# Proposed AD 2003-NM-93-AD: Boeing Model 747-400 and 747-400D Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-09-33
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 3, 2003, 68 FR 67616
- Comments due: January 20, 2004
- Became: [AD 2004-09-33](https://openairdocs.org/ad/2004-09-33)
- Docket: 2003-NM-93-AD
- FR document: 03-30115
- Official PDF: https://openairdocs.org/files/sha256/ef/e9/efe9501c7e4bd52f03ff0eedde43221785f1b77ee1fed783483e04655f5a2c96 (from https://www.govinfo.gov/content/pkg/FR-2003-12-03/pdf/03-30115.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/12/03/03-30115/airworthiness-directives-boeing-model-747-400-and-747-400d-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3CDF4655BDAAF2DD86256DF1005BACBE.0001
- Page: https://openairdocs.org/proposed/2003-NM-93-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-400 and 747-400D series airplanes. This proposal would require a detailed inspection of the fire extinguishing system tube and clamp for correct installation or a repetitive pressure test of the fire extinguishing system tube for leakage, and corrective action, if necessary. This action is necessary to prevent a chafed hole in the fire extinguishing system tube of the aft cargo compartment, which could result in a lack of fire extinguishing agent and consequent uncontained fire in the aft cargo compartment. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Dec 3, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-30115, comments due Jan 20, 2004 (https://www.federalregister.gov/documents/2003/12/03/03-30115/airworthiness-directives-boeing-model-747-400-and-747-400d-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.