Down Time

The down time statistics are based on individual fault reports. In Table 1 I give the general down time statistics for period 46.

A total of 94 fault reports were submitted, with an average time lost of 5 min per fault, for a total down time of 0.4% (0.4% on scheduled observing nights). Of these, 68 reported no time lost, 26 reported $<$ 2 hrs lost, and none reported 2 or more hrs lost.

This compares to a down time of 0.3% over all nights (0.3% on scheduled observing nights) in period 45, and 0.9% over all nights (1.1% on scheduled observing nights) in period 44. Of the 86 fault report in period 45, 69 reported no time lost, 17 reported $<$ 2 hrs lost, and none reported 2 or more hrs lost. Of the 130 fault reports reported in period 44, 95 reported no time lost, 33 reported $<$ 2 hrs lost, and 2 reported 2 or more hrs lost.

Table 1: Technical down time statistic period 46: 2012-10-01 to 2013-04-01

Night included	Time lost	Nights	Percentage$^a$	Last semester	Last Winter
All nights	507 min	182	0.4%	0.3%	0.9%
Scheduled observing nights$^b$	407 min	140	0.4%	0.3%	1.1%
Technical nights	100 min	28	0.5%	0.4%	0.3%
Service nights$^c$	235 min	53.5	0.7%	0.7%	1.7%
Visitor instruments	0 min	14	0.0%	0.0%	0.3%
$^a$ 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

Although higher than in the last semester, all the numbers are still at a very low level.