# Proposed AD FAA-2026-11799: Various Helicopters

- Type: Proposed airworthiness directive (not in force)
- Status: Comments due Nov 23
- Products: Airbus Helicopters radio (also known as radar) altimeter
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 8, 2026, 91 FR 64309
- Comments due: November 23, 2026
- Docket: FAA-2026-11799 (https://www.regulations.gov/docket/FAA-2026-11799, where comments are filed)
- Project: MCAI-2026-00594-R
- FR document: 2026-20677
- Official PDF: https://openairdocs.org/files/sha256/34/77/3477e83f738733c289c7ca9d04532f026b5492c2f7321d16c4d3631ebea273cd (from https://www.govinfo.gov/content/pkg/FR-2026-10-08/pdf/2026-20677.pdf)
- Federal Register: https://www.federalregister.gov/documents/2026/10/08/2026-20677/airworthiness-directives-various-helicopters
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FR-ADNPRM-2026-20677-00000000000.0001
- Page: https://openairdocs.org/proposed/FAA-2026-11799

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all helicopters equipped with a radio (also known as radar) altimeter. This proposed AD was prompted by the determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7 to 3.98 GHz frequency band (5G Lower C-Band) while operating in Canadian airspace. This proposed AD would require revising the existing rotorcraft flight manual (RFM) for the helicopter to incorporate limitations prohibiting certain operations requiring radio altimeter data when operating within Canadian airspace. The FAA is proposing this AD to address the unsafe condition on these products.

## Notices in this docket

- Oct 8, 2026: Notice of proposed rulemaking (NPRM). (first notice), FR document 2026-20677, comments due Nov 23, 2026 (https://www.federalregister.gov/documents/2026/10/08/2026-20677/airworthiness-directives-various-helicopters)

---
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.