MANUFACTURING PROJECT/AIRCRAFT DEVELOPMENT PROJECT

MANUFACTURING PROJECT/AIRCRAFT DEVELOPMENT PROJECT

Project description
(a) Show the dependencies of the activities by completing the Predecessors column of Table 1.<br />
(b) Draw an activity-on-arrow (AoA) network diagram for the project, using node numberings 5, 10, 15, 20, etc.<br />
(c) Using the AoA diagram, carry out a critical path analysis and determine:<br />
• the earliest and latest event times,<br />
• the activity schedule times (earliest and latest starting times, earliest and latest finishing times, and total float) for each activity<br />
• the critical path and project completion time.<br />
(c) Using Excel, draw a Gannt chart for the project. Show the float for each activity and the critical path on the chart.<br />
(d) Discuss how the project manager would use the activity floats in controlling the execution of the project.<br />
(e) Draw the resource chart assuming that each activity requires one team, and carry out resource levelling as much as possible.

University of Salford School of Computing, Science & Engineering

BEng (Hons) in Civil Engineering Foundation Year
BEng (Hons) Aeronautical Engineering Foundation Year
BEng (Hons) Mechanical Engineering Foundation Year

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PROJECT MANAGEMENT S0.2

ASSESSMENT 3 –ASSIGNMENT

THIS ASSESSMENT WEIGHS 50% OF THE MODULE MARK

DATE ISSUED: 17 MARCH 2014
DATE DUE: 21 APRIL 2014 (4:00PM)

SUBMISSION IN ELECTRONIC FORM VIA BLACKBOARD

ANSWER BOTH QUESTIONS

1. MANUFACTURING PROJECT

In the manufacture of a piece of apparatus, the final assembly (which has to be tested by a piece of specially made test gear) is made up of two items:

(1) Component 4.
(2) Sub- assembly B.

The second assembly in turn is made up of two items:

(1) Component 3.
(2) Sub- assembly A.

The first assembly is made up of two parts:

(1) Component 1.
(2) Component 2.

To manufacture these components special machines must be obtained as follows:

Machine A: produces component 1
Machine B: produces component 2
Machine C: produces components 3 and 4

Each component is tested before it is assembled with another component or item, but test gear can be assumed to be available for all testing except final testing for which special test gear has to be made. The design of this special test gear is known at the outset of the project. The activities involved in the project are listed in Table 1.

Table 1 Activities of manufacturing projct
Activity Activity description Duration
(days) Predecessors
A Obtain Machine A 2
B Obtain Machine B 3
C Obtain Machine C 2
D Make component 1 2
E Make component 2 2
F Make component 3 3
G Make final test gear 20
H Test component 1 3
I Test component 2 4
J Test component 3 3
K Make Sub- assembly A 3
L Test final assembly 5
M Make component 4 8
N Test component 4 20
P Make Sub- assembly B 7
Q Make final assembly 3

(a) Show the dependencies of the activities by completing the Predecessors column of Table 1.
(b) Draw an activity-on-arrow (AoA) network diagram for the project, using node numberings 5, 10, 15, 20, etc.
(c) Using the AoA diagram, carry out a critical path analysis and determine:
• the earliest and latest event times,
• the activity schedule times (earliest and latest starting times, earliest and latest finishing times, and total float) for each activity
• the critical path and project completion time.
(c) Using Excel, draw a Gannt chart for the project. Show the float for each activity and the critical path on the chart.
(d) Discuss how the project manager would use the activity floats in controlling the execution of the project.
(e) Draw the resource chart assuming that each activity requires one team, and carry out resource levelling as much as possible.
2. AIRCRAFT DEVELOPMENT PROJECT

An aircraft manufacturer is ready to begin a project to develop a new fighter aircraft for the Defence Department . The company’s contract calls for project completion within 100 weeks, with penalties imposed for late delivery.

The project involves 10 activities labelled A, B, . . . , J whose predecence relationships are shown in Figure 1.

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Table 2 shows the usual PERT three time estimates of the duration of each activity.

Activity
Time estimates (weeks)
Optimistic Most likely Pessimistic
A 28 32 36
B 22 28 32
36 26 36 46
D 14 16 18
E 32 32 32
F 40 52 74
G 12 16 24
H 16 20 26
I 26 34 42
J 12 16 30

(a) Calculate the expected time and variance for each activity, using PERT methodology, and carry out a critical path analysis using the calculated expected times. Hence, identify the critical path and estimate the duration of the project.
(b) Using Excel, draw an AoN network diagram of the project, showing the EST, LST and Total Float on the diagram.
(c) What is the probability of completing the project within 100 weeks?

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