AD 2023-06-13
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 fly-by-wire (FBW) systems.
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Required Actions
Revising the existing airplane flight manual (AFM) with new limitations to prohibit dispatch under specified MMEL items under Section 1, Line Replaceable Unit (LRU) Component Relief, and Section 2, Crew Alerting System (CAS) Message Relief, 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
Before further flight
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Affected Aircraft
Bombardier, Inc., Model BD-700-2A12 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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