# Airworthiness Directives; Airbus Model A319, A320, and A321 Series Airplanes
> **Rule** · Final rule. · Published 2004-06-22 · Effective 2004-07-27 · 69 FR 34559
## Document
- **Document number:** 04-13701
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 34559
- **Publication date:** 2004-06-22
- **Effective date:** 2004-07-27
- **FAA docket:** Docket No. 2003-NM-63-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A319, A320, and A321 series airplanes. This AD requires replacement of a certain transformer rectifier unit (TRU) with a certain new TRU. This action is necessary to prevent ignition of the input filter capacitors of the TRU in position 2 of the avionics compartment, which could potentially result in smoke in the cockpit. This action is intended to address the identified unsafe condition.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/06/22/04-13701/airworthiness-directives-airbus-model-a319-a320-and-a321-series-airplanes)
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