Airworthiness Directives; British Aerospace Model Viscount 744, 745D, and 810 Series Airplanes

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all British Aerospace Model Viscount 744, 745D, and 810 series airplanes. This proposal would require inspections to detect cracks in the chassis side bracing structure and in the chassis top strut support intercostals inside the wings, and replacement of discrepant parts with new parts. This proposal would also require inspection of the intercostals to determine the specification of the material, if necessary, and replacement of discrepant parts with new parts. This proposal is prompted by a report of cracking in the chassis top strut support intercostal in the side bracing structure inside the wing due to the effects of metal fatigue. The actions specified by the proposed AD are intended to prevent such fatigue-related cracking, which could lead to the failure of the chassis side bracing structure inside the wings and consequent reduced structural integrity of the chassis support structure.