# Proposed AD FAA-2012-0723: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-19-04
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 25, 2012, 77 FR 43547
- Comments due: September 10, 2012
- Became: [AD 2013-19-04](https://openairdocs.org/ad/2013-19-04)
- Docket: FAA-2012-0723 (https://www.regulations.gov/docket/FAA-2012-0723, where comments are filed)
- Project: 2011-NM-137-AD
- FR document: 2012-18147
- Official PDF: https://openairdocs.org/files/sha256/53/6d/536d63321d06692f4f52e464ddc453e4a011d66a9ad61a57bf686a68360694d8 (from https://www.govinfo.gov/content/pkg/FR-2012-07-25/pdf/2012-18147.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/07/25/2012-18147/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/98EF1B101942E09186257A46004AC9D0.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0723

## Summary

We propose to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes. This proposed AD was prompted by a report of cracks found in the skin at body station (STA) 540 just below stringer S-22L on a Model 737-700 series airplane. This proposed AD would require repetitive detailed and high frequency eddy current inspections for cracking of the skin around the eight fasteners common to the ends of the STA 540 bulkhead chords between stringers S-22 and S-23, left and right sides; and corrective actions and preventive modification if necessary. We are proposing this AD to detect and correct fatigue cracking in the skin, which can result in rapid decompression of the cabin.

## Notices in this docket

- Jul 25, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-18147, comments due Sep 10, 2012 (https://www.federalregister.gov/documents/2012/07/25/2012-18147/airworthiness-directives-the-boeing-company-airplanes)

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