On average it is necessary to assign:
• 2 diesel fitters (1 certified plus 1 apprentice) to motor repairs
3
• 2 mechanical fitters (1 certified plus 1 apprentice) to mechanical repairs
• 1 boilermaker/welder to structural repairs
• 1 mechanical fitter to PMs, accessories and miscellaneous repairs
• 1 electrician to electric repairs
If (a) the mine works 12 hour shifts on a 8×6 panel roster (8 days on followed by 6 days
off, with FIFO travel time included in the 8 days) (b) each worker is entitled to 4 weeks
leave per year and (c) average time-on-tools (worker efficiency) is 45%:
(xvii) Calculate the number of diesel fitters, mechanical fitters and electricians
necessary to maintain the fleet of 49 trucks. (3 marks)
(xviii) If the span of control is 1 supervisor to 8 maintenance workers, calculate the
number of supervisors that the mine will need to hire. (2 marks)