# Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ Airplanes
> **Rule** · Final rule. · Published 2005-06-21 · Effective 2005-07-26 · 70 FR 35518
## Document
- **Document number:** 05-12004
- **Category:** airworthiness
- **Manufacturer:** BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 70 FR 35518
- **Publication date:** 2005-06-21
- **Effective date:** 2005-07-26
- **FAA docket:** Docket No. FAA-2005-20757
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain BAE Systems (Operations) Limited Model BAe 146 and Avro 146-RJ airplanes. This AD requires modifying the auxiliary power unit (APU) exhaust duct in the environmental control system (ECS) bay; installing new, improved insulation on this APU exhaust duct; and replacing the existing drain pipe with a new exhaust drain pipe blank. This AD is prompted by a determination that the temperature of the skin of the APU exhaust duct in the ECS bay is higher than the certificated maximum temperature for this area. We are issuing this AD to prevent the potential for ignition of fuel or hydraulic fluid, which could leak from pipes running through the ECS bay. Ignition of these flammable fluids could result in a fire in the ECS bay.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/06/21/05-12004/airworthiness-directives-bae-systems-operations-limited-model-bae-146-and-avro-146-rj-airplanes)
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