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Chapter 2 Gas Turbine Maintenance
Geometric Orientation of the Engine

Gas Turbine Systems Supervisor - Supervisor manual for Gas Turbine Engines
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Figure 2-1.—Geometric orientation of the LM2500 GTE The   following   section   discusses   the   borescope procedures   used   to   inspect   the   LM2500   GTE.   The inspection  procedures  and  the  knowledge  gained  from damage  evaluation  may  also  be  applied  to  the  borescope inspection   of   the   Allison   501-K17   GTE. GENERAL   INSPECTION   PROCEDURES It   is   a   good   engineering   practice   to   review   the machinery   history   of   an   engine   before   you   conduct   an inspection   Various   component   improvement   programs will  eventuallyy  effect  all  engines  in  service.  A  rebuilt  or modified   engine   may   contain   improved   parts   that   differ from   the   original.   An   example   of   this   is   the   first-stage compressor   midspan   damper   that   may   have   its   original coating,  an  improved  coating,  or  a  carboloy  shoe  welded on   at   the   midspan   damper   interface.   If   you   review   the machinery  history,  you  will  discover  the  status  of  those parts   that   have   been   changed   or   modified. Assuming   that   the   engine   history   is   normal   and FOD  is  not  suspected,  you  should  be  aware  of  the following    factors    when    conducting    a    borescope inspection: Know   your   equipment. Locate   all   inspection   areas   and   ports. Figure 2-2.—Example of radial and axial cracking. 2 - 2







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