# Proposed AD FAA-2009-0452: Boeing Model 737-100, -200, -200C, - 300, -400, and -500 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-05-13
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 20, 2009, 74 FR 23664
- Comments due: July 6, 2009
- Became: [AD 2010-05-13](https://openairdocs.org/ad/2010-05-13)
- Docket: FAA-2009-0452 (https://www.regulations.gov/docket/FAA-2009-0452, where comments are filed)
- Project: 2007-NM-326-AD
- FR document: E9-11707
- Official PDF: https://openairdocs.org/files/sha256/f6/16/f6165b0d118f4d3d9813d9a5205c0639b2c4e82ce04cecf22ddd3b3ec2ab1740 (from https://www.govinfo.gov/content/pkg/FR-2009-05-20/pdf/E9-11707.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/05/20/E9-11707/airworthiness-directives-boeing-model-737-100--200--200c--300--400-and--500-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D41A89CDCD3E85D7862575BC006D5FF4.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0452

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all Boeing Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. The existing AD currently requires a one-time inspection for scribe lines and cracks in the fuselage skin at certain lap joints, butt joints, external repair doublers, and other areas; and related investigative/corrective actions if necessary. This proposed AD would expand the area to be inspected and, for certain airplanes, require earlier inspections for certain inspection zones. This proposed AD results from additional detailed analysis of fuselage skin cracks adjacent to the skin lap joints on airplanes that had scribe lines; the analysis resulted in different inspection zones, thresholds and repetitive intervals, and airplane groupings. We are proposing this AD to prevent rapid decompression of the airplane due to fatigue cracks

## Notices in this docket

- May 20, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-11707, comments due Jul 6, 2009 (https://www.federalregister.gov/documents/2009/05/20/E9-11707/airworthiness-directives-boeing-model-737-100--200--200c--300--400-and--500-series-airplanes)

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