# Proposed AD FAA-2019-1070: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-17-13
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 10, 2020, 85 FR 1295
- Comments due: February 24, 2020
- Became: [AD 2020-17-13](https://openairdocs.org/ad/2020-17-13)
- Docket: FAA-2019-1070 (https://www.regulations.gov/docket/FAA-2019-1070, where comments are filed)
- FR document: 2020-00059
- Official PDF: https://openairdocs.org/files/sha256/4b/f3/4bf3744c0e0d2d37b798d1e9f6a7ebf32161dd7570d9171891321f576f35c275 (from https://www.govinfo.gov/content/pkg/FR-2020-01-10/pdf/2020-00059.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/01/10/2020-00059/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CEF2D0B40DB68ABC862584EB004983D2.0001
- Page: https://openairdocs.org/proposed/FAA-2019-1070

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 and 787-9 airplanes. This proposed AD was prompted by reports that the cabin air compressor (CAC) outlet check valve failed due to fatigue of the aluminum flappers, and exposed the Y-duct to temperatures above its design limit. This proposed AD would require installing new inboard and outboard CAC outlet check valves on the left-side and right-side cabin air conditioning and temperature control system (CACTCS) packs. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 10, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-00059, comments due Feb 24, 2020 (https://www.federalregister.gov/documents/2020/01/10/2020-00059/airworthiness-directives-the-boeing-company-airplanes)

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