# Proposed AD FAA-2013-0706: the Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-25-12
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 11, 2013, 78 FR 55662
- Comments due: October 28, 2013
- Became: [AD 2013-25-12](https://openairdocs.org/ad/2013-25-12)
- Docket: FAA-2013-0706 (https://www.regulations.gov/docket/FAA-2013-0706, where comments are filed)
- Project: 2013-NM-067-AD
- FR document: 2013-22147
- Official PDF: https://openairdocs.org/files/sha256/4a/41/4a4169cb79d5e48fe346e9bc87e883da970d34f6722fbf316bc7bb30e3ec43d3 (from https://www.govinfo.gov/content/pkg/FR-2013-09-11/pdf/2013-22147.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/09/11/2013-22147/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/678E92C135CF8BB486257BE300498A0B.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0706

## Summary

We propose to adopt a new airworthiness directive (AD) for certain the Boeing Company Model DC-9-10, DC-9-30, and DC-9-40 series airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) indicating that the aft pressure bulkhead web area is subject to widespread fatigue damage (WFD). This proposed AD would require modifying the aft pressure bulkhead. The modification includes inspecting for cracks around the rivet holes, and repair of any cracking. We are proposing this AD to prevent fatigue cracking of the aft pressure bulkhead, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Sep 11, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-22147, comments due Oct 28, 2013 (https://www.federalregister.gov/documents/2013/09/11/2013-22147/airworthiness-directives-the-boeing-company-airplanes)

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