# Proposed AD 2001-NM-02-AD: Boeing Model 747 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2001-23-15
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 26, 2001, 66 FR 20950
- Comments due: June 11, 2001
- Became: [AD 2001-23-15](https://openairdocs.org/ad/2001-23-15)
- Docket: 2001-NM-02-AD
- FR document: 01-10344
- Official PDF: https://openairdocs.org/files/sha256/05/28/052812f089fdd9e78e280f5bac7325bdd0c976ca85c70637068ed7e556a5be8f (from https://www.govinfo.gov/content/pkg/FR-2001-04-26/pdf/01-10344.pdf)
- Federal Register: https://www.federalregister.gov/documents/2001/04/26/01-10344/airworthiness-directives-boeing-model-747-series-airplanes
- Page: https://openairdocs.org/proposed/2001-NM-02-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that currently requires repetitive detailed visual inspections to find discrepancies of the installation of the midspar fuse pins of the inboard and outboard struts, and follow-on actions, if necessary. The existing AD also provides an optional terminating modification for the repetitive inspections. This action would mandate accomplishment of the previously optional terminating modification. The actions specified by the proposed AD are intended to find and fix discrepancies of the installation of the midspar fuse pins, which could result in loss of the secondary retention capability of the fuse pins, migration of the fuse pins, and consequent loss of the strut and engine from the airplane.

## Notices in this docket

- Apr 26, 2001: Notice of proposed rulemaking (NPRM). (first notice), FR document 01-10344, comments due Jun 11, 2001 (https://www.federalregister.gov/documents/2001/04/26/01-10344/airworthiness-directives-boeing-model-747-series-airplanes)

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