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Chapter 7 - a model developed in a company of the production field and maintenance radar.

7.1.7 Second modification for technical reasons.

To the light of the actions undertaken in the last case, Notes that are two LRU, the LRU 37 and LRU 38, for which it is believed to make a redesign partial is for members FR=5 who FR=6; for the reasons already it mentions to you in Par. 7.1.5, has been believed to in the event estimate the resolution costs total of redesign total of the LRU.
In the successive tables it comes brought back a synthesis of the actions to undertake for the LRU interested from members with FR=6 and FR=5.

LRU with members characterizes to you from FR=6.

 

Nome LRU

Critical types

Population

Critics

Fabbisogno19

Action

CostoLB/CostoRD

 

LRU 50

4

95

1

LB

2,20%

 

LRU 24

3

4

1

LB

1,52%

 

LRU 19

7

13

1

LB

9,33%

 

LRU 25

2

3

1

LB

0,66%

 

LRU 26

4

8

1

LB

12,14%

 

LRU 49

9

54

1

LB

32,95%

 

LRU 29

2

4

1

LB

1,31%

 

LRU 20

3

10

5

LB

1,74%

 

LRU 41

3

6

1

LB

1,55%

 

LRU 52

3

8

1

LB

2,63%

 

LRU 33

9

30

1

LB

2,19%

 

LRU 51

4

8

1

LB

2,23%

 

LRU 18

4

37

1

LB

39,18%

 

LRU 45

2

11

1

LB

1,12%

 

LRU 3

2

3

41

LB

0,81%

 

LRU 8

1

4

1

LB

0,05%

 

LRU 40

3

4

1

LB

0,48%

 

LRU 7

2

3

5

LB

9,57%

 

LRU 23

3

18

1

LB

21,75%

 

LRU 5

3

6

3

LB

11,82%

 

LRU 35

1

1

1

LB

0,01%

 

LRU 30

2

5

1

LB

1,25%

 

LRU 53

2

3

1

LB

2,98%

 

LRU 37

6

44

17

RD TOTAL

107,65%

 

LRU 38

6

29

30

RD TOTAL

82,91%

 

LRU 36

6

28

1

RD

90,41%

 

LRU 31

6

31

1

LB

2,79%

 

LRU 32

6

28

1

LB

1,10%

 

LRU with members characterizes to you from FR=5.

Nome LRU

Critical types

Population

Critics

Fabbisogno19

Action

LB/RD

LRU 2

1

4

3

LB

0,01%

LRU 50

6

22

1

LB

0,45%

LRU 24

2

2

1

LB

0,80%

LRU 19

3

3

1

LB

0,11%

LRU 26

2

2

1

LB

0,01%

LRU 49

5

9

1

LB

0,09%

LRU 29

3

3

1

LB

0,07%

LRU 20

11

32

4

LB

10,84%

LRU 41

5

7

1

LB

0,04%

LRU 52

6

14

1

LB

1,19%

LRU 33

8

19

1

LB

1,05%

LRU 54

2

3

1

LB

0,28%

LRU 51

6

9

1

LB

2,77%

LRU 18

9

47

1

LB

0,06%

LRU 3

14

23

39

LB

4,17%

LRU 6

8

17

3

LB

9,09%

LRU 8

4

13

1

LB

4,05%

LRU 40

14

31

1

LB

0,59%

LRU 4

2

6

27

LB

1,59%

LRU 7

2

2

5

LB

0,81%

LRU 23

8

25

1

LB

0,04%

LRU 5

3

6

3

LB

0,15%

LRU 35

2

2

1

LB

0,07%

LRU 30

4

4

1

LB

1,54%

LRU 53

10

30

1

LB

4,69%

LRU 37

13

26

16

RD TOTAL

147,14%

LRU 38

10

21

29

RD TOTAL

165,79%

LRU 36

1

6

1

LB

0,02%

LRU 31

4

11

1

LB

0,96%

LRU 32

6

25

1

LB

5,71%

Table 7.4: Resolutive actions for the second modification for technical reasons.

The relative cash flows you to the case base, considering such redesign totals, are brought back in the brought back diagram under (for the values send back to the appendix B pag. 159).


Figure 7.14: Cash flows case second base modification for technical reasons.

Also in this case, for the reasons esplicitate in Par. 7.1.5, it is necessary to consider, in the costs for the resolution of the obsolescence, the exorbitant price in order to produce the new card, once that this is broken off, regarding the repair costs.
As it can be seen from the columns of the histogram, the cost to support for the redesign is by far greater regarding the other financial expenditures that are taken place in the time: these last ones, in fact, nearly seem nonexistent in supported proportion to that one in the first period.
In order to try to improve the solution, also this time is calculates the costs totals making to slip in the time the moment to you of the redesign; these turn out to you, then, as in the other cases they have been confronts to you with the optimal solution, obtaining the following course of the worsening.


Figure 7.14: Economic worsening regarding the optimal solution.

As it is looked at, for the case base, that is when it does not preview to carry out some Bridge Buy, a worsening regarding the optimal solution of 81.41% is had.
The optimal one is caught up delaying the redesign until 2012: in this case, in fact, the worsening is of 42.81%.
Sure such increase is remarkable, but it is important to estimate also this type of resolutive strategy well, in how much, often, the redesign punctual because of the complexity of the LRU and the variety of critical types us on it, turns out practically impossible.
The relative cash flows you to the best condition are shown in the successive histogram (for the values send back to the Appendix B pag. 159).


Figure 7.16: Cash flows optimal case support modification for technical reasons.

 

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