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LM2500 Engine Changeout
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Gas Turbine Systems Supervisor - Supervisor manual for Gas Turbine Engines
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GTG Engine Changeout

and   technicians   are   qualified   for   tasks   assigned   and   all safety  equipment  is  on  station  before  starting  changeout. COORDINATION You   can   reduce   or   eliminate   wasted   of   time   by properly   coordinating   several   tasks   throughout   the changeout.   Simple   things   such   as   the   proper   placement of   the   special   support   equipment   (SSE)   containers   can eliminate   extra   walking   and   moving   of   components. The   SSE   containers   should   be   placed   within   the   reach of   the   crane   to   avoid   unnecessary   movement   of equipment   into   the   lift   area.   Crane   service   must   be controlled   and   used   exclusively   for   the   changeout.   The engine  containers  should  be  brought  to  the  site  as  soon as   possible   so   they   can   be   opened   and   ready   for installation   when   scheduled. T e a m    m e m b e r s    m u s t    c o o r d i n a t e    a m o n g s t themselves  for  certain  functions,  such  as  the  removal and  installation  of  components  and  the  constant  passing of   fixtures   down   and   into   the   module.   Communication between  team  members  during  the  changeout  process  is very    important. One  way  you  can  enhance  both teamwork  and  communications  is  by  the  use  of  portable radio   equipment. POST   CHANGEOUT   REQUIREMENTS With   the   completion   of   an   engine   changeout,   you must   return   the   SSE   and   container   to   the   cognizant repair   (support)   facility.   The   damaged   engine   is packaged   in   a   container   and   is   then   shipped   to   the appropriate   NADEP   for   repairs.   The   paper   work involved  in  the  changeout  is  lengthy,  but  necessary  for proper   documentation. careful   preparation   of   SSE containers   and   engine   containers   will   ensure   they   will reach   their   final   destination   with   no   shipping   damage. Returning   Containers Returning   the   replaced   gas   generator,   power turbine,”   and   containers   requires   that   the   major components   plus   the   T5.4  and  Pt5.4  harnesses   and   the speed  sensors  of  that  engine  be  packed  within  the containers.   The   completed   log   book   is   also   returned with  the  container.  After  everything  is  secured  within the   containers   and   the   desiccant   bags   have   been   dried out/changed,   the   cover   is   bolted   down   and   pressurized with   nitrogen   for   shipment.   The   ship’s   supply department   is   responsible   for   shipping   the   engine containers   to   the   designated   NADEP. When   the   SSE   containers   have   been   completely inventoried,   restacked,   and   secured,   the   supply   system is  responsible  for  returning  the  empty  containers  to  their place   of   origin. The   05X32   office   of   NAVSEA   is notified  of  the  condition  of  the  containers  by  the  team leader  via  the  chain  of  command. Reports Reports  from  the  team  leader  require  the  completion of   the   record   log   book   for   each   component   and   the proper  closeout  of  that  log  before  stowage  in  the  engine containers.  All  entries  should  be  complete  up  to  the  time of  changeout,  checked  for  correctness,  and  signed  off by   the   engineer   officer.   The   SSE   containers   that   were inventoried   on   arrival   are   to   be   inventoried   again   at completion  for  reissue  to  the  next  user.  The  engineer officer  and  main  propulsion  assistant  are  required  by squadron   directives   to   notify   the   proper   people   of   any irregularities   at   the   completion   of   the   changeout.   If lessons   were   learned   because   of   the   changeout,   notify the   people   concerned. Any   unique   or   suspect occurrences   could   be   very   valuable   sources   of information. LESSONS  LEARNED The   following   section   describes   some   lessons learned   during   engine   changeouts. Pierside   Changeouts Since  the  first  changeout  on  the  SPRUANCE  class ships,   problem   areas   and   past   discrepancies   during pierside  changeouts  have  been  numerous.  Problems such   as   location   of   the   equipment   and   containers   at pierside   can   delay   the   job.   When   equipment   or containers  are  placed  out  of  the  crane’s  reach,  the  delay is  costly  and  frustrating. Some   changeouts   have   been   hampered   by   crane service  that  was  not  totally  dedicated  to  the  job  of  engine changeout.  Many  hours  were  lost  awaiting  the  crane. Crane  services  are  needed  full  time  throughout  the changeout.   All   concerned   personnel   should   realize   that to   complete   the   changeout   on   time,   the   crane   and operator’s   services   are   required   the   full   36   hours. Engine   lifting   is   not   all   that   is   required   of   the   crane. Every   component   of   the   rail   system   plus   all   the   lift fixtures   require   crane   services.   The   crane   will   be   in constant  use,  especially  when  the  personnel  basket  is used.  Personnel  are  also  required  to  check  the  engine’s guide   rollers   in   the   permanently   mounted   guide   tracks for   freedom   of   movement. 2-30

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