Crew Size: 2
Components, timing and sequencing - all times are in weeks:
Components Time to Deliver Assembly Time Assembly Sequence
Canopy 2 1 To fuselage after instruments
Spinner 1 1 To engine after propeller
Rudder 3 1 To fuselage after stabilizer
Undercarriage 5 1 To fuselage before engine
Fuselage 8 12 Anytime
Stabilizer 3 1 To fuselage after wings
Engine 12 5 To fuselage
Propeller 10 1 To engine
Instruments 9 6 To fuselage
Wings 8 16 To fuselage
Cowling
4 1 To fuselage after engine
Use the Activity on the Arrow technique to diagram this project.
Mark the critical path.
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To diagram the project using the Activity on the Arrow technique, we will represent each activity as a node (represented by a circle) and the arrows between the nodes will represent the sequence of activities. The numbers on the arrows will represent the time it takes to complete each activity.
First, we identify all the activities and their durations:
Canopy: 2 weeks
Spinner: 1 week
Rudder: 3 weeks
Undercarriage: 5 weeks
Fuselage: 8 weeks (assembly time: 12 weeks)
Stabilizer: 3 weeks
Engine: 12 weeks (assembly time: 5 weeks)
Propeller: 10 weeks
Instruments: 9 weeks (assembly time: 6 weeks)
Wings: 8 weeks (assembly time: 16 weeks)
Cowling: 4 weeks
Based on the given assembly sequence, we can determine the order of activities:
1. Fuselage (8 weeks)
2. Wings (8 weeks)
3. Stabilizer (3 weeks)
4. Rudder (3 weeks)
5. Canopy (2 weeks)
6. Instruments (9 weeks)
7. Engine (12 weeks)
8. Propeller (10 weeks)
9. Spinner (1 week)
10. Cowling (4 weeks)
11. Undercarriage (5 weeks)
Now, let's create the diagram:
[Fuselage - 8]
/ \
[Wings - 8] [Stabilizer - 3]
/ \ |
[Rudder - 3] [Canopy - 2] [Engine - 12]
| | |
[Instruments - 9] [Propeller - 10]
|
[Cowling - 4]
|
[Spinner - 1]
|
[Undercarriage - 5]
To mark the critical path, we need to identify the longest path from the start node (Fuselage) to the end node (Assembly Complete). The critical path consists of activities that must be completed on time in order to prevent delays in the project.
In this case, the critical path is as follows:
Fuselage (8) -> Wings (8) -> Stabilizer (3) -> Canopy (2) -> Instruments (9) -> Engine (12) -> Propeller (10) -> Spinner (1) -> Cowling (4) -> Undercarriage (5)
Therefore, the critical path consists of activities with a total duration of 60 weeks. Any delay in these activities will directly impact the overall project timeline.