Establish internal reference points.Scan the inspection area thoroughlyorderly manner.Note any inconsistencies.Evaluate the inconsistencies.Report your conclusions.GEOMETRIC ORIENTATION OF THEENGINEand in anTo communicate information about an engineinspection, you must establish a geometric frame ofreference for the engine assembly. A language fordescribing the physical damage is also necessary. Anexample of this information is provided ingeometric orientation of the LM2500 GTE.figure 2-1,Figure 2-2shows an example of radial and axial cracking on acompressor blade; figure 2-3 shows an example ofcircumferential and axial cracking in the combustionsection. Table 2-1, a foldout at the end of this chapter,provides a list of condition codes and definitions ofterms that you need to know when inspecting theLM2500 GTE.When the probe is in the inspection hole, it is notunusual for you to lose your sense of direction. Onthe Wolf borescope, the large plastic disk just beneaththe eyepiece has an index mark that shows thedirection the probe object window is facing. You canfeel and see this mark. Another reference you can useto detect the direction the object window is facing isFigure 2-3.—Examp1es of circumferential and axial cracking.2-3
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