The FAA intends to award a single-source contract to United States Technologies Inc. for ARSR-4 RF Transfer Switches to replenish serviceable stock levels for the ARSR-4 Radar System. This procurement follows a 2022 development of a form-fit replacement unit, with the goal of supporting 44 operational sites plus additional spares. The work supports the Mike Monroney Aeronautical Center, though no specific performance location is stated. No budget amount is specified in the notice. Questions must be submitted in writing by 3pm on Friday, 24 July 2026.