The Horizon Aircraft Company is preparing a contract proposal to submit to the Global Airlines Company for a new commercial aircraft, the JK60. Part of the proposal is a development and productions schedule for completion of the first aircraft. The project consists of three primary categories: (1) engine design and development; (2) development and production of the airframe (e.g., the aircraft body); and (3) the design and development of the aircraft avionics (e.g., the electronic systems, equipment, and other devices used to operate and control the aircraft). Following is a table listing the project activities with time estimates (in months).

Develop the project network, and determine the critical path, the expected project duration, and variance. What is the probability the project will be completed within 8years?

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Time Estimates Activity(days) Predecessor a m b Activi Description 1General design 2 Design engines 3 Airframe design 4 Avionics design 5 Develop test engine 6 Develop test airframe 6 10 24 20 35 60 5 17 33 6 9 15 7 12 17 Estimates Activity[days) Activity Activity Description Predecessor a m b 6 16 27 18 25 42 5,6,7 5 811 7Develop interim avionics 8 Engine development 9 Assemble test aircraft 10 Test avionics 11 Engine/airframe flight trials 12 Avionics flight trials 13 Engine production 14 Airframe production 15 Avionics production 16 Final assembly/Finish 2 5 10 13 10 15 18 11 14 21 11,12 12 16 26 13, 14,15 3 5 6