# Proposed AD FAA-2019-0114: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-14-02
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 1, 2019, 84 FR 6981
- Comments due: April 15, 2019
- Became: [AD 2019-14-02](https://openairdocs.org/ad/2019-14-02)
- Docket: FAA-2019-0114 (https://www.regulations.gov/docket/FAA-2019-0114, where comments are filed)
- FR document: 2019-03431
- Official PDF: https://openairdocs.org/files/sha256/c3/56/c35694aa1b7a931605ee06c66f0e3909d148575e5010db4b4e8b6378fb68e269 (from https://www.govinfo.gov/content/pkg/FR-2019-03-01/pdf/2019-03431.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/03/01/2019-03431/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/12C2ED5F50CEC302862583BB00581CFA.0001
- Page: https://openairdocs.org/proposed/FAA-2019-0114

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737 series airplanes. This proposed AD was prompted by a report that structural fatigue cracks can develop in certain aluminum pressure module check valves prior to the design limit. This proposed AD would require an inspection to determine the part numbers of the four hydraulic systems A and B pressure module check valves and applicable on-condition actions. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Mar 1, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-03431, comments due Apr 15, 2019 (https://www.federalregister.gov/documents/2019/03/01/2019-03431/airworthiness-directives-the-boeing-company-airplanes)

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