Sources Sought DEPT OF DEFENSE DEPT OF THE AIR FORCE is seeking potential vendors for an engineering services effort regarding the B-2 ZSR Band 2 Antenna, RH Upper. This antenna is part of the B-2 DMS subsystem for receive and transmit functions and forms a portion of the outer mold line. The purpose of this effort is to resolve obsolescence, develop, and qualify a sustainable configuration for manufacturing. Potential vendors must be capable of evaluating the BOM, identifying obsolete parts and materials, proposing alternatives for long-term sustainment, maintaining LRU form, fit, and function, meeting specification requirements, addressing testing requirements, and developing a Technical Data Package. Northrop Grumman is currently the only known source with qualifications for this effort. Vendors must demonstrate capabilities and past performance in low observable applications, B-2 aircraft antenna repair and manufacturing, B-2 aircraft integration and environmental testing, maintaining a quality system, and meeting security clearance requirements. Small businesses may be eligible for a set-aside portion of the requirement. Large businesses should submit subcontracting opportunities for small businesses.