# Proposed AD FAA-2013-0540: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-26-12
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 3, 2013, 78 FR 40050
- Comments due: August 19, 2013
- Became: [AD 2013-26-12](https://openairdocs.org/ad/2013-26-12)
- Docket: FAA-2013-0540 (https://www.regulations.gov/docket/FAA-2013-0540, where comments are filed)
- Project: 2012-NM-185-AD
- FR document: 2013-15948
- Official PDF: https://openairdocs.org/files/sha256/9f/f2/9ff2c92834ba3af91af07114f190ad33a9d601a39e353fa098b249814a9db659 (from https://www.govinfo.gov/content/pkg/FR-2013-07-03/pdf/2013-15948.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/07/03/2013-15948/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6C2B8C4EAD36DA0286257B9D004D66C0.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0540

## Summary

We propose to supersede an existing airworthiness directive (AD) that applies to certain The Boeing Company Model 747-100, 747- 100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes. The existing AD currently requires repetitive inspections for wear damage and cracks of the fuselage skin in the interface area of the vertical stabilizer seal and fuselage skin, a detailed inspection for wear damage and cracks of the surface of any skin repair doubler in the area, and corrective actions if necessary. For airplanes on which the fuselage skin has been blended to remove wear damage, the existing AD also requires repetitive external detailed inspections or high frequency eddy current inspections for cracks of the blended area of the fuselage skin, and corrective actions if necessary. Since we issued that AD, we have received a report of wear through the fuselage skin that occurred sooner than the repetitive inspection interval specified in the existing AD. This proposed AD would reduce the repetitive inspection interval and change certain corrective actions. We are proposing this AD to detect and correct wear damage and cracks of the fuselage skin in the interface area of the vertical stabilizer seal and fuselage skin in sections 46 and 48, which could cause in-flight depressurization of the airplane.

## Notices in this docket

- Jul 3, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-15948, comments due Aug 19, 2013 (https://www.federalregister.gov/documents/2013/07/03/2013-15948/airworthiness-directives-the-boeing-company-airplanes)

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