# Proposed AD FAA-2016-9520: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-16-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 3, 2017, 82 FR 54
- Comments due: February 17, 2017
- Became: [AD 2017-16-10](https://openairdocs.org/ad/2017-16-10)
- Docket: FAA-2016-9520 (https://www.regulations.gov/docket/FAA-2016-9520, where comments are filed)
- Project: 2016-NM-163-AD
- FR document: 2016-30807
- Official PDF: https://openairdocs.org/files/sha256/4b/9e/4b9e25db335a40c845cf24a265aeab977829dff2a47917bbd56441ff1df60580 (from https://www.govinfo.gov/content/pkg/FR-2017-01-03/pdf/2016-30807.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/01/03/2016-30807/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9EA25E0958220AF68625809D00551248.0001
- Page: https://openairdocs.org/proposed/FAA-2016-9520

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This proposed AD was prompted by reports of cracks on the underwing longerons. This proposed AD would require repetitive inspections of the left and right side underwing longerons for any crack, and related investigative and corrective actions if necessary. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 3, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2016-30807, comments due Feb 17, 2017 (https://www.federalregister.gov/documents/2017/01/03/2016-30807/airworthiness-directives-the-boeing-company-airplanes)

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