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

7.1.5 First modification for technical reasons.

Watching the tables that bring back the actions to undertake on ciascuna LRU, Notes that for LRU 37 is previewed a punctual redesign one is for the members with FR=6 that with FR=5; from the technical point of view, this type of resolution could not be feasible.
It has been believed therefore, to consider a redesign total of the card, that it is usually more expensive, sometimes also a lot, redesign instead partial and to estimate the worsening on the total costs of resolution.
In the successive tables, for greater clarity, it comes brought back the sunto of the actions to undertake for the LRU interested from members with FR=6 and FR=5.
Obviously, these only differ from the previous ones for LRU 37.

LRU with members characterizes to you from FR=6.

Nome LRU

TipiCritici

PopolazioneCritici

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

LB

82,91%

LRU 36

6

28

1

LB

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

TipiCritici

PopolazioneCritici

Fabbisogno17

Action

CostoLB/CostoRD

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

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 7.2: Resolutive actions for the first modification for technical reasons.

The cash flows previewed in this case, following the approach of base of the model are brought back in the diagram following (for the values send back to the Appendix B pag. 159).


Figure 7.8: Cash flows case base first modification for technical reasons.

As it is looked at from the legend of the diagram, in this case of redesign total, is necessary to consider, in the costs of resolution of the obsolescence, also the delta cost that is between the costs of repair of the cards and those of fabrication: once put in production one new card, in fact, when verification a return from the field, I cannot simply repair it, but I must supply one new LRU answering to the specific new of plan.
Obviously, it must hold account of this cost from the moment in which the redesign is carried out.
In the event of the redesign punctual, this cost, for the method of used calculation, already is comprised in the cost of the resolutive action. Also in this case, in order to try to improve the solution, it has been believed to send back the action of redesign, satisfying in the wait the question resorting to of the Bridge Buy.
The course of the worsening percentage, regarding the optimal solution characterized with the shape base of the model in the previous paragraph, taken place in several the cases, is diagrammato in the successive diagram.


Figure 7.9: Economic worsening regarding the optimal solution.

As it is looked at, the optimal solution is obtained carrying out the redesign total of LRU 37 in 2012, that is carrying out Bridge equal Buy to the necessary amount to the sopportabilitą for six years of the members with FR=6 and for five years for the members with FR=5. In these conditions a worsening regarding the optimal solution characterized with the shape is had base of the model of 21.26%, to new evidence that the redesign costs totals are remarkablly greater of the costs of redesign punctual. The relative cash flows you to this situation, are brought back in the successive figure (for the values send back to the Appendix B pag. 159).


Figure 7.10: Cash flows optimal case first modification for technical reasons.

 

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