AD Amdt-39-11190
Unsafe Condition
Navigation receiver interference during landing operations caused by frequency modulation (FM) radio station broadcasts, leading to distortion of navigation audio and deflection of the desired flight path.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace AlliedSignal Inc. VN 411B VHF navigation receivers if they do not have Modification 21 incorporated.
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Compliance Time
Before further flight.
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Affected Aircraft
AlliedSignal Inc. VN 411B VHF navigation receivers installed on aircraft without Modification 21 incorporated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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