# Proposed AD FAA-2017-0773: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2017-23-07
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 15, 2017, 82 FR 38641
- Comments due: September 29, 2017
- Became: [AD 2017-23-07](https://openairdocs.org/ad/2017-23-07)
- Docket: FAA-2017-0773 (https://www.regulations.gov/docket/FAA-2017-0773, where comments are filed)
- FR document: 2017-16774
- Official PDF: https://openairdocs.org/files/sha256/65/21/652103f0a71db62fa5a295cb58d91f7714562e62d75f9909d34c2c2b3757f18d (from https://www.govinfo.gov/content/pkg/FR-2017-08-15/pdf/2017-16774.pdf)
- Federal Register: https://www.federalregister.gov/documents/2017/08/15/2017-16774/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5ABA5F2CD131297E8625817D004F2B40.0001
- Page: https://openairdocs.org/proposed/FAA-2017-0773

## Summary

We propose to adopt a new airworthiness directive (AD) for all The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. This proposed AD was prompted by reports of cracks found in the lower chord of the left wing rear spar. This proposed AD would require repetitive inspections for cracking of the lower chord of the rear spar and lower aft skin at wing buttock line (WBL) 157 and applicable on-condition actions. We are proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Aug 15, 2017: Notice of proposed rulemaking (NPRM). (first notice), FR document 2017-16774, comments due Sep 29, 2017 (https://www.federalregister.gov/documents/2017/08/15/2017-16774/airworthiness-directives-the-boeing-company-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.