# Airworthiness Directives; Airbus SAS Airplanes
> **Rule** · Final rule. · Published 2019-11-06 · Effective 2019-12-11 · 84 FR 59716
## Document
- **Document number:** 2019-24159
- **Category:** airworthiness
- **Manufacturer:** Airbus SAS
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 84 FR 59716
- **Publication date:** 2019-11-06
- **Effective date:** 2019-12-11
- **FAA docket:** Docket No. FAA-2019-0522
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Airbus SAS Model A320-251N and -271N airplanes, and Model A321-251N, - 253N, -271N, and -272N airplanes. This AD was prompted by reports that the regulated bleed temperature was measured above the design target with a temperature regulation shift phenomenon, and investigation results show that incorrect temperature regulation can degrade pneumatic system components located downstream of the pre-cooler. This AD requires uploading improved bleed monitoring computer (BMC) software (SW), as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/11/06/2019-24159/airworthiness-directives-airbus-sas-airplanes)
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