Crew Size Scheduling Case.

A certain repair job, occuring at the average twice each year, requires one mechanic to spend eight hours on this job. Due to the critical nature of the equipment to be repaired, back-up machinery is required during the repair shot-down. The incurred rental cost of the back-up equipment is $ 50,00 per hour (the rental company charges minimum of four hours cost for such equipment usage).

Your job performance report file of this particular repair indicates that the single mechanic performing the repair is actually spending about 33% of the time on the main task (Net Work). The remainder of his work-time is spent on necessary or unavoidable Auxiliary Work related to repair such as,

receiving assignment, discuss with supervisor, locate the job, take measurements, make sketches (Planning),

receiving and/or complete material requisitions and materials, deliver to job, obtain supplies and tools (Organizing),

move between shop and job site, wait for elevators, transport materials (Coordinating), open and close switches, valves, test and document system data, provide job safety, move obstructions (Directing).

As alternative to the one man assignment, you consider the possibilities and relative merits of scheduling teams for the repair job.

Your analysis yields the crew sizes and net work ratios as either two-men crew at 40% or three-men crew at 30 % net work input for the mechanics performing the repair.

Based on the total job completion cost only, which of the three options appears the best, and what are the respective yearly costs of the three alternatives?

The hourly rate for the mechanics is $ 9,00 per hour including SWB. You need to use crew size scheduling table. Case number Number of staff Labor(n) Actual input(MAN HOUR) Core Task(Hypo)

Rental Cost