AD 2001-15-17
Unsafe Condition
Noise generation within the CTL-92 transponder control panels that the transponder can interpret and transmit as a random altitude, leading to erroneous altitude interpretations by ATC and TCAS-equipped aircraft.
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Required Actions
Modify the altitude encoder inputs of the CTL-92 transponder control panels as specified in Rockwell Collins Service Bulletin 33 (CTL-92-34-33), dated April 5, 2001.
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Compliance Time
Before further flight
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Affected Aircraft
Rockwell Collins CTL-92 transponder control panels with part numbers 622-6523-204, 622-6523-205, 622-6523-206, 622-6523-207, and 622-6523-208 (serial numbers as specified in Service Bulletin 33), installed in aircraft including Aerospatiale ATR42 and ATR72 series, Saab Models 340B and SF340A, Embraer EMB-120 series, deHavilland DHC-8 series, and Raytheon Models C90A, B200, 350, and 1900D.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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