ASN Wikibase Occurrence # 296590
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| Date: | Tuesday 24 September 2002 |
| Time: | 14:00 LT |
| Type: |  Hughes 269A |
| Owner/operator: | Iowa Western Community College |
| Registration: | N1040S |
| MSN: | 56-0534 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 10383 hours |
| Engine model: | Lycoming HIO-360-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Council Bluffs, Iowa -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Council Bluffs Municipal Airport, IA (CBF/KCBF) |
| Council Bluffs Municipal Airport, IA (CBF/KCBF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter landed hard despite cyclic being applied during an instructional flight in which a certified flight instructor (CFI) and a dual student, seeking a CFI certificate, were performing autorotations. Inspection of the wreckage revealed a fractured cyclic/mixture support attachment bracket. A major portion of the fracture surface contained a very dark discoloration. The discoloration was heavier on the forward side of the fracture, and there were portions of the fracture without discoloration on the aft side of the fracture. Prolonged ultrasonic cleaning in an acetone failed to remove significant amount of this discoloration. The discoloration covered more than 85 percent of the fracture surface. Examination of the fracture surface with a scanning electron microscope after cleaning revealed that the discolored areas had a rounded globular appearance, typical of casting porosity. Features typical of overstress separation were noted in areas without discoloration. The broken arm also contained a secondary crack that extended aft from near the forward edge.
Probable Cause: The premature fracture of the cyclic/mixture bracket resulting in the inability to conduct a landing flare.
Accident investigation:
 |
|
Sources:
NTSB CHI02LA293
History of this aircraft
Other occurrences involving this aircraft
| 27 April 1997 | N1040S | Iowa Western Comm College | 0 | Council Bluffs, IA | |
sub |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Oct-2022 08:23 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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