1. Introduction of Mode 5 / Mode S has led to many orders for the APX-123 as operators upgrade from older APX-H8 units and maintain compliance with the latest IFF standards 2. While orders supporting new-build aircraft will continue, major APX-123 retrofits will begin to wind down in 2024 3. The layout of the APX-H8/-123 IFF units is highly upgradable, and the family should see further updates as IFF protocols evolve.
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