ASN Wikibase Occurrence # 30079
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| Date: | Tuesday 25 July 2000 |
| Time: | 12:15 |
| Type: |  Schweizer 269C (300C) |
| Owner/operator: | Skylane Helicopters Llc |
| Registration: | N298SH |
| MSN: | S-1761 |
| Total airframe hrs: | 758 hours |
| Engine model: | Lycoming HIO-360-D1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sherman Municipal Airport, 1 nm SE of Sherman, Grayson County, Texas -
 United States of America
|
| Phase: | Approach |
| Nature: | Executive |
| Departure airport: | SWI |
| Investigating agency: | NTSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
According to the pilot, the helicopter was on final approach at 20 feet agl and 40 knots when it 'abruptly yawed left.' The pilot noted that the engine RPM 'pegged off the dial.' The pilot lowered the collective and rolled the throttle to idle. Approximately 5 feet agl, the pilot increased the collective and applied 'slight' aft cyclic. The helicopter impacted the ground on the rear section of the right skid, bounced, and rolled over onto its left side. Examination of the helicopter at the accident site revealed that the clutch cable had separated. The clutch cable was examined and found to have failed as a result of high-cycle fatigue crack propagation on the individual wires. The initiation of the fatigue cracks correlated to an area of contact between the wires; however, there was no evidence of manufacturing or material defects in the cable assembly that could be associated with the failure. Examination of the failed cable revealed that it may have been difficult to notice the failing clutch cable wires without disassembly. According to the helicopter's maintenance manual , disassembly and inspection of the clutch cable and clutch assembly is to be completed every 400 hours. At the time of the accident, the helicopter had accumulated a total of 757.5 flight hours and 398.9 hours since the last 400-hour inspection.
Probable Cause: the total failure of the clutch cable during landing, which resulted from fatigue cracking of the cable's individual wires.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X21471&key=1
FAA register: 2. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=298SH
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 15-Feb-2015 14:28 | Dr. John Smith | Updated [Time, Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 21-Dec-2016 19:16 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 21-Dec-2016 19:20 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 12-Dec-2017 18:59 | ASN Update Bot | Updated [Cn, Operator, Total occupants, Nature, Departure airport, Destination airport, Source, Narrative] |
| 20-Sep-2019 15:20 | BEAVERSPOTTER | Updated [Cn, Source, Damage] |
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