# Proposed AD 2000-NM-355-AD: Boeing Model 747-100, -200, -300, 747SP, and 747SR Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2002-10-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 27, 2001, 66 FR 59180
- Comments due: January 11, 2002
- Became: [AD 2002-10-10](https://openairdocs.org/ad/2002-10-10)
- Docket: 2000-NM-355-AD
- FR document: 01-29426
- Official PDF: https://openairdocs.org/files/sha256/54/b9/54b9b32fa9bd74889cb4e98d5715f416809f1ae6d2c98d7b1fec67a3fc6b864c (from https://www.govinfo.gov/content/pkg/FR-2001-11-27/pdf/01-29426.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/11/27/01-29426/airworthiness-directives-boeing-model-747-100--200--300-747sp-and-747sr-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/41D65AB3B27A03B086256B110052FDCC.0001
- Page: https://openairdocs.org/proposed/2000-NM-355-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 747-100, -200, -300, 747SP, and 747SR series airplanes, that currently requires repetitive inspections to detect cracks in various areas of the fuselage internal structure, and repair, if necessary. This action would add new repetitive inspections for cracking of certain areas of the upper chord of the upper deck floor beams, and repair, if necessary. This proposal is prompted by the results of fatigue testing that revealed severed upper chords of the upper deck floor beams due to fatigue cracking. The actions specified by the proposed AD are intended to prevent loss of the structural integrity of the fuselage, which could result in rapid depressurization of the airplane.

## Notices in this docket

- Nov 27, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-29426, comments due Jan 11, 2002 (https://www.federalregister.gov/documents/2001/11/27/01-29426/airworthiness-directives-boeing-model-747-100--200--300-747sp-and-747sr-series-airplanes)

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