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Airworthiness Directives; Various Helicopters
Proposed rule · Federal Register document 2026-20677
- Published
- 10/08/2026
- Comments due
- 11/23/2026
- 25 days left
- Pages
- 7
Summary
Notice of proposed rulemaking (NPRM).
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.
Details
- Type
- Proposed rule
- Docket
- Docket No. FAA-2026-11799; Project Identifier MCAI-2026-00594-R
- Regulation ID (RIN)
- 2120-AA64
- CFR parts
- 14 CFR 39
- Significant under E.O. 12866
- No
- Topics
- Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety
This page summarizes a Federal Register document. Only the official Federal Register text has legal effect. Comment deadlines can be extended or reopened by a later notice.
Source: Office of the Federal Register, via the Federal Register API · Last updated 10/08/2026