AD 2021-08-15
Unsafe Condition
The GTS Processor software potentially calculates incorrect range rates, resulting in traffic advisories or RAs being generated when targets are greater than 10 nautical miles (NM) away. This can lead to a mid-air collision with a third airplane.
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Required Actions
Update the GTS processor unit software to version 3.12.1 or later.
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Compliance Time
Within 24 months of the effective date
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Affected Aircraft
Garmin GMN-00962 GTS processor units (GTS 825, GTS 855, GTS 8000) with part number 011-02571-0( ) and software version 3.13 or earlier (except version 3.12.1), installed on Textron Aviation Inc. (Cessna Aircraft Company) Model 525 (Cessna Citation M2), Model 525B (Cessna Citation CJ3+), Model Model 680 Sovereign, Model 680A Latitude, and Model 700 (Cessna Citation Longitude); Embraer S.A. Model EMB-500 (Phenom 100) and Model EMB-505 (Phenom 300); Learjet Inc. Model 45 (Learjet 70) and Model 45 (Learjet 75); and Viking Air Limited (type certificate previously held by Shorts Brothers PLC, Shorts Brothers Limited) Model SD3-60 SHERPA, modified by Field Aerospace STC No. ST00865DE.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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