NASA/Goddard Space Flight Center, Code 287 Greenbelt, MD

A -- COARSE SOLAR SENSORS SOL RFP5-16826/238 POC DARLENE WALTER, CONTRACTING OFFICER, (301)286-4239. Coarse Solar Sensors. NASA/Goddard Space Flight Center (GSFC) intends to issue a Request for Proposal (RFP)5-16826/238 on a sole source basis to Adcole Corporation for all the necessary personnel, facilities, and materials to fabricate and test 24 Coarse Solar Sensors (CSS) for spaceflight use with options for up to 24 additional CSS units. The CSS units will interface with the Attitude Control Electronics (ACE) and be used for payload attitude control for the TRACE and WIRE Small Explorer (SMEX) missions. The Attitude Control and Stabilization Branch/Code 745 is currently utilizing Adcole CSS units in the SMEX attitude control system design. The initial procurement of this particular device was in 1990 under contract NAS5-31261 with delivery beginning in 1991. As a result of the selection of the TRACE and WIRE missions, two new attitude control systems are required for these spacecraft. The attitude control systems require identical devices which must meet the current specification to provide the same form, fit, and function, withstand a minimum total dose of electron and proton bombardment of 100 K rad, and be electrically and mechanically interchangeable with the existing units. This requires that the mechanical envelope, weight, power, transfer functions, electrical interface, and thermal properties be identical to the original units to avoid the costly re-design of the attitude control software, the ACS dynamic simulator software, and all associated component, subsystem, and spacecraft level procedures. Since both TRACE and WIRE are on an extremely tight schedules, the flight qualified CSS units must be delivered within 18 months of contract award. Over the past 25 years, Adcole Corporation has designed, fabricated, tested, and delivered numerous sun sensors for spaceflight use to various customers. As a result of these efforts, Adcole Corporation has furthered its unique capabilities in the field of digital sun sensors. Furthermore, this requirement is a continuation of the existing NASA SMEX effort and requires extensive knowlege of the previous work performed. Adcole Corporation is the only company that can provide CSS units capable of meeting the specifications without significant development time and cost, which would impact both the TRACE and WIRE schedules. Adcole Corporation is considered uniquely qualified under the statutory authority of 10 U.S.C. 2304 (C)(1), only one responsbile source. Any persons desiring consideration are requested to fully identify their interest and capabilities within fifteen (15) days of the publication of this synopsis to the GSFC Contracting Officer listed above. See Note(s): 22. (0129)

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