# Proposed AD FAA-2010-0383: The Boeing Company Model 747-100, 747- 100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747SR, and 747SP Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-14-17
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 21, 2010, 75 FR 20792
- Comments due: June 7, 2010
- Became: [AD 2010-14-17](https://openairdocs.org/ad/2010-14-17)
- Docket: FAA-2010-0383 (https://www.regulations.gov/docket/FAA-2010-0383, where comments are filed)
- Project: 2009-NM-214-AD
- FR document: 2010-9112
- Official PDF: https://openairdocs.org/files/sha256/88/6f/886fd7c012d88785ee7ee94345be9131dd78d2840ac78ca9beea49718c7aaa89 (from https://www.govinfo.gov/content/pkg/FR-2010-04-21/pdf/2010-9112.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/21/2010-9112/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B467EB33A57770658625770C0049AC74.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0383

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747- 200F, 747-300, 747-400, 747SR, and 747SP series airplanes. This proposed AD would require repetitive detailed inspections of certain overwing intercostal webs, and related investigative and corrective actions if necessary. This proposed AD results from reports of cracks in overwing intercostal webs. We are proposing this AD to detect and correct such cracking, which could grow and result in a severed intercostal. If an intercostal is severed, cracks could develop in the adjacent frame structure and skin, resulting in a rapid loss of cabin pressure.

## Notices in this docket

- Apr 21, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-9112, comments due Jun 7, 2010 (https://www.federalregister.gov/documents/2010/04/21/2010-9112/airworthiness-directives-the-boeing-company-model-747-100-747-100b-747-100b-sud-747-200b-747-200c)

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