Recently, Phil Harris, the preduction control manager at Brunswick read an article on time-phased requirements planning. He was cunous about how this technique might work in scheduling Brunsick's engine assembly operations and decided to prepare an example to ilustrate the use of time phased requirements planning Phil's first step was to prepare a master schedule for one of the engine types produced by Brunswick the Model 1000 engine. This schedule indicates the number of units of the Model 1000 engine to be assembled cach week during he last 12 weeks and is shown on the next page. Next, Phil decided to simplify his requirements planning example by sidering only hwo of the many components that are needed to complete the assembly of the Model 1000 engine These two components, the gear box and the input shart, are shovn in the product structure diagram shown below. Phil noted that the gear box is assembled by the Subassembly Department and subsequently is sent to the main engine assembly line The input shaft is one of several component parts manufactured by Brunswick that are needed to praduce a gear box subassembly Thus, levels 0, 1, and 2 are included in the product structure diagram to indicate the three manufecturing slages thal are ivolved in producing an engie. the Engine Assembly Depertmen, he Subassembly Depertmert, and he Machine Shop The manufacturing lead times required to produce the gear box and input shaft components ere also indicated in the bill-of-material diegram. Note that two weeks are required to produce a batch of gear baxes and that eall the gear boxes must be delivered to the assembly line parts stockroom before Monday morning of the week in which they are to be used. Likewise, it takes three weeks to produce a lot of input shafts, and all the shafts that are needed for the production of gear boxes in a given week must he delivered to the Subassembly Department stockroom before Monday morning of that week In preparing the MRP example Phil planned to use the worksheets shown below and to make the following assumptions: 1 Twenty gear boxes are on hand at the beginning of Week 1, and six gear boxes are currently on order to be delivered at the start of Week 2. 2 Forty input shefts are on hand at the start of Week 1, and 24 are scheduled for delivery at the beginning of Week 2