# Proposed AD FAA-2020-0333: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-13-18
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 20, 2020, 85 FR 21791
- Comments due: June 4, 2020
- Became: [AD 2021-13-18](https://openairdocs.org/ad/2021-13-18)
- Docket: FAA-2020-0333 (https://www.regulations.gov/docket/FAA-2020-0333, where comments are filed)
- FR document: 2020-08406
- Official PDF: https://openairdocs.org/files/sha256/af/1f/af1f97cb6456c3f6a424e1298399d810d40d717b11a0554cd4d56fc0b4082de0 (from https://www.govinfo.gov/content/pkg/FR-2020-04-20/pdf/2020-08406.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/04/20/2020-08406/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EE534F71F696EA6686258550004AF557.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0333

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-8 and 737-9 airplanes. This proposed AD was prompted by a report that, after the removal of a spring door opening system (SDOS) actuator with a certain part number, the actuator came apart, injuring one of the maintenance personnel. A design that obscures the SDOS actuator safety marker when the fan cowls are opened contributed to this incident. This proposed AD would require replacing each affected SDOS actuator with a new SDOS actuator and verifying that new safety markers are installed in the proper locations. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 20, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-08406, comments due Jun 4, 2020 (https://www.federalregister.gov/documents/2020/04/20/2020-08406/airworthiness-directives-the-boeing-company-airplanes)

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