# Proposed AD FAA-2005-22288: Boeing Model 747-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-10-09
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 6, 2005, 70 FR 52943
- Comments due: October 21, 2005
- Became: [AD 2007-10-09](https://openairdocs.org/ad/2007-10-09)
- Docket: FAA-2005-22288 (https://www.regulations.gov/docket/FAA-2005-22288, where comments are filed)
- Project: 2005-NM-132-AD
- FR document: 05-17608
- Official PDF: https://openairdocs.org/files/sha256/32/0d/320d4185ac19e37ae897de29a410dfbcd7a70e0c3ea2dfbe5e6b38ba7dfcfe35 (from https://www.govinfo.gov/content/pkg/FR-2005-09-06/pdf/05-17608.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/09/06/05-17608/airworthiness-directives-boeing-model-747-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4A257B7E7C637D9086257074005666CF.0001
- Page: https://openairdocs.org/proposed/FAA-2005-22288

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Boeing Model 747-400 series airplanes. This proposed AD would require doing a conductivity test of the upper deck floor beam at station 400 to identify the floor beam material. If the floor beam is manufactured from 7050 aluminum alloy, this proposed AD would also require inspecting the upper deck floor beam and certain fastener holes at the floor beam upper chord for cracking; repairing any cracking if necessary; and doing a preventative modification. This proposed AD results from several reports indicating that fatigue cracking was found in upper deck floor beams made from 7050 aluminum alloy. We are proposing this AD to find and fix cracking in the upper deck floor beam, which could extend and sever the floor beam. A severed floor beam could result in loss of controllability and rapid decompression of the airplane.

## Notices in this docket

- Sep 6, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-17608, comments due Oct 21, 2005 (https://www.federalregister.gov/documents/2005/09/06/05-17608/airworthiness-directives-boeing-model-747-400-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.