ASN Wikibase Occurrence # 41249
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| Date: | Monday 3 June 1996 |
| Time: | 14:55 LT |
| Type: | Cirrus VK30 |
| Owner/operator: | Alfred Y. Corey |
| Registration: | N7033G |
| MSN: | 117 |
| Total airframe hrs: | 65 hours |
| Engine model: | Continental IO-550 |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Lapeer, MI -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Private |
| Departure airport: | (D95) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
According to witnesses, the accident pilot reported on Unicom that his 'flap bracket had broken.' A pilot who was on the ground near the accident site reported that he observed a 'violent flutter' on the right wing. Examination of the right flap revealed the inboard flap push rod was fractured at the end cap. The push rod welds exhibited 'porosity and secondary cracking indicative of poor welding techniques.' The inboard cruise flap push rod 'exhibited a thumbnail crack, which may have indicated failure by high stress, low cycle fatigue.' The outboard cruise flap hinge was fractured. Examination revealed the hinge was constructed entirely of composite material. The kit manufacturers drawings specify an aluminum core for the hinge. Differential scanning calorimetric analysis of the composite cruise flap skin revealed the vinyl ester matrix material was 'not fully cured.'
Probable Cause: incomplete cure of the bonding material in the cruise flap, improper material in the cruise flap hinge, and improper welding of the cruise flap push rod end caps. Factors were delamination of the cruise flap, partial failure of the cruise flap hinge, and fatigue failure of the outboard cruise flap push rod.
Accident investigation:
 |
|
Sources:
NTSB CHI96FA185
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 06:39 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Phase, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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