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