# Proposed AD FAA-2007-0224: Boeing Model 737-100, -200, -300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2008-05-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 26, 2007, 72 FR 65911
- Comments due: January 10, 2008
- Became: [AD 2008-05-06](https://openairdocs.org/ad/2008-05-06)
- Docket: FAA-2007-0224 (https://www.regulations.gov/docket/FAA-2007-0224, where comments are filed)
- Project: 2007-NM-188-AD
- FR document: E7-22928
- Official PDF: https://openairdocs.org/files/sha256/33/11/3311341419590faa7fe70f5cea13b1de6644854d290de43bccabd321c77538e6 (from https://www.govinfo.gov/content/pkg/FR-2007-11-26/pdf/E7-22928.pdf)
- Federal Register: https://www.federalregister.gov/documents/2007/11/26/E7-22928/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1EA0A30D254C14B08625739F005CCBCD.0001
- Page: https://openairdocs.org/proposed/FAA-2007-0224

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 737-100, -200, -300, -400, and -500 series airplanes. This proposed AD would require 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. This proposed AD results from several reports of cracks in the center wing box longitudinal floor beams, upper chord, and lower chord. We are proposing this AD to detect and correct fatigue cracking of the upper and lower chords and web of the longitudinal floor beams, which could result in rapid loss of cabin pressure.

## Notices in this docket

- Nov 26, 2007: Notice of proposed rulemaking (NPRM). (first notice), FR document E7-22928, comments due Jan 10, 2008 (https://www.federalregister.gov/documents/2007/11/26/E7-22928/airworthiness-directives-boeing-model-737-100--200--300--400-and--500-series-airplanes)

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