# Proposed AD 2000-NM-250-AD: Boeing Model 747-100, -200, -300, and 747SP Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-13-06
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 23, 2001, 66 FR 7433
- Comments due: March 9, 2001
- Became: [AD 2001-13-06](https://openairdocs.org/ad/2001-13-06)
- Docket: 2000-NM-250-AD
- FR document: 01-1890
- Official PDF: https://openairdocs.org/files/sha256/46/b8/46b8c7ec9031f78ca7bafc2d9a6735f00700748db452eeb92fa6d797b8832a36 (from https://www.govinfo.gov/content/pkg/FR-2001-01-23/pdf/01-1890.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/01/23/01-1890/airworthiness-directives-boeing-model-747-100--200--300-and-747sp-series-airplanes
- Page: https://openairdocs.org/proposed/2000-NM-250-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Boeing Model 747-100, - 200, -300, and 747SP series airplanes. This proposal would require certain inspections to find missing and alloy-steel taperlock fasteners (bolts) in the diagonal brace underwing fittings; and corrective actions, if necessary. For airplanes with missing or alloy-steel fasteners, this proposal also would mandate replacement of certain fasteners with new fasteners, which would constitute terminating action for the repetitive inspections. This action is necessary to prevent loss of the underwing fitting load path due to missing or damaged alloy-steel taperlock fasteners, which could result in separation of the engine and strut from the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Jan 23, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-1890, comments due Mar 9, 2001 (https://www.federalregister.gov/documents/2001/01/23/01-1890/airworthiness-directives-boeing-model-747-100--200--300-and-747sp-series-airplanes)

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