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 |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
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:
 |
|
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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