# Proposed AD FAA-2012-0336: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2012-16-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 17, 2012, 77 FR 22686
- Comments due: June 1, 2012
- Became: [AD 2012-16-07](https://openairdocs.org/ad/2012-16-07)
- Docket: FAA-2012-0336 (https://www.regulations.gov/docket/FAA-2012-0336, where comments are filed)
- Project: 2011-NM-213-AD
- FR document: 2012-9177
- Official PDF: https://openairdocs.org/files/sha256/f7/1e/f71ead0e512132c7ca9a63280ed1f8653a056c9eef0d2b03b3dab0d5bd894b8c (from https://www.govinfo.gov/content/pkg/FR-2012-04-17/pdf/2012-9177.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/04/17/2012-9177/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/29EA8C54507E5487862579E30046E1A4.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0336

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-500 series airplanes. This proposed AD was prompted by reports of chem-mill step cracking on the aft lower lobe fuselage skins. This proposed AD would require inspections of the fuselage skin at the chem-mill steps, and repair if necessary. We are proposing this AD to detect and correct cracking on the aft lower lobe fuselage skins, which could result in decompression of the airplane.

## Notices in this docket

- Apr 17, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-9177, comments due Jun 1, 2012 (https://www.federalregister.gov/documents/2012/04/17/2012-9177/airworthiness-directives-the-boeing-company-airplanes)

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