NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

A -- MMC COMBUSTION CHAMBER DEMONSTRATION UNIT SOL 8-1-9-RA-23203 DUE 051499 POC Teresa A. Foley, Contracting Officer, Phone (256) 544-0335, Fax (256) 544-4080, Email teresa.foley@msfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/MSFC/date.html#8-1-9-RA-23203. E-MAIL: Teresa A. Foley, teresa.foley@msfc.nasa.gov. This is an amendment to the synopsis entitled MMC Combustion Chamber Demonstration Unit which was posted on April 28, 1999. This notice serves as the official amendment to subject synopsis and a written amendment will not be issued. The purpose of this amendment is to provide an official response to questions received. Question 1 Will MSFC furnish the copper alloy liner including the coolant channels? Answer: MSFC will provide the copper alloy liner with the coolant channels already machined. Question 2 Is there a specification of the manifolds with respect to location on the copper liner, size length, etc? Answer: To properly cool the liner the completed unit must include an inlet manifold located at the aft end of the unit and an outlet manifold located at the forward end of the unit. In addition, the forward end of the unit must include an appropriate flange for mounting the hardware to the supporting test hardware. There are no specifications available for the manifold sizes. The mounting flange will include 8-10 bolt holes for proper installation to the test facility hardware, but no additional dimensions are available at this time. Question 3 What is the aluminum alloy desired for the MMC, the reinforcement (particles or fiber), architecture of the reinforcement, volume loading, any directional or isotropic properties, etc. What thickness is desired for the MMC, hoop strength, X, Y, & Z strengths, modulus, etc. What thermal conductivity is desired in the MMC and its isotropy? Answer: Primarily MSFC is interested in a structural jacket fabricated with aluminum silicon carbide or boron carbide. There are no specifications available for thickness, hoop strength, etc. There is no desired thermal conductivity, although the completed unit must successfully handle the heat loads generated by the specific test conditions and maintain a successful bond between the structural jacket and the liner. The contractor must perform appropriate analyses to justify their chosen materials and design. Question 4: Cana drawing or sketch be made available for the copper piece as well as the desired completed fabricated unit? Answer: Attached is a powerpoint sketch of preliminary dimensions of the copper liner. Included also is a simple sketch of the completed unit. Documents related to this procurement are available over the Internet and are in Microsoft Office Suite (Word 6.0, Excel 5.0, or PowerPoint 4.0) format and will 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/MSFC Business Opportunities home page is http://procurement.nasa.gov/EPS/MSFC/class.html. Offerors are responsible for monitoring this site for the release of the solicitation and any amendments. Potential offerors are responsible for downloading their own copy of the solicitation and amendments (if any). Posted 05/10/99 (D-SN329456). (0130)

Loren Data Corp. http://www.ld.com (SYN# 0002 19990512\A-0002.SOL)