# Proposed AD FAA-2021-0503: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2021-21-09
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 30, 2021, 86 FR 34660
- Comments due: August 16, 2021
- Became: [AD 2021-21-09](https://openairdocs.org/ad/2021-21-09)
- Docket: FAA-2021-0503 (https://www.regulations.gov/docket/FAA-2021-0503, where comments are filed)
- Project: AD-2021-00163-T
- FR document: 2021-13930
- Official PDF: https://openairdocs.org/files/sha256/2f/16/2f16b9bb1afbe067dbc9dc6434f7d54009d746f1392fa29ecef29e5fe3fd1c93 (from https://www.govinfo.gov/content/pkg/FR-2021-06-30/pdf/2021-13930.pdf)
- Federal Register: https://www.federalregister.gov/documents/2021/06/30/2021-13930/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2D369B79A899CFDD862587040051B172.0001
- Page: https://openairdocs.org/proposed/FAA-2021-0503

## Summary

The FAA proposes to supersede Airworthiness Directive (AD) 2005-05-18, which applies to certain The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes. AD 2005-05-18 requires repetitive inspections for cracking of the webs of the aft pressure bulkhead at a certain body station, and corrective action if necessary. Since the FAA issued AD 2005-05-18, cracking was found in that inspection area on airplanes not identified in the applicability of AD 2005-05-18. This proposed AD would retain the requirements of AD 2005- 05-18, revise the applicability to include additional airplanes, and add an inspection for existing repairs on the newly added airplanes. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jun 30, 2021: Notice of proposed rulemaking (NPRM). (first notice), FR document 2021-13930, comments due Aug 16, 2021 (https://www.federalregister.gov/documents/2021/06/30/2021-13930/airworthiness-directives-the-boeing-company-airplanes)

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