# Proposed AD 2002-NM-311-AD: Bombardier Model DHC-8-400, -401, and -402 Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-02-05
- Products: Bombardier
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 18, 2003, 68 FR 65003
- Comments due: December 18, 2003
- Became: [AD 2004-02-05](https://openairdocs.org/ad/2004-02-05)
- Docket: 2002-NM-311-AD
- FR document: 03-28732
- Official PDF: https://openairdocs.org/files/sha256/bb/a3/bba3a90636d131ac0679ac6afdc36b0a0b63927f8ec175d68ea2aded8ce52cfd (from https://www.govinfo.gov/content/pkg/FR-2003-11-18/pdf/03-28732.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/11/18/03-28732/airworthiness-directives-bombardier-model-dhc-8-400-401-and-402-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/AEDB58388BBFCDDC86256DE2005BB576.0001
- Page: https://openairdocs.org/proposed/2002-NM-311-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain Bombardier Model DHC-8-400, -401, and -402 airplanes. This proposal would require replacing certain flight guidance modules with improved modules, and certain flight control electronic control units with improved units. This action is necessary to prevent loss of the autopilot or manual pitch trim, which may increase the workload of the flightcrew and, under certain conditions, could result in reduced controllability of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Nov 18, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-28732, comments due Dec 18, 2003 (https://www.federalregister.gov/documents/2003/11/18/03-28732/airworthiness-directives-bombardier-model-dhc-8-400-401-and-402-airplanes)

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