# Proposed AD FAA-2005-21088: Boeing Model 747-400 and 747-400D Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-16-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 3, 2005, 70 FR 22826
- Comments due: June 17, 2005
- Became: [AD 2005-16-10](https://openairdocs.org/ad/2005-16-10)
- Docket: FAA-2005-21088 (https://www.regulations.gov/docket/FAA-2005-21088, where comments are filed)
- Project: 2004-NM-267-AD
- FR document: 05-8761
- Official PDF: https://openairdocs.org/files/sha256/4a/ca/4aca362a111cac93a6f100257b99a5086d4685e529c64f65dbaed69d6ad8c390 (from https://www.govinfo.gov/content/pkg/FR-2005-05-03/pdf/05-8761.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/05/03/05-8761/airworthiness-directives-boeing-model-747-400-and-747-400d-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/82F09EBCCB6ED9C186256FF6004AA67D.0001
- Page: https://openairdocs.org/proposed/FAA-2005-21088

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 747-400 and 747-400D series airplanes. This proposed AD would require an inspection for corrosion and cracks of the station 980 upper deck floor beam, and repair and related investigative actions if necessary. This proposed AD is prompted by reports of corrosion under the cart lift threshold at the station 980 upper deck floor beam. We are proposing this AD to detect and correct such corrosion, which could result in a cracked or broken floor beam, extensive damage to adjacent structure, and possible rapid decompression of the airplane.

## Notices in this docket

- May 3, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-8761, comments due Jun 17, 2005 (https://www.federalregister.gov/documents/2005/05/03/05-8761/airworthiness-directives-boeing-model-747-400-and-747-400d-series-airplanes)

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