# Proposed AD FAA-2009-0477: Boeing Model 747-100, -100B, -100B SUD, -200B, and -300 Series Airplanes; and Model 747SP and 747SR Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-18-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 26, 2009, 74 FR 24712
- Comments due: July 10, 2009
- Became: [AD 2009-18-07](https://openairdocs.org/ad/2009-18-07)
- Docket: FAA-2009-0477 (https://www.regulations.gov/docket/FAA-2009-0477, where comments are filed)
- Project: 2008-NM-191-AD
- FR document: E9-12111
- Official PDF: https://openairdocs.org/files/sha256/1d/c0/1dc0f9a659411b9cbfb9dfdc10bf5646c51cd91bb8a428fe1c50a6a76885897e (from https://www.govinfo.gov/content/pkg/FR-2009-05-26/pdf/E9-12111.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/05/26/E9-12111/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b-and--300-series-airplanes-and
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2165E29763D3062C862575C3004813C8.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0477

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain Boeing Model 747 series airplanes. The existing AD currently requires repetitive inspections to detect cracks in various areas of the fuselage internal structure, and related investigative/corrective actions if necessary. This proposed AD would require additional repetitive inspections for cracking of certain fuselage structure, and related investigative/corrective actions if necessary. This proposed AD results from fatigue tests and analysis by Boeing that identified areas of the fuselage where fatigue cracks can occur. We are proposing this AD to prevent the loss of the structural integrity of the fuselage, which could result in rapid depressurization of the airplane.

## Notices in this docket

- May 26, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-12111, comments due Jul 10, 2009 (https://www.federalregister.gov/documents/2009/05/26/E9-12111/airworthiness-directives-boeing-model-747-100--100b--100b-sud--200b-and--300-series-airplanes-and)

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