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ACTIVITY TITLE: Thermal Verification ID: TCS-01 APPLICABLE REQUIREMENTS: L.10.4.13.1 DESCRIPTION: The determination of the impact of NOBL

installation is expected to be ongoing for Bays 5, 7 and 8, likely through and past the SMOV period. The Bay 5 and 8 temperatures will be monitored after NOBL installation for a preliminary determination of impacts. Bay 7 impacts are expected to be small, perhaps visible during trending. Bays 5 and 8 are expected to have greater impact following successful installation of the NOBL-ER. Since the changes are not expected to have critical impacts, no specific thermal verification is really warranted for the SMOV period. Typically the verification of heater systems and thermal impacts is done on an ongoing basis, and not tied to the SMOV period, because there are no HST verification periods dedicated to remaining at certain attitudes and equipment configurations for thermal verification. Further correlation of the thermal model beyond the current levels (well correlated to flight data) does not seem critical enough to warrant taking the 2-3 days of stable HST configuration needed for additional correlation data. IMPLEMENTATION METHOD: HST temperatures are trended periodically, catching the cold and hot environments as they occur in the science mission schedule. Since trending prior to and post SM4 will be done to determine any thermal changes to the vehicle, a specific on-orbit engineering test (i.e., stable thermal conditions for 2 to 3 days) is not required. DEPENDENCIES: Installation of one or more NOBLs.


DURATION: Through and past the SM4/SMOV period. DATA REQUIREMENTS: Routine engineering data. ANALYSIS & EXPECTED RESULTS: Understanding of the effects of the NOBL(s) on HST thermal characteristics. COMMENTS: N/A AUTHOR/ORG/TEL #/E-MAIL: J. Abel/HST Thermal Systems LMMS/(240) 684-1181/jabel@hst.nasa.gov

DATE: January 25, 2008