# Proposed AD FAA-2005-23358: Boeing Model 747-100, 747-100B, 747- 100B SUD, 747-200B, 747-300, 747-400, 747-400D, and 747SR Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-09-06
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 20, 2005, 70 FR 75426
- Comments due: February 3, 2006
- Became: [AD 2006-09-06](https://openairdocs.org/ad/2006-09-06)
- Docket: FAA-2005-23358 (https://www.regulations.gov/docket/FAA-2005-23358, where comments are filed)
- Project: 2005-NM-206-AD
- FR document: 05-24242
- Official PDF: https://openairdocs.org/files/sha256/04/55/045563c1af3ae512df794b313f64a5e342d53309d8bd364cec3730ecb21c2ee6 (from https://www.govinfo.gov/content/pkg/FR-2005-12-20/pdf/05-24242.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/12/20/05-24242/airworthiness-directives-boeing-model-747-100-747-100b-747-100b-sud-747-200b-747-300-747-400
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3F6949BC4DBAEF7F862570DD006EC41A.0001
- Page: https://openairdocs.org/proposed/FAA-2005-23358

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain 747-100, -200, and -300 series airplanes. The existing AD currently requires repetitive inspections to detect cracking of certain lower lobe fuselage frames, and repair if necessary. This proposed AD would retain all the requirements of the existing AD, and add airplanes to the applicability. This proposed AD results from reports indicating that fatigue cracks were found in lower lobe frames on the left side of the fuselage. We are proposing this AD to detect and correct fatigue cracking of certain lower lobe fuselage frames, which could lead to fatigue cracks in the fuselage skin, and consequent rapid decompression of the airplane.

## Notices in this docket

- Dec 20, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-24242, comments due Feb 3, 2006 (https://www.federalregister.gov/documents/2005/12/20/05-24242/airworthiness-directives-boeing-model-747-100-747-100b-747-100b-sud-747-200b-747-300-747-400)

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