The down time statistics are based on individual fault reports. In Table 1 I give the general down time statistics for period 36. A total of 74 fault reports were submitted, with an average time lost of 14 min per fault, for a total down time of 0.8% (1.1% on scheduled observing nights). Of these, 47 reported no time lost, 24 reported 2 hrs lost, and 3 reported 2 or more hrs lost.
|Night included||Time lost||Nights||Percentage||Last semester||Last winter|
|All nights||1030 min||183||0.8%||1.4%||0.7%|
|Scheduled observing nights||975 min||127.5||1.1%||1.8%||0.8%|
|Technical nights||55 min||20.5||0.4%||1.1%||0.3%|
|Service nights||260 min||35||1.1%||2.6%||0.6%|
|Visitor instruments||0 min||14||0.0%||0.1%||0.0%|
|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 1.4% (1.8% on scheduled observing nights) in period 35 and 0.7% over all nights (0.8% on scheduled observing nights) in period 34. Of the 118 fault report in period 35, 80 reported no time lost, 34 reported 2 hrs lost, and 4 reported 2 or more hrs lost. Of the 117 fault report in period 34, 82 reported no time lost, 35 reported 2 hr lost, and none reported 2 or more hrs lost.
Apart from the continuously low down time, the only thing to notice is the relatively low number of fault reports during the last semester.