AD 2023-03-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
Radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G C-Band), resulting in unavailable or misleading radio altimeter information, adversely affecting the performance of the automatic flight control system (AFCS) and increasing flightcrew workload during takeoff, approach, and landing below 400 feet above ground level (AGL).
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Required Actions
Revising the existing airplane flight manual (AFM) with new limitations to prohibit dispatch under MMEL Section 2, CAS Messages, item 'WOW FAULT (ADVISORY)' and to prohibit autopilot and autothrottle operation below 400 feet AGL when in the presence of 5G C-Band interference as identified by NOTAMs.
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Compliance Time
Within 30 days of the effective date
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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 6, 2026
Rights: U.S. Government Public Domain
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