AD 2023-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Transport | and Commuter Category | Airworthiness Directives; Transport and Commuter Category Airplanes |
Unsafe Condition
Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additionally, radio altimeter anomalies could lead to increased flightcrew workload and flightcrew desensitization to warnings.
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Required Actions
Revising the existing AFM to incorporate limitations prohibiting certain operations in the presence of 5G C-Band wireless broadband interference as identified by NOTAM. Alternatively, operators may retain the AFM revision required by paragraph (g) of AD 2021-23-12. For radio altimeter tolerant airplanes, the prohibited operations would be allowed at 5G C-Band mitigated airports (5G CMAs) as identified in an FAA Domestic Notice. On or before February 1, 2024, airplanes operating under 14 CFR part 121 must be modified from a non-radio altimeter tolerant airplane to a radio altimeter tolerant airplane.
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Compliance Time
Before further flight
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Affected Aircraft
All transport and commuter category airplanes equipped with a radio (also known as radar) altimeter.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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