Electro Fans has just received an order for one thousand 20-inch fans due week 7. Each fan consists of a housing assembly, two grills, a fan assembly, and an electrical unit.

The housing assembly consists of a frame, two supports, and a handle. The fan assembly consists of a hub and five blades.

The electrical unit consists of a motor, a switch, and a knob.

The following table gives lead times, on-hand inventory, and scheduled receipts.

a) Construct a product structure.

b) Construct a time-phased product structure.

c) Prepare a net material requirements plan.

Data Table for Problem 14.13 COMPONENT LEAD TIME ON-HAND INVENTORY LOT SIZE*

SCHEDULED RECEIPT 20” Fan 1 100 —

Housing Frame Supports (2)

Handle 1

2 1

1 100

—

50 400

—

—

100 500 Grills (2) 2 200 500 Fan Assembly Hub Blades (5)

3 1

2 150

—

—

—

—

100 Electrical Unit Motor Switch Knob 1

1 1

1

—

—

20

—

—

—

12 25 200 knobs in week 2

* Lot-for-lot unless otherwise noted.