"Sensor not working. Violates the rules."<br /><br />right. there is 4 sensors and at least 2 must report to system for meco to be performed. so theoretically, 2 might do the job. in the past, before challenger i believe, lcc rules was 3 of 4 eco should be ok for launch. then they changed that criteria to 4 of 4. discovery was delayed for several month because of that. but now they are pushing atlantis with pump on 2 phases and 3 ecos out of 4. i heard, mmt meetings are hot.