The measurement of Conductivity instrument during airplane maintenance

The measurement of conductivity instrument during airplane maintenance 

Through the practical problems that author have met in electrical conductivity measurements,combined with the basic theory of conductivity measurement,discussing the electrical conductivity in the present application of the civil aviation aircraft maintenance and matters need to have attention 。In this papers, electrical conductivity measurement in the civil aviation aircraft maintenance has certain reference and guiding significance。

At all levels of aircraft maintenance ,the aircraft structure damage inspection and repair become essential maintenance means,with the constant improvement of the aircraft maintenance level and deepening of the structure maintenance depth ,thermal damage is as a form of structural damage has become the object of structural inspection and repair ,for aircraft airframe,the concrete showing form of thermal damage is lightning damage ,in thunderstorm season, some parts with high resistance or sharp areas on the plane are vulnerable to lightning ,particularly around the adjacent fasteners, the outer panel skin is usually being thermal damage ,then it will constitute cracks,a hidden danger from skin cracking,the serious lightning and even have ablation on fasteners and breakdown skin,for aircraft parts,some components with high-speed on the plane such as wheel hub,brake hub and shaft running stopped abruptly ,it will cause the surface of parts rise to a high temperature then cause the  qualitative change。

IT changes all we required mechanical properties and anti-corrosive quality and so on chemical properties of metal structure itself，thereby it maybe make metal structure decrease the anti-corrosive quality in 

Metal structure suffer from heat to a certain extent can be understood as a local processing ,and this kind of treatment is harmful for metal structure ,local area and form actual discontinuity (it usually means flaw) and lead to the structure affects the airplane safety。And have potential destroy harm on the structure completeness of plane. This kind of thermal damage can be determine by visual inspection,observe its outer surface whether has thermal damage marks such as color change,but can not determine the thermal damage measurement.

Determine whether the parts are available to use and whether the damaged skin needs to be repaired ，also the harm in the early period generally not perform ,but due to thermal damage has been caused material changes,so it will affect to continue to use of the structure 

involved,therefore make sure the safety of plane structure or parts is very important 。Conductivity is one of the important performance parameters of the metal,for a metal performance with stability ,its conductivity value is always in the scope of a relatively number,and the metal with producing thermal damage and metal conductivity value in wound area and the surrounding area will have corresponding change,by comparing the measured value and the reference value,it is easy to quantitatively judge whether the performance of the metal has changed。The accuracy of conductivity meter is high ,high efficiency,simple operation and easy to carry，the conductivity measurement of aircraft structure is very effective,so using the electrical conductivity meter do electrical conductivity value measurement on metal structure is one of effective and important methods to measure plane structure 。