# Proposed AD FAA-2006-24410: Boeing Model 747 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-02-24
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 11, 2006, 71 FR 18242
- Comments due: May 26, 2006
- Became: [AD 2007-02-24](https://openairdocs.org/ad/2007-02-24)
- Docket: FAA-2006-24410 (https://www.regulations.gov/docket/FAA-2006-24410, where comments are filed)
- Project: 2005-NM-261-AD
- FR document: 06-3433
- Official PDF: https://openairdocs.org/files/sha256/57/46/5746df0f26ec597e6e6cc4195ba788b0ef00338fa87c98757d3736eb1e679870 (from https://www.govinfo.gov/content/pkg/FR-2006-04-11/pdf/06-3433.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/04/11/06-3433/airworthiness-directives-boeing-model-747-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4360A4188BD170058625714D00695D58.0001
- Page: https://openairdocs.org/proposed/FAA-2006-24410

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all Boeing Model 747 airplanes. This proposed AD would require repetitive inspections for cracking of the web of the station (STA) 2360 aft pressure bulkhead around the fastener heads in the critical fastener rows in the web lap joints, from the Y-chord to the inner ring; and repair if necessary. This proposed AD also would require a modification, which would terminate the repetitive inspections. This proposed AD results from analysis by the manufacturer that the radial lap splices of the STA 2360 aft pressure bulkhead are subject to widespread fatigue damage. We are proposing this AD to detect and correct cracking of the bulkhead web at multiple sites along the radial lap splice, which could join together to form cracks of critical length, and result in rapid decompression and loss of control of the airplane.

## Notices in this docket

- Apr 11, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document 06-3433, comments due May 26, 2006 (https://www.federalregister.gov/documents/2006/04/11/06-3433/airworthiness-directives-boeing-model-747-airplanes)

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