The down time statistics are based on individual fault reports. In Table 1 I give the general down time statistics for period 37. A total of 95 fault reports were submitted, with an average time lost of 19 min per fault, for a total down time of 1.8% (0.1% on scheduled observing nights). Of these, 63 reported no time lost, 28 reported 2 hrs lost, and 4 reported 2 or more hrs lost.
|Night included||Time lost||Nights||Percentage||Last semester||Last summer|
|All nights||1785 min||183||1.8%||0.8%||1.4%|
|Scheduled observing nights||610 min||146||0.1%||1.1%||1.8%|
|Technical nights||60 min||21||0.1%||0.4%||1.1%|
|Service nights||60 min||16||0.1%||1.1%||2.6%|
|Visitor instruments||1115 min||31||6.8%||0.0%||0.1%|
|Taking the average length of time within nautical twilight. Exact numbers for each night|
|are used when looking at ``All nights''|
|Excluding technical nights and visitor instruments|
|Excluding service nights with SOFIN|
This compares to a down time of 0.8% over all nights (1.1% on scheduled observing nights) in period 36, and 1.4% over all nights (1.8% on scheduled observing nights) in period 36. Of the 74 fault report in period 36, 47 reported no time lost, 24 reported 2 hrs lost, and 3 reported 2 or more hrs lost. Of the 118 fault report in period 35, 80 reported no time lost, 34 reported 2 hr lost, and 4 reported 2 or more hrs lost.
Although the total down time is slightly higher than in previous semesters, being completely dominated by a single fault, the overall numbers are rather normal.