# Proposed AD FAA-2019-0522: Airbus SAS Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-19-01
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: July 8, 2019, 84 FR 32338
- Comments due: August 22, 2019
- Became: [AD 2019-19-01](https://openairdocs.org/ad/2019-19-01)
- Docket: FAA-2019-0522 (https://www.regulations.gov/docket/FAA-2019-0522, where comments are filed)
- FR document: 2019-14286
- Official PDF: https://openairdocs.org/files/sha256/e7/90/e790acca0f79fe66a777ed327c188b232a53d83a8b3ffe169cd96b73dd135f71 (from https://www.govinfo.gov/content/pkg/FR-2019-07-08/pdf/2019-14286.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/07/08/2019-14286/airworthiness-directives-airbus-sas-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/740E63AEB80E8A4D8625843100587FA1.0001
- Page: https://openairdocs.org/proposed/FAA-2019-0522

## Summary

The FAA proposes to adopt 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 proposed 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 proposed AD would require uploading improved bleed monitoring computer (BMC) software (SW), as specified in a European Aviation Safety Agency (EASA) AD, which will be incorporated by reference. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jul 8, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-14286, comments due Aug 22, 2019 (https://www.federalregister.gov/documents/2019/07/08/2019-14286/airworthiness-directives-airbus-sas-airplanes)

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