# Proposed AD FAA-2021-1177: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2022-13-10
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: January 31, 2022, 87 FR 4828
- Comments due: March 17, 2022
- Became: [AD 2022-13-10](https://openairdocs.org/ad/2022-13-10)
- Docket: FAA-2021-1177 (https://www.regulations.gov/docket/FAA-2021-1177, where comments are filed)
- Project: AD-2021-00570-T
- FR document: 2022-01856
- Official PDF: https://openairdocs.org/files/sha256/36/96/369690c89935738d59a2134aaf2a2e4c315a5c3f56db9540b651fa385181f301 (from https://www.govinfo.gov/content/pkg/FR-2022-01-31/pdf/2022-01856.pdf)
- Federal Register: https://www.federalregister.gov/documents/2022/01/31/2022-01856/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2022-01856-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2021-1177

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 767-200, -300, -300F, and -400ER airplanes. This proposed AD was prompted by reports of burned Boeing Material Specification (BMS) 8-39 urethane foam, which is a material with fire-retardant properties that deteriorate with age. This proposed AD would require replacing certain BMS 8-39 foam pads with Nomex felt in certain areas, removing certain BMS 8-39 foam pads in a certain area (which includes a general visual inspection to find BMS 8-39 foam pads), and inspecting the corner seals to determine if the corner seals were replaced, and replacing affected corner seals. This proposed AD would also prohibit the installation of BMS 8-39 urethane foam seal in certain locations. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Jan 31, 2022: Notice of proposed rulemaking (NPRM). (first notice), FR document 2022-01856, comments due Mar 17, 2022 (https://www.federalregister.gov/documents/2022/01/31/2022-01856/airworthiness-directives-the-boeing-company-airplanes)

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