The purpose of this thesis is to identify and investigate reference times for regularmaintenance work activities at the department responsible for maintenance ofunderground loaders at company LKAB:s mine in Kiruna, Sweden. The study is athesis of 15 credits at Uppsala University and has been carried out over 10 weeksduring the spring 2016. The majority of the work has been carried out on site. For a long time the underground loaders department has been struggling withrecurring breakdowns. Which affect the production in the mine and is a burden forthe maintenance personal. To live up to the expectations of the customer and be ableto plan the work procedures with better precision the department now wants to geta better picture of how much the planning of the maintenance work affects thedepartment, both in time and costs. The goal with the study is to proposeimprovements of how to minimize the time for maintenance work. The study has looked at internal statistics from 2015 and used it to map out whichactivities that have the biggest influence on the department. The first selectionresulted in six procedures which are carried out on the two types of loaders from SANDVIK that the company uses. The chosen activities are bucket replacement, tiltcylinder replacement, lift cylinder replacement and front and rear axle replacement.Due to the limitation of time for the study one of these six activities were chosen fora deeper analysis. The choice, after discussion with the mentor Sandy Doull at LKAB,fell on front and rear axle replacement. The conclusion after the study is that there are big opportunities for improvementsfor the department responsible for the underground loaders at LKAB. Workingactively with follow ups and implementing the Lean tool 5S they can reduce waste,variation and to improve productivity for all the work procedures. Improvements thatcould lead to big economic profits by reducing downtime in production and improveworking conditions for maintenance personal during the work procedures.

<p>Syftet med uppsatsen är att undersöka, jämföra och diskutera eventuella faktorer till varför det har skett en så kraftig ökning av helikopterhaverier under de senaste tio åren jämfört med stridsflygshaverier. Problemet belyses och analyseras utefter ett MTO- perspektiv (människa, teknik och organisation). Stor vikt i uppsatsen läggs på de haverirapporter som är en följd av haverier mellan 1997 – 2007. Organisationsförändringar, flygmaskiner och utbildning är exempel på några andra delar som också behandlas. Viktigaste slutsatserna med uppsatsen är att helikopterhaverierna till stor del berott på den mänskliga faktorn medan stridsflyget har haft mer varierande orsaker. Faktorer som kan ha påverkat så att helikopterhaverierna har ökat jämfört med stridsflygshaverierna är följande tre.- Sammanslagningen av armeflyget, marinflyget och helikopterverksamheten i Flygvapnet.- Att flygning med helikopter i större omfattning sker på låg höjd.- Fler personer i en besättning kan påverka flygningen.</p> / <p>The purpose of this essay is to investigate, compare and discuss possible factors that have contributedto the big increase in helicopter crashes in the last ten years compared to fighter jets. The problem is looked upon and analyzed from an HTO perspective (human, technology and organisation). A lot of the essay is focused on the investigation reports that has followed all crashes between 1997-2007. Organisational change, different aircrafts and education and training are examples of other factorsthat are discussed in the essay. The most important conclusions that have been drawn are that helicopter crashes are mostly due to human factors reasons. Fighter jet crashes have more variation in the causes. Factors that may have been contributing in increasing helicopter crashes compared to fighter jets are:- The fusion between the army, marine and air force helicopter units- Helicopter flying is more frequently done on a lower altitude- There are more people part of the helicopter crew which can affect the flight</p>

Syftet med uppsatsen är att undersöka, jämföra och diskutera eventuella faktorer till varför det har skett en så kraftig ökning av helikopterhaverier under de senaste tio åren jämfört med stridsflygshaverier. Problemet belyses och analyseras utefter ett MTO- perspektiv (människa, teknik och organisation). Stor vikt i uppsatsen läggs på de haverirapporter som är en följd av haverier mellan 1997 – 2007. Organisationsförändringar, flygmaskiner och utbildning är exempel på några andra delar som också behandlas. Viktigaste slutsatserna med uppsatsen är att helikopterhaverierna till stor del berott på den mänskliga faktorn medan stridsflyget har haft mer varierande orsaker. Faktorer som kan ha påverkat så att helikopterhaverierna har ökat jämfört med stridsflygshaverierna är följande tre.- Sammanslagningen av armeflyget, marinflyget och helikopterverksamheten i Flygvapnet.- Att flygning med helikopter i större omfattning sker på låg höjd.- Fler personer i en besättning kan påverka flygningen. / The purpose of this essay is to investigate, compare and discuss possible factors that have contributedto the big increase in helicopter crashes in the last ten years compared to fighter jets. The problem is looked upon and analyzed from an HTO perspective (human, technology and organisation). A lot of the essay is focused on the investigation reports that has followed all crashes between 1997-2007. Organisational change, different aircrafts and education and training are examples of other factorsthat are discussed in the essay. The most important conclusions that have been drawn are that helicopter crashes are mostly due to human factors reasons. Fighter jet crashes have more variation in the causes. Factors that may have been contributing in increasing helicopter crashes compared to fighter jets are:- The fusion between the army, marine and air force helicopter units- Helicopter flying is more frequently done on a lower altitude- There are more people part of the helicopter crew which can affect the flight