# Proposed AD FAA-2026-3870: Textron Aviation Inc. Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Comment period closed
- Products: Textron
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 29, 2026, 91 FR 23023
- Comments due: June 15, 2026
- Docket: FAA-2026-3870 (https://www.regulations.gov/docket/FAA-2026-3870, where comments are filed)
- Project: AD-2025-01364-A
- FR document: 2026-08322
- Official PDF: https://openairdocs.org/files/sha256/4f/0b/4f0bdcab8b2d246a6624cd0af2f9ee9708c4443c61aeb67d1cea54b8f04993c8 (from https://www.govinfo.gov/content/pkg/FR-2026-04-29/pdf/2026-08322.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/04/29/2026-08322/airworthiness-directives-textron-aviation-inc-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-08322-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-3870

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for certain Textron Aviation, Inc., Model 408 airplanes. This proposed AD was prompted by the manufacturer's revision of the aircraft maintenance manual (AMM) to add a detailed inspection for the horizontal stabilizer spar, and change the airplane serial effectivity for the vertical stabilizer spar detailed inspection. This proposed AD would require revising the Airworthiness Limitations Section (ALS) of the existing AMM or instructions for continued airworthiness (ICA) and the existing approved maintenance or inspection program, as applicable. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Apr 29, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-08322, comments due Jun 15, 2026 (https://www.federalregister.gov/documents/2026/04/29/2026-08322/airworthiness-directives-textron-aviation-inc-airplanes)

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