AD 2023-13-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
The continued deployment of new 5G C-Band base stations, whose signals are expected to cover most of the contiguous United States at transmission frequencies between 3.7-3.98 GHz, may result in unavailable or misleading radio altimeter information, adversely affecting the performance of the automatic flight control system (AFCS).
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Required Actions
Revising the airplane flight manual (AFM) to incorporate limitations prohibiting dispatch with use of a certain master minimum equipment list (MMEL) item at all airports for non-radio altimeter tolerant airplanes. For radio altimeter tolerant airplanes, the prohibited operations are allowed at 5G CMAs as identified in an FAA Domestic Notice.
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Compliance Time
Before further flight
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Affected Aircraft
Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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