# Proposed AD FAA-2006-25470: Boeing Model 747-400 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2007-04-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 1, 2006, 71 FR 43390
- Comments due: September 15, 2006
- Became: [AD 2007-04-10](https://openairdocs.org/ad/2007-04-10)
- Docket: FAA-2006-25470 (https://www.regulations.gov/docket/FAA-2006-25470, where comments are filed)
- Project: 2006-NM-090-AD
- FR document: E6-12302
- Official PDF: https://openairdocs.org/files/sha256/ab/d0/abd0e58eab39f6ffc242922513017fbfa714dceb1059e7333ade6fcdc4af85b2 (from https://www.govinfo.gov/content/pkg/FR-2006-08-01/pdf/E6-12302.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/08/01/E6-12302/airworthiness-directives-boeing-model-747-400-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/198E1FC88B951486862571BD00551471.0001
- Page: https://openairdocs.org/proposed/FAA-2006-25470

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain Boeing Model 747-400 series airplanes. The existing AD currently requires replacement of the decompression panels that are located in the smoke barrier between the passenger and main deck cargo compartment with new panels of an improved design. This proposed AD would require modification of the decompression panels on the smoke barrier in the main deck cargo compartment or replacement of the smoke barrier with an improved smoke barrier, as applicable. This proposed AD would also require repetitive inspections of the decompression (vent) panels on the smoke barrier and corrective actions if necessary. This proposed AD also adds airplanes to the applicability. This proposed AD results from reports of decompression panels on the smoke barrier opening in flight and on the ground without a decompression event. We are proposing this AD to prevent inadvertent opening or tearing of decompression panels, which could result in degraded cargo fire detection and suppression capability, smoke penetration into an occupied compartment, and an uncontrolled cargo fire, if a fire occurs in the main deck cargo compartment.

## Notices in this docket

- Aug 1, 2006: Notice of proposed rulemaking (NPRM). (first notice), FR document E6-12302, comments due Sep 15, 2006 (https://www.federalregister.gov/documents/2006/08/01/E6-12302/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.