# Proposed AD FAA-2009-0136: Boeing Model 747 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-19-05
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 23, 2009, 74 FR 8034
- Comments due: April 9, 2009
- Became: [AD 2009-19-05](https://openairdocs.org/ad/2009-19-05)
- Docket: FAA-2009-0136 (https://www.regulations.gov/docket/FAA-2009-0136, where comments are filed)
- Project: 2008-NM-171-AD
- FR document: E9-3771
- Official PDF: https://openairdocs.org/files/sha256/55/7e/557e34ae55fccaa6269e03e6b236ce99914d6f42d971f85d7307d89b19a7593c (from https://www.govinfo.gov/content/pkg/FR-2009-02-23/pdf/E9-3771.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/02/23/E9-3771/airworthiness-directives-boeing-model-747-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/664F5D41FB29EB6B862575660060D5FC.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0136

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 747 airplanes. This proposed AD would require repetitive inspections for cracking of the fuselage frames in section 41, and corrective actions if necessary. This proposed AD results from reports of cracking in fuselage frames made of 2024 aluminum alloy that were installed during previous modification of the frames in section 41 and during production. We are proposing this AD to detect and correct frame cracks, which could result in cracking of the adjacent fuselage skin and consequent rapid decompression of the airplane.

## Notices in this docket

- Feb 23, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-3771, comments due Apr 9, 2009 (https://www.federalregister.gov/documents/2009/02/23/E9-3771/airworthiness-directives-boeing-model-747-airplanes)

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