Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain McDonnell Douglas Model DC-10-10, -15, -30, and -40 series airplanes, and Model KC-10A (military) airplanes. This proposal would require inspection(s) to detect cracks of the attach bolts of the front spar support fitting of each wing. This proposal would also require replacement of attach bolts of the front spar support fitting of the wing with corrosion-resistant attach bolts. This proposal is prompted by a report of failure of the attach bolts of the front spar fitting as a result of corrosion pitting. The actions specified by the proposed AD are intended to prevent such stress corrosion failure, which could lead to the failure of the attach bolts of the front spar; this situation could result in reduced structural integrity of the wing.