ASN Wikibase Occurrence # 294298
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Date: | Thursday 9 December 2004 |
Time: | 16:15 LT |
Type: | Hughes 369D |
Owner/operator: | Aerial Solutions Inc. |
Registration: | N7148Z |
MSN: | 570136D |
Year of manufacture: | 1977 |
Total airframe hrs: | 19906 hours |
Engine model: | Allison 250-C20B |
Fatalities: | Fatalities: 0 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Zachary, Louisiana -
United States of America
|
Phase: | Unknown |
Nature: | Unknown |
Departure airport: | Zachary, LA |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:While performing aerial side-trimming of trees and bushes for a pipeline right-of -way using an external saw at an altitude of about 200 feet, the 14,000-hour pilot experienced a left yaw and what he perceived to be an engine failure. The pilot released the external load as he attempted an autorotation from an out-of-ground effect hover at 200 feet agl. Crushing damage to the airframe was consistent with a ground impact at a high rate of descent. A detailed examinations of the engine confirmed the reported loss of engine power. The engine examination revealed the Rolls-Royce manufactured compressor adapter coupling, which had been installed approximately 414 hours earlier, had disconnected the compressor assembly from the turbine assembly as a result of fatigue cracking initiated by fretting on the pilot diameter.
Probable Cause: The loss of engine power as a result of fatigue cracking of the compressor adaptor coupling initiated by fretting on the pilot diameter and subsequent disconnection of the compressor from the turbine assembly. A contributing factor was the low operating altitude of the helicopter, which made a successful autorotation by the pilot imposible.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | DFW05FA032 |
Status: | Investigation completed |
Duration: | 10 months |
Download report: | Final report |
|
Sources:
NTSB DFW05FA032
Revision history:
Date/time | Contributor | Updates |
11-Oct-2022 14:56 |
ASN Update Bot |
Added |
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