ASN Wikibase Occurrence # 216212
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Date: | Friday 11 June 1999 |
Time: | 17:00 LT |
Type: | Robinson R44 |
Owner/operator: | Hwy 66 Aviation LLC |
Registration: | N49669 |
MSN: | 562 |
Year of manufacture: | 1998 |
Total airframe hrs: | 279 hours |
Engine model: | Lycoming O-540-F1B5 |
Fatalities: | Fatalities: 0 / Occupants: 3 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | near Sevierville, Seveir County, Tennessee -
United States of America
|
Phase: | En route |
Nature: | Unknown |
Departure airport: | Sevierville, TN |
Destination airport: | |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The pilot reported that about 10 minutes into his sightseeing flight, at 400 to 500 feet of altitude, in cruise flight, he heard a noise similar to a shotgun blast and experienced vibration, uncommanded yaw, and low rotor and engine rpm. He regained control and conducted a successful autorotation. Postcrash examination of the helicopter revealed drive train, framework, and fuel tank shrapnel damage originating from a failed transmission forward main driveshaft yoke. Examination of the failed yoke by the NTSB Materials Laboratory revealed a cracked weld that originated during manufacture.
Probable Cause: The induced fatigue fracture of a component in the engine-to-transmission rotor drive system resulting in a disconnection of the drive system during cruise flight caused by inadequate inspection processes by the manufacturer and the subsequent autorotative emergency descent and forced landing.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | MIA99LA181 |
Status: | Investigation completed |
Duration: | 1 year and 5 months |
Download report: | Final report |
|
Sources:
NTSB MIA99LA181
FAA register: 2. FAA:
https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=49669 Location
Revision history:
Date/time | Contributor | Updates |
12-Oct-2018 14:42 |
Dr.John Smith |
Added |
08-Apr-2024 05:33 |
ASN Update Bot |
Updated [Time, Cn, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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