# Proposed AD FAA-2015-8131: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2016-13-11
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 12, 2016, 81 FR 1345
- Comments due: February 26, 2016
- Became: [AD 2016-13-11](https://openairdocs.org/ad/2016-13-11)
- Docket: FAA-2015-8131 (https://www.regulations.gov/docket/FAA-2015-8131, where comments are filed)
- Project: 2015-NM-073-AD
- FR document: 2015-32851
- Official PDF: https://openairdocs.org/files/sha256/ab/1d/ab1d55de5664a7ef7df44dedf7d6e21714adf640533140a08ca5c50e7d22abe1 (from https://www.govinfo.gov/content/pkg/FR-2016-01-12/pdf/2015-32851.pdf)
- Federal Register: https://www.federalregister.gov/documents/2016/01/12/2015-32851/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3CF276198F49261C86257F380055BBB1.0001
- Page: https://openairdocs.org/proposed/FAA-2015-8131

## Summary

We propose to supersede Airworthiness Directive (AD) 2008-05- 06, which applies to certain The Boeing Company Model 737-100, -200, - 300, -400, and -500 series airplanes. AD 2008-05-06 currently requires repetitive inspections for fatigue cracking in the longitudinal floor beam web, upper chord, and lower chord located at certain body stations, and repair if necessary. Since we issued AD 2008-05-06, we have determined that certain repairs and preventive modifications of certain longitudinal floor beam webs inadvertently omitted installation of tapered fillers. Omission of the tapered fillers creates a preload condition that may promote undetected fatigue cracking and subsequent failure of certain longitudinal floor beams. For certain airplanes, this proposed AD would require an inspection to determine if tapered fillers are installed, and related investigative and corrective actions if necessary. We are proposing this AD to detect and correct fatigue cracking of the upper andlower chords and web of the longitudinal floor beams, which could result in rapid loss of cabin pressure.

## Notices in this docket

- Jan 12, 2016: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-32851, comments due Feb 26, 2016 (https://www.federalregister.gov/documents/2016/01/12/2015-32851/airworthiness-directives-the-boeing-company-airplanes)

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