# Proposed AD FAA-2020-0091: The Boeing Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2020-11-12
- Products: Boeing
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 26, 2020, 85 FR 11000
- Comments due: March 27, 2020
- Became: [AD 2020-11-12](https://openairdocs.org/ad/2020-11-12)
- Docket: FAA-2020-0091 (https://www.regulations.gov/docket/FAA-2020-0091, where comments are filed)
- FR document: 2020-03864
- Official PDF: https://openairdocs.org/files/sha256/dc/d8/dcd8dd01444eb62acc4d8413ce75d4702d70136a3b30de0dbddc730c27d2f051 (from https://www.govinfo.gov/content/pkg/FR-2020-02-26/pdf/2020-03864.pdf)
- Federal Register: https://www.federalregister.gov/documents/2020/02/26/2020-03864/airworthiness-directives-the-boeing-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/165E29782C49E5738625851F007E79BE.0001
- Page: https://openairdocs.org/proposed/FAA-2020-0091

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain The Boeing Company Model 737-8 and 737-9 airplanes. This proposed AD was prompted by a report that certain exterior fairing panels on the top of the engine nacelle and strut (the thumbnail fairing and mid strut fairing panels) may not have the quality of electrical bonding necessary to ensure adequate shielding of the underlying wiring from the electromagnetic effects of lightning strikes or high intensity radiated fields (HIRF), which could potentially lead to a dual engine power loss event from a critical lightning or HIRF exposure event. This proposed AD would require a detailed inspection of the thumbnail fairing panels and mid strut fairing panels for excessive rework of the metallic (aluminum foil) inner surface layer, replacement of any excessively reworked panels, and modification of the thumbnail fairing assembly to ensure adequate bonding. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Feb 26, 2020: Notice of proposed rulemaking (NPRM). (first notice), FR document 2020-03864, comments due Mar 27, 2020 (https://www.federalregister.gov/documents/2020/02/26/2020-03864/airworthiness-directives-the-boeing-company-airplanes)

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