Down Time

The down time statistics are based on individual fault reports. In Table 1 I give the general down time statistics for period 48.

A total of 65 fault reports were submitted, with an average time lost of 7 min per fault, for a total down time of 0.4% (0.4% on scheduled observing nights). Of these, 40 reported no time lost, 25 reported $<$ 2 hrs lost, and none reported 2 or more hrs lost.

This compares to a down time of 1.0% over all nights (1.0% on scheduled observing nights) in period 47, and 0.4% over all nights (0.4% on scheduled observing nights) in period 46. Of the 69 fault report in period 47, 48 reported no time lost, 22 reported $<$ 2 hrs lost, and one reported 2 or more hrs lost. Of the 94 fault reports reported in period 46, 68 reported no time lost, 26 reported $<$ 2 hrs lost, and none reported 2 or more hrs lost.

Table 1: Technical down time statistic period 48: 2013-10-01 to 2014-04-01

Night included	Time lost	Nights	Percentage$^a$	Last semester	Last Winter
All nights	450 min	182	0.4%	1.0%	0.4%
Scheduled observing nights$^b$	405 min	152	0.4%	1.0%	0.4%
Technical nights	45 min	21	0.3%	0.4%	0.5%
Service nights$^c$	110 min	38	0.4%	3.2%	0.7%
Visitor instruments	0 min	9	0.0%	0.5%	0.0%
$^a$ Taking the average length of time within nautical twilight. Exact numbers for each night
are used when looking at ``All nights''
$^b$ Excluding technical nights and visitor instruments
$^c$ Excluding service nights with SOFIN

Both the downtime and the number of fault reports were very low this semester, the latter being at an all time low.