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66 -- FABRICATION OF A COMPOSITE OFF-AXIS ACHROMATIC ALL REFLECTING DESIGN TELESCOPE SOL 1-049-GLD.2044 DUE 051499 POC Joan Y. Crepps, Contracting Officer, Phone (757)-864-2521, Fax (757) 864-8863, Email J.Y.CREPPS@larc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/LaRC/date.html#1-049-GLD.2044. E-MAIL: Joan Y. Crepps, J.Y.CREPPS@larc.nasa.gov. This is an amendment to the synopsis entitled Fabrication of a Composite Off-Axis Achromatic All Reflecting Design Telescope, Solicitation No. 1-049-GLD.2044 which was posted on March 31, 1999. You are notified that the following clarifications/changes are made as a result of questions received. The questions and answers are as follows: 1. Q. Do the telescope and mirrors need to be manufactured from composite materials or does the word composite refer to the functionality of the telescope? A. The term "composite" is meant to signify the materials from which the telescope and it's mirrors are to be fabricated. 2. Q. Many items fabricated for LaRC are intended for aerospace use. These environments usually have masses, stiffness, and thermal requirements. What is the mass budget for the telescope? What is the fundamental frequency of the telescope assembly? What is the operating temperature of the telescope? A. Since the telescope is to be a demonstration of the viability of using composite materials for lightweighting telescopes for future remote sensing instruments, the environment will be laboratory ambient conditions. The mass budget is to be a best-effort approach, while maintaining stiffness specifications adequate to withstand a typical geostationary launch vehicle environment. Although the completed telescope is not expected to be demonstrated in this environment, the design shall be based on those conditions, i.e, temperatures ranging from 50 C to -1 C and the following qual-level vibration and shock environments: Frequency (Hz)20,80,1000,2000;g2/Hz 0.00125,0.02,0.02,0.01; Frequency 200,400,1400,1600,4000;g 29,113,113,150,150. The minimum fundamental frequency shall be kept above 50Hz. For information purposes, Code 5 Prescriptions are available upon request. For copies, contact Joan Y. Crepps, Phone (757) 864-2521, Fax (757) 864-8863, or e-mail j.y.crepps@larc.nasa.gov. Delivery date for telescope is changed from August 31, 1999 to December 31, 1999. The due date for receipt of offers is extended toMay 14, 1999. 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/LaRC Business Opportunities home page is http://procurement.nasa.gov/EPS/LaRC/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 04/23/99 (D-SN323778). (0113)

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