# Proposed AD FAA-2016-6428: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-26-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 11, 2016, 81 FR 29206
- Comments due: June 27, 2016
- Became: [AD 2016-26-06](https://openairdocs.org/ad/2016-26-06)
- Docket: FAA-2016-6428 (https://www.regulations.gov/docket/FAA-2016-6428, where comments are filed)
- Project: 2015-NM-119-AD
- FR document: 2016-10915
- Official PDF: https://openairdocs.org/files/sha256/ae/4e/ae4e4a5cafd7a035298df1a856e56b94e659119196264b27c27169a4628bccdd (from https://www.govinfo.gov/content/pkg/FR-2016-05-11/pdf/2016-10915.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/05/11/2016-10915/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4C4CCB9165D3EE0186257FB0004DDF5E.0001
- Page: https://openairdocs.org/proposed/FAA-2016-6428

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 airplanes. This proposed AD was prompted by reports indicating that certain wing side-of-body stringer fittings have been installed with faying surface mismatch beyond the allowed machining tolerance. This proposed AD would require inspection of certain stringer fittings for faying surface mismatch common to the side-of-body rib chord, replacement if necessary, and replacement of the clearance fit fasteners common to the side-of-body fittings and upper side-of-body rib chord with tapered sleeve bolts. We are proposing this AD to prevent an unacceptable reduction of the fatigue life in the upper side-of-body rib chord. Associated fatigue cracks can reduce the structural capability to a point where it cannot sustain limit load, which could adversely affect the structural integrity of the airplane.

## Notices in this docket

- May 11, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-10915, comments due Jun 27, 2016 (https://www.federalregister.gov/documents/2016/05/11/2016-10915/airworthiness-directives-the-boeing-company-airplanes)

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