# Proposed AD 2002-NM-64-AD: Boeing Model 777 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2003-12-01
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 30, 2002, 67 FR 55737
- Comments due: October 15, 2002
- Became: [AD 2003-12-01](https://openairdocs.org/ad/2003-12-01)
- Docket: 2002-NM-64-AD
- FR document: 02-22131
- Official PDF: https://openairdocs.org/files/sha256/03/d7/03d78fa04e2381da714fa31c6c25cef46ec920963c10ce1b08be693b56b59af0 (from https://www.govinfo.gov/content/pkg/FR-2002-08-30/pdf/02-22131.pdf)
- Federal Register: https://www.federalregister.gov/documents/2002/08/30/02-22131/airworthiness-directives-boeing-model-777-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/714CB1CE9E5C02D486256C29005B15AD.0001
- Page: https://openairdocs.org/proposed/2002-NM-64-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Boeing Model 777 series airplanes. This proposal would require either a one-time inspection or a review of the airplane maintenance records for both stabilizer trim control modules (STCM) of the trim system of the horizontal stabilizer to determine if STCMs having certain serial numbers are installed; and follow-on corrective actions, if necessary. This proposal also would require eventual replacement of affected STCMs with new or reworked STCMs, which would terminate the follow-on actions. This action is necessary to prevent an uncommanded stabilizer trim due to simultaneous failure of two static seals on one STCM, combined with failure of the automatic shutdown function of the stabilizer trim system. Such failures could result in loss of pitch control and consequent loss of control of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Aug 30, 2002: Notice of proposed rulemaking (NPRM). (first notice), FR document 02-22131, comments due Oct 15, 2002 (https://www.federalregister.gov/documents/2002/08/30/02-22131/airworthiness-directives-boeing-model-777-series-airplanes)

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