# Airworthiness Directives; BAE Systems (Operations) Limited Model Avro 146-RJ Series Airplanes
> **Rule** · Final rule. · Published 2005-04-25 · Effective 2005-05-31 · 70 FR 21137
## Document
- **Document number:** 05-8096
- **Category:** airworthiness
- **Manufacturer:** BAE Systems (Operations) Limited Model Avro 146-RJ Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 21137
- **Publication date:** 2005-04-25
- **Effective date:** 2005-05-31
- **FAA docket:** Docket No. FAA-2005-20078
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all BAE Systems (Operations) Limited Model Avro 146-RJ series airplanes. This AD requires an inspection of the Thales Avionics distance bearing indicator (DBI) to determine part number (P/N) and serial number (S/N), and replacement of the affected DBI with a new or modified DBI. This AD is prompted by a report of defective electrical insulators in DBIs. We are issuing this AD to prevent a short circuit in the DBI due to defective electrical insulation, which could potentially cause a loss of primary navigation instruments (such as airspeed indicator, altimeter, and global positioning system (GPS) information).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/04/25/05-8096/airworthiness-directives-bae-systems-operations-limited-model-avro-146-rj-series-airplanes)
---
*AI Analytics · CC0 1.0*