Reassuming:

• The input:
  • Directory of the LRU and population;
  • Baseline of the system;
  • Data of obsolescence;
  • Coefficients of employment of the members;
  • Purchase price of the members;
  • MTBF of the LRU;
  • Cost of fabrication of the LRU.
• The output:
  • Cost of resolution for every LRU;
  • Resolutive action for every LRU;
  • Cost total of resolution;
  • Schedulazione of the actions in the time.
• The hypotheses:
  1. The CLS begins in 2006.
  2. For the calculation of the requirementses of the cards, I suppose that, when a LRU (card) is broken off, replaces it: I put myself that is in the worse one of the cases without to consider the possibility of repairs. The made hypothesis is not completely peggiorativa in how much, for being able to respect the tight times tax from the CLS, relati you to the importance works them of the LRU to repair in the system, not being to us often a TAT (Turn Aroud Time) adapted, increases the number of objects in circulation.
  3. For the members with FR=6, by now obsolete, I act immediately.
  4. For the members with FR=5, for which the half of the obsolescence interval is last, but that they still come indicates you like assets from the constructors, I act to the end of the obsolescence interval.
  5. For the members with FR=4 and 3, in order to comply with the uncertainty of the esteem of one given therefore far in the time, I choose to act to half of the interval of obsolescence indicated from tool the CAPS Export©.
  6. The costs of labor for the redesign are calculate in relation to the complexity and criticità to you of the card, that is in way proporziona they to the number of critical types present us on it.
  7. In the choice of the new necessary members to the redesign, she comes assumed to choose dispositive you that they are at the beginnig of the life cycle.
  8. The new members cost like the old ones of the same tipologia, at the present moment.
• The support parameters:
  • Discount rate, that is the cost of capital them for the company. In the simulation, it has been placed equal to 12%.
  • Hour cost of the specialistic staff who has been placed equal to 60€.
  • Maggiorativo coefficient that comes used in order to consider the unavoidable increase of the cost of purchase of the members; (200% for the members with FR=6).
  • Necessary hours of labor to redesign of one the tipologia of equal obsolete members assumed to 40.
  • Percentage on the alive cost of the materials that holds account of all the factors of cost connects you to the imagazzinamento. The value has been placed equal to 20%.
  • Qy = Unit cost of fabrication of the card y that it holds account of the cost of the materials and the actual costs of fabrication.
  • M = annual Cost of monitoring.

The model has been implemented with a date base developed in Microsoft Access that it receives in input the information listed in the previous paragraph under the heading of input and gives back a report from which the necessary information to the development of the calculations are gained.
Such information come then elaborated in a folder of job constructed in Microsoft Excel to the aim to obtain turn out to you brought back in the paragraphs succeeded to you.
The date base in Access comes executed by means of a macro, launch from the customer through a mask, while an industrialization of the calculation folder is being still studied.
The choice of the software has been dictated from the necessity, in the first phase, to arrange more information entirety, that it has made to prefer the use of Microsoft Access; subsequently, being necessary an instrument that it allowed to carry out calculations quickly and in parametric way, for being able to make various the attempted ones to you, is chosen to use Microsoft Excel.