlift Helicopters Inc.
Registration: N2018R
MSN: 45681
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)
Destination airport:Flagstaff, AZ (FLG)
Investigating agency: NTSB
Narrative:
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.

Sources:

NTSB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
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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