# Airworthiness Directives; Boeing Model 757-200, 757-200CB, and 757-200PF Series Airplanes Equipped With Rolls Royce Model RB211 Engines
> **Rule** · Final rule; request for comments. · Published 2005-02-28 · Effective 2005-03-15 · 70 FR 9511
## Document
- **Document number:** 05-3558
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 9511
- **Publication date:** 2005-02-28
- **Effective date:** 2005-03-15
- **FAA docket:** Docket No. FAA-2005-20424
## Abstract

The FAA is superseding an existing airworthiness directive (AD) that applies to certain Boeing Model 757-200, 757-200CB, and 757- 200PF series airplanes. The existing AD currently requires repetitive detailed inspections to detect horizontal or vertical movement of the shims at the joint of the mid-bulkhead and the upper link fittings, and corrective action if necessary; or certain alternative actions that terminate the requirement for the repetitive inspections. This new AD continues to require those repetitive inspections; decreases the allowable tolerance for shim migration; and adds new repetitive detailed inspections for cracking of the entire mid-bulkhead, and repair if necessary. This new AD also adds additional airplanes to the applicability of the AD. This AD is prompted by reports of cracks in the mid-bulkhead lower vertical flange common to the lower chord and stiffener and reports of cracking at other locations on the mid- bulkhead. We are issuing this AD to detect and correct migration of shims at the joint of the mid-bulkhead and the upper link fittings and cracking of the mid-bulkhead, which could result in cracking of the strut and consequent loss of the strut and engine.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/02/28/05-3558/airworthiness-directives-boeing-model-757-200-757-200cb-and-757-200pf-series-airplanes-equipped-with)
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