# Proposed AD 2002-NM-128-AD: Boeing Model 747-400 Series Airplanes Equipped With General Electric Model CF6-80C2 Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-16-16
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 30, 2003, 68 FR 4731
- Comments due: March 17, 2003
- Became: [AD 2003-16-16](https://openairdocs.org/ad/2003-16-16)
- Docket: 2002-NM-128-AD
- FR document: 03-2097
- Official PDF: https://openairdocs.org/files/sha256/c9/b6/c9b669e05daea5c69950bdb6dea844ebed4f7c1f25d217adb6bf975a3ffbfbd5 (from https://www.govinfo.gov/content/pkg/FR-2003-01-30/pdf/03-2097.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/01/30/03-2097/airworthiness-directives-boeing-model-747-400-series-airplanes-equipped-with-general-electric-model
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/88AB3DE1A26A97AA86256CBE00598EFE.0001
- Page: https://openairdocs.org/proposed/2002-NM-128-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Boeing Model 747-400 series airplanes, that currently requires repetitive tests of the cone brake of the central drive unit (CDU) of the thrust reversers, and corrective actions if necessary. This action would require installation of a thrust reverser actuation system (TRAS) lock and various related modifications and installations. Following installation of the TRAS lock, this action also would require repetitive functional tests of the TRAS lock, and corrective action if necessary. These actions are intended to prevent an inadvertent deployment of a thrust reverser during flight, which could result in loss of control of the airplane.

## Notices in this docket

- Jan 30, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-2097, comments due Mar 17, 2003 (https://www.federalregister.gov/documents/2003/01/30/03-2097/airworthiness-directives-boeing-model-747-400-series-airplanes-equipped-with-general-electric-model)

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