# Airworthiness Directives; BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
> **Rule** · Final rule. · Published 2004-08-10 · Effective 2004-09-14 · 69 FR 48368
## Document
- **Document number:** 04-17756
- **Category:** airworthiness
- **Manufacturer:** BAE Systems (Operations) Limited Model Avro 146-RJ Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 48368
- **Publication date:** 2004-08-10
- **Effective date:** 2004-09-14
- **FAA docket:** Docket No. 2003-NM-92-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes, that requires replacing the existing digital flight guidance computer(s) (DFGC) with a new or modified DFGC(s). This action is necessary to prevent a premature flare from occurring on approach due to erroneous data being provided to the DFGC(s); and also to prevent uncertainty about autopilot engagement status, which could cause the pilot to apply unneeded force to the control column and possibly result in a runaway condition of the autotrim. Either condition could lead to reduced controllability of the airplane. This action is intended to address the identified unsafe conditions.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/08/10/04-17756/airworthiness-directives-bae-systems-operations-limited-model-avro-146-rj-series-airplanes)
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