8442-88 Page 12 2012.07.06 Motor Failure During Commissioning Mitigating Considerations Calculations of required motor use in baseline commissioning plan assume all degrees of freedom are used to best-optimize telescope performance Utilizing only PMSA strong degrees of freedom (despace/tilt) still provides compensation of low-order system errors with minor degradation to performance If a motor were to fail or if there was concern over a particular motor, decision could be made to only use strong degrees of freedom Current plan corrects strong degrees of freedom during the first iterations of Global Alignment and saves the weak degrees of freedom for later in the process Most significant corrections made earlier in motor life If SMA (needed for Global Alignment sensing) has motor failure during the process, lesser impact to not iterating through global alignment to correct weak degrees of freedom
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