# Proposed AD FAA-2013-0546: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-21-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 17, 2013, 78 FR 42720
- Comments due: September 3, 2013
- Became: [AD 2013-21-07](https://openairdocs.org/ad/2013-21-07)
- Docket: FAA-2013-0546 (https://www.regulations.gov/docket/FAA-2013-0546, where comments are filed)
- Project: 2013-NM-050-AD
- FR document: 2013-17138
- Official PDF: https://openairdocs.org/files/sha256/e4/2d/e42df8417313ba3030a5f73b8dbc8ea389880937dbb2374676414a5de20fd162 (from https://www.govinfo.gov/content/pkg/FR-2013-07-17/pdf/2013-17138.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/07/17/2013-17138/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E30F9B08DD46479D86257BAB0049B281.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0546

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 727 airplanes. This proposed AD is intended to complete certain mandated programs intended to support the airplane reaching its limit of validity (LOV) of the engineering data that support the established structural maintenance program. For certain airplanes, this proposed AD would require modification of the web of the horizontal stabilizer center section rear spar. For the other airplanes, this proposed AD would require an inspection for cracks in the web, and repair or modification as applicable. We are proposing this AD to prevent cracking at the upper fastener holes in the riveted web in the horizontal stabilizer center section rear spar, which could result in failure of the spar forging and lead to horizontal stabilizer separation and loss of control of the airplane.

## Notices in this docket

- Jul 17, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-17138, comments due Sep 3, 2013 (https://www.federalregister.gov/documents/2013/07/17/2013-17138/airworthiness-directives-the-boeing-company-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.