Car Age (yr.) Annual Maintenance Cost 0 1 $ 3,000 4,500 Used Selling Price $ 15,000 2 6,000 12,000 3 8,000 8,000 4 11,000 4,000 5 14,000 2,000 6 0 Activity Activity Description 1 General design 2 Engine design 3 Airframe design 4 Avionics design 5 Develop test engine 6 Develop test airframe 7 Develop interim avionics 8 Develop engine 9 Assemble test aircraft 10 Test avionics 11 Conduct engine/airframe flight trials 12 Conduct avionics flight trials 13 Produce engine 14 Produce airframe 15 Produce avionics 16 Final assembly/finish Activity Predecessor a Time Estimates (mo.) m b 5 10 22 20 33 : 57 1 6 17 33 1 2 8 20 2 7 10 12 3 8 11 18 4 7 15 28 2 19 24 41 5,6,7 4 6 10 4 5 10 16 9 5 9 12 10 5 9 24 8 11 14 15 11 12 15 20 11, 12 14 16 25 13, 14, 15 2 3 5