ASN Wikibase Occurrence # 35462
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Date: | Wednesday 6 May 1992 |
Time: | 16:30 |
Type: | Robinson R22 Beta |
Owner/operator: | Kansas Copter & Wings Inc |
Registration: | N191KC |
MSN: | 1818 |
Year of manufacture: | 1991 |
Total airframe hrs: | 469 hours |
Fatalities: | Fatalities: 2 / Occupants: 2 |
Aircraft damage: | Destroyed |
Category: | Accident |
Location: | 3 miles south of Mount Pleasant,Tennessee -
United States of America
|
Phase: | En route |
Nature: | Private |
Departure airport: | Jackson, Tennessee (MKL/KMKL) |
Destination airport: | Raleigh, North Carolina (RDU/KRDU) |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:On May 6, 1992, at 16:30 CDT (Central Daylight Time) N191KC, a Robinson R22 helicopter owned by Kansas Copter and Wings, broke up in flight about 3 miles south of Mount Pleasant,Tennessee. Witnesses reported hearing a loud bang, and shortly afterwards, the helicopter came to rest in a pasture.
The pilot had notified Jackson Automated Flight Service Station that he planned to depart Jackson, Tennessee, under VFR en route to Tullahoma, Tennessee, and that he intended to fly at 3,000 feet above mean sea level (amsl). The pilot then obtained a pre-flight weather briefing. Visual meteorological conditions prevailed at the time of the accident. Winds near the accident site were reported between 7 and 15 knots, gusting to 20 knots. The pilot had
accumulated 116 total flight hours, 57 of which were in the R22.
The helicopter wreckage was scattered over an area 1,500 feet long and 100 feet wide. Sections of the left door frame were recovered from a field 1,100 feet southwest of the main wreckage. Examination of the left door frame revealed paint transfer and rotor blade leading edge indentations. Examination of the wreckage revealed the main rotor shaft exhibited about a 25 degree bend directly below the main rotor hub, corresponding with the full downward teetering of the main rotor hub.
Both spindle tusks were sheared, and indentations and chipped primer on either end of the hub were observed in positions corresponding to the spindles, and consistent with the rotor blades traveling beyond their design limits in the up and down direction (flapping).
No evidence could be found of main rotor coning. The pitch change links remained attached to the upper swash plate assembly and exhibited bending overload separations at the upper rod end bearings. The examination of the main rotor blades revealed blue paint transfer on one of the blades upper surface and leading edge from 43 to 46 inches from the tip of the blade.
The left door frame, left cyclic hand grip, and left side of the lower fuselage at the aft bulkhead exhibited damage consistent with a strike from the main rotor blade and consistent with the abrasion found on the blade's leading edge. In addition, the left skid cross tube (located directly below the damaged left door frame and bulkhead) exhibited damage consistent with a strike from the main rotor blade. The examination of the cyclic and collective control system revealed no evidence of fatigue or a pre-impact failure.
The NTSB could find no evidence of the specific event that caused or allowed the main rotor blades to diverge from their normal flight path plane and strike the airframe. The NTSB determined that the probable cause of this accident was a divergence of the main rotor from its normal plane of rotation for an undermined reason, which resulted in main rotor blade contact to the cockpit area.
Sources:
1. NTSB Identification: ATL92FA096 at
https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001211X14555&key=1&queryId=130d12ae-1197-47b1-8963-193eb14db3c9&pgno=3&pgsize=100 2. FAA:
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=191KC 3.
http://www.griffin-helicopters.co.uk/accidentdetails.aspx?accidentkey=37039 4.
http://planecrashmap.com/plane/tn/N191KC/ Revision history:
Date/time | Contributor | Updates |
24-Oct-2008 10:30 |
ASN archive |
Added |
25-May-2016 14:23 |
Dr.John Smith |
Updated [Time, Location, Source, Narrative] |
20-Sep-2016 19:17 |
Dr.John Smith |
Updated [Departure airport, Destination airport, Source, Narrative] |
20-Sep-2016 19:18 |
Dr.John Smith |
Updated [Operator] |
21-Dec-2016 19:22 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
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