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Fri, Feb 20, 2009

AD: Viking Air Limited

AD NUMBER: 2009-04-09
MANUFACTURER: Viking Air Limited
SUBJECT: Airworthiness Directive 2009-04-09
SUMMARY:
We are superseding an existing airworthiness directive (AD) for the products listed above.

This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product.

The MCAI describes the unsafe condition as: There have been reports of inter-rivet cracking on several wing front spar adapter assemblies (P/N C6WM1027-1) on the horizontal and vertical flanges. It was determined that the cracking was caused by stress corrosion in the short transverse grain initiated by local riveting induced stresses.

We are issuing this AD to require actions to correct the unsafe condition on these products.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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