ASN Wikibase Occurrence # 309985
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| Date: | Wednesday 11 December 2013 |
| Time: | 10:08 LT |
| Type: |  Beechcraft E90 King Air |
| Owner/operator: | Bemidji Aviation Services Inc |
| Registration: | N60BA |
| MSN: | LW-79 |
| Year of manufacture: | 1993 |
| Total airframe hrs: | 9283 hours |
| Engine model: | Pratt & Whitney Canada PT6A-28 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Eau Claire, WI -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Park Rapids Municipal Konshok Field, MN (KPKD) |
| Chicago-Executive Airport, IL (PWK/KPWK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The operator reported that, while in cruise flight at flight level 190, the copilot's inner layer windshield cracked. Windshield heat was not being used at the time, and pressurization was not compromised. The pilot conducted a precautionary landing without incident. Examinations of the windshield revealed that the inner glass ply had fractured due to a peel adhesion chip at the windshield's lower forward corner. The peel chip developed as a result of the differences in coefficient of expansion between the inboard glass ply and vinyl interlayer and had propagated due to mechanical and thermal expansion stresses until the center tension of the thermally tempered glass was penetrated, which caused a spontaneous fracture. The windshield was redesigned in 2001 to reduce the thermal expansion stresses.
Probable Cause: The failure of the copilot's windshield inner layer due to a peel chip that developed as a result of mechanical and thermal expansion stresses.
Accident investigation:
 |
|
Sources:
NTSB CEN14IA085
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Apr-2023 15:58 | ASN Update Bot | Added |
| 04-Jun-2023 06:45 | Ron Averes | Updated |
Corrections or additions? ... Edit this accident description
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