# Proposed AD 2001-NM-394-AD: Boeing Model 747 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-11-25
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 25, 2002, 67 FR 60189
- Comments due: November 12, 2002
- Became: [AD 2003-11-25](https://openairdocs.org/ad/2003-11-25)
- Docket: 2001-NM-394-AD
- FR document: 02-24281
- Official PDF: https://openairdocs.org/files/sha256/a0/3d/a03d229d10fd20fa470fc5cf4789d0e57047728d4dc27a32a686f70589761516 (from https://www.govinfo.gov/content/pkg/FR-2002-09-25/pdf/02-24281.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/09/25/02-24281/airworthiness-directives-boeing-model-747-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/29D74BE0DD90224986256C3F005BFFFB.0001
- Page: https://openairdocs.org/proposed/2001-NM-394-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747 series airplanes. This proposal would require an initial inspection to identify all H-11 steel bolts on the outer chord of the body station (BS) 2360 aft pressure bulkhead between stringers 12L and 12R; follow-on repetitive inspections to identify all remaining H-11 steel bolts on the entire outer chord of the BS 2360 aft pressure bulkhead; and follow-on and corrective actions, if necessary. This proposal also would require eventual replacement of all H-11 steel bolts with Inconel bolts. This action is necessary to prevent broken bolts, which could result in progressive failure of the remaining bolts and consequent structural damage and rapid depressurization of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Sep 25, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-24281, comments due Nov 12, 2002 (https://www.federalregister.gov/documents/2002/09/25/02-24281/airworthiness-directives-boeing-model-747-series-airplanes)

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