Genomgång av A-checkupplägg till Dash 8 Q400
In this report I summarize the thesis, which is about to check what will happen if you decide to increase the interval between the a-checks, carried out on the Norwegian airline Widerøe. They want to know if an increase in time between the checks can give them an opportunity of increasing their aircraft fleet. In the current situation Widerøe has 11 Dash 8 Q400 and can consider a possible increase of 3 planes. This would be done without the need to increase accessibility of the hangars and increase in staff.What determines how often a check is performed is the maintenance tasks which has the shortest maintenance interval. On the Dash 8 the shortest interval is 600 flight hours. Therefore, a check must be performed once every 600 flight hour.But since there is so many maintenance tasks that will be performed at every check point, Widerøe have decided to divide their checks. They do this by dividing every check-package into four smaller packages. With this layout they get a breakdown of 150 flight hours instead of 600, and so you get less time between maintenance and fewer maintenance tasks at each occasion.My work started by developing a new checking package of 600 flight hours of interval. I did this by merging the existing check-package of 150 flight hour intervals into a checking package with 600-hour intervals. After that, it took considerable amount of work to define the differences between the various check packages. I started to count on whether you saved or not saved time by lengthening the interval. After that I optimized the number of technicians needed at each check and then calculated the total time required for each check.In the end I came up with two possible solutions. The first option is to use my check program with 600 flight hours of interval, and then increase the fleet with two aircrafts. The second option is to use a checking program with 300 flight hours of interval and then increase the fleet with one aircraft.