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The ILCS upgrade consisted of the replacement of the "Logic Coupler" LF equipment rack with a new equipment rack consisting of the Guidance and Control (G&C) Coupler, Message Processor with the KI-22, Keying-Variable module, the Control Monitor Drawer plus a power supply drawer. This equipment was state-of-the art back in the late 1970s... It was quite reliable based on my three (3) years of experience with ILCS testing. Salute to Boeing. 209.160.122.47 ( talk) 23:38, 25 June 2023 (UTC) reply