# Proposed AD 2000-NM-377-AD: Boeing Model 747 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-10-06
- Products: Boeing
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: June 21, 2002, 67 FR 42207
- Comments due: July 26, 2002
- Became: [AD 2003-10-06](https://openairdocs.org/ad/2003-10-06)
- Docket: 2000-NM-377-AD
- FR document: 02-15663
- Official PDF: https://openairdocs.org/files/sha256/13/7e/137e0533a8b503aaa17302faece99cbdca588a6e13c0d35a6d78988f364a135b (from https://www.govinfo.gov/content/pkg/FR-2002-06-21/pdf/02-15663.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/06/21/02-15663/airworthiness-directives-boeing-model-747-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F6AC37300EC537C886256BDF0055E47E.0001
- Page: https://openairdocs.org/proposed/2000-NM-377-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that would have required repetitive inspections for cracking of the skin, bear strap, and sill chord of the lower lobe cargo door cutout, and repair, if necessary. For certain airplanes, the proposed AD also would have provided an optional modification of the lower lobe cargo door cutout, which would have ended the pre-modification repetitive inspections, but would have necessitated new post-modification repetitive inspections after a certain time. This new action, prompted by new crack findings, revises the proposed rule by expanding the optional modification of the lower lobe cargo door cutout and reducing the compliance threshold for the post-modification inspections. The proposed actions are necessary to find and fix cracking of the skin, bear strap, and sill chord of the lower lobe cargo door cutout, which could lead to reduced structural integrity of the lower lobe cargo door cutout, and result in rapid depressurization of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Oct 30, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-27190, comments due Dec 14, 2001 (https://www.federalregister.gov/documents/2001/10/30/01-27190/airworthiness-directives-boeing-model-747-series-airplanes)
- Jun 21, 2002: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 02-15663, comments due Jul 26, 2002 (https://www.federalregister.gov/documents/2002/06/21/02-15663/airworthiness-directives-boeing-model-747-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.