# Proposed AD FAA-2019-0406: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2019-24-17
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 21, 2019, 84 FR 29105
- Comments due: August 5, 2019
- Became: [AD 2019-24-17](https://openairdocs.org/ad/2019-24-17)
- Docket: FAA-2019-0406 (https://www.regulations.gov/docket/FAA-2019-0406, where comments are filed)
- FR document: 2019-13057
- Official PDF: https://openairdocs.org/files/sha256/68/fd/68fd422aea3e2c8a179240c7d399bb440aeb940b2580508be344ccde57fafccd (from https://www.govinfo.gov/content/pkg/FR-2019-06-21/pdf/2019-13057.pdf)
- Federal Register: https://www.federalregister.gov/documents/2019/06/21/2019-13057/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DA771AF6C0F5CFDF86258420004157C1.0001
- Page: https://openairdocs.org/proposed/FAA-2019-0406

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model MD-90-30 airplanes. This proposed AD was prompted by reports indicating that certain center wing stringers and skins have been identified to potentially be susceptible to cracking. This proposed AD would require repetitive eddy current, low frequency (ETLF) inspections of the left and right side fastener holes for any crack; repetitive eddy current, high frequency (ETHF) inspections of the lower skin for any crack; and repair if any crack is found. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 21, 2019: Notice of proposed rulemaking (NPRM). (first notice), FR document 2019-13057, comments due Aug 5, 2019 (https://www.federalregister.gov/documents/2019/06/21/2019-13057/airworthiness-directives-the-boeing-company-airplanes)

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