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The systems of the aircrafts have the most complex devices for the great security that need support to passengers to fly 1 . In the case of the study carried out, an analysis of harnesses used in the aircraft landing systems of the Boening brand is presented 2 . The investigation showed small deteriorated sections with the copper wire and tin in their terminals in an oxidized way 3 , which sometimes generated electrical conductivity towards the landing system and sometimes did not present any kind of electrical conductivity. This in a process of simulation of the functionality of the landing system, caused by failures, which could be generate a great tragedy, to occur principally in a commercial flight of real life. This happened in the operations of a clean room, where humidity and temperature were controlled, as well as particles and polluting gases 3,4 , mainly with filters to detect and not allow entry to the clean room outside the company, of sulfides and oxides of nitrogen coming from vehicular traffic 5 . Even with specialized filters, oxidation was generated in the terminals of the harnesses. This was at certain times of the year (being in seasonal, monthly, daily and hourly periods). The harnesses were evaluated by means of an electric test machine with a plate where the terminals of the harnesses were assembled and generated an analysis of the electrical conductivity process.

Evaluation of Functionability of Harnesses Used In the Aircraft Landing System Manufactured In the Aerospace Industry of Mexicali, B.C., Mexico