# Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146 Series Airplanes
> **Rule** · Final rule. · Published 2003-06-18 · Effective 2003-07-23 · 68 FR 36452
## Document
- **Document number:** 03-15221
- **Category:** airworthiness
- **Manufacturer:** BAE Systems (Operations) Limited Model BAe 146 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 68 FR 36452
- **Publication date:** 2003-06-18
- **Effective date:** 2003-07-23
- **FAA docket:** Docket No. 2001-NM-271-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain BAE Systems (Operations) Limited Model BAe 146 series airplanes, that requires modification of the flight annunciator box. This action is necessary to prevent traffic collision avoidance system (TCAS) aural messages and resolution advisories of the TCAS from being inhibited following a ground proximity warning system alert or test message, which could prevent the TCAS from providing attention- getting alerts, and could result in the consequent possibility of a mid-air collision or near mid-air collision. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2003/06/18/03-15221/airworthiness-directives-bae-systems-operations-limited-model-bae-146-series-airplanes)
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