NASA/Lewis Research Center, 21000 Brookpark Road, Cleveland, OH 44135

A -- HALL THRUSTER DEVELOPMENT SOL RFO3-114549 DUE 012999 POC Glen M. Williams, Contracting Officer, Phone (216) 433-2885, Fax (216) 433-2480, Email Glen.M.Williams@lerc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/LeRC/date.html#RFO3-114549. E-MAIL: Glen M. Williams, Glen.M.Williams@lerc.nasa.gov. THIS NOTICE CONSTITUTES AMENDMENT NO. 1 TO THE COMBINED Synopsis/RFO FOR HALL THRUSTER DEVELOPMENT SUPPLEMENTED WITH ADDITIONAL INFORMATION CONTAINED IN THIS NOTICE. Companies shall acknowledge all amendment(s) in their offer. This notice serves as the official amendment to the subject solicitation and a written amendment will not be issued. The purpose of this amendment is to provide answers to questions asked about the procurement]. The due date for receipt of offers is not extended. 1. Can NASA provide baselines or more quantitative requirements for mass and recurring costs for SOA ion thrusters? NASA is requesting proposals that provide the best value with regard to all the evaluation criteria. 2. Is it correct to assume tht the ISP requirement of 3200 seconds accounts for both anode and cathode propellant flows? Yes. 3. For life validation, does NASA require 8000 hours of testing of one engine, 1.5 times 8000 hours on one engine, or just enough testing with reasonable extrapolation to 8000 hours? Whatever the offeror's proposal deems to be of best value to NASA in order to meet the objectives of the program. NASA will evaluate proposals in regard to the meeting of program objectives yet providing the best value to NASA. 4. Over what power range should HET power be throttled? Whatever power level the offeror's proposal deems to be important for NASA's intended use. The intended use is for future space science missions and NASA will evaluate proposals against its intended use and the best value criteria. 5. What variable thrust range is desired at constant power? There are no specific requirements with regard to variable thrust at constant power. Note that innovation and flexibility of design is a best value criteria used for evaluation. 6. Are there preferred power levels? 2.3 KW and any other power level the offeror's proposal deems important for NASA's intended use. 7. Is the minimum requirement of 3200 sec ISP at 2.3 KW also required over the throttled power range? There are no specific requirementswith regard to specific impulse at off-design points. Note that innovation and flexibility of design is a best value criteria used for evaluation. 8. Is the propellant management assembly to be an engineering model or a breadboard type design? Engineering model 9. How developed and integrated should the PMA be? The exent of PMA development and integration will be that deemed necessary by the offeror's proposal and NASA will evaluate it against the best value criteria. 10. What are the costs of using existing Government facilities and how should this be handled for proposal preparation? The offeror shall clearly state what Government faciltites, if any, it requires to use but do NOT add any cost estimate for their use in the offeror's proposal. Costs for use of Government facilties range from $50 to $250 per hour of operation not including any engineering, technical support, xenon, powersupplies, harnesses, etc. The actual cost can not be estimated without all the specific information of the offeror's proposed testplans (which shall be part of their proposal). The Government will then figure these costs and use them in determining the overall cost to the Government for the effort cited in the offeror's proposal. Documents related to this solicitation will be available over the Internet. These documents are in Microsoft Office Suite (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The WWW address or URL of the NASA/LeRC Business Opportunities home page is http://procurement.nasa.gov/EPS/LeRC/class.html. Posted 12/28/98 (D-SN283627). (0362)

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