# Airworthiness Directives; Airbus Model A318, A319, A320, and A321 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 2004-12-07 · Effective 2004-12-22 · 69 FR 70537
## Document
- **Document number:** 04-26790
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 69 FR 70537
- **Publication date:** 2004-12-07
- **Effective date:** 2004-12-22
- **FAA docket:** Docket No. FAA-2004-19817
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Airbus Model A318, A319, A320, and A321 series airplanes. This AD requires regularly performing a complete electrical shutdown of the airplane to reset the integrated standby instrument system (ISIS). This AD is prompted by reports indicating that an airplane lost the ISIS, then, during the same flight, lost all electronic instrument system (EIS) display units. We are issuing this AD to prevent loss of the ISIS, which, if combined with loss of all EIS display units, could reduce the flightcrew's situational awareness and contribute to loss of control of the airplane or impact with obstacles or terrain.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/12/07/04-26790/airworthiness-directives-airbus-model-a318-a319-a320-and-a321-series-airplanes)
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