Logic   Flow   Charts Logic   flow   charts   have   the   event   sequences   as determined  by  the  logic  circuits.  The  charts  are,  in effect,  pictures  of  the  logic  equations.  They  maybe  used along  with  the  logic  equations  found  in  chapter  3  of  the S9234-series   technical   manuals. Timing   Diagrams Timing   diagrams   are   for   all   significant   timing relationships. The  diagrams  show  the  exact  timing relationships   and   the   origin   of   all   significant   timing signals. Interconnecting    Diagrams Interconnecting   diagrams   show   the   internal   cabling between   the   consoles   and   the   electronic   enclosures. These  diagrams  identify  the  cabling  and  components  by reference   designations. Troubleshooting   Functional   Dependency Diagrams Troubleshooting   fictional   dependency   diagrams (TFDDs)   show   the   fictional   dependency   of   one   circuit upon  another.  The  TFDDs  are  setup  in  pyramid  fashion. The  vertical  chains  of  boxes  show  contributing  branches of   the   signal   development.   They   also   show   the fictional   dependency   through   successive   levels.   The box   at   the   top   represents   the   function   output   of   the equipment  and  reflects  the  results  of  all  of  the  boxes below   it. Circuit   Card   Locator   and   Function Information   Plates Circuit   card   locator   and   function   information   plates (troubleshooting   matrices)   present   the   maintenance information   you   need   to   isolate   a   specific   circuit   card location.  The  matrix  for  troubleshooting  is  on  the  inside of  the  door  of  each  electronic  cabinet  assembly  (ECA). The   matrix   relates   the   ship   functions   to   the supporting   circuit   card   within   the   ECA.   The   ship function   column   lists   the   ship   function   controlled   or monitored.   The   qualifier   column   identifies   the   specific function  listed  in  the  function  column.  The  type  column identifies   the   function   as   a   control,   status,   or   alarm function.  The  card  location  column  contains  the  card locations   within   the   ECA.   An  X  in   the   card   location column  indicates  that  the  circuit  card  is  in  that  location in  the  ECA  card  rack.  The  listings  in  the  ship  function column   relate   to   the   identities   of   the   discrete   panel readouts  rather  than  the  fictional  groupings.  The troubleshooting  matrix  can  be  used  in  conjunction  with the   demand   display   directories. TROUBLESHOOTING    EQUIPMENT The  tools  and  test  equipment  needed  to  properly adjust,   align,   calibrate,   and   troubleshoot   the   ECSS equipment  are  listed  in  volume  1,  chapter  6,  of  all  the S9234-series  technical  manuals.  This  is  a  list  of  all  test gear,   tools,   and   consumables   needed.   However,   it does  not  necessarily  mean  that  all  of  them  have  to  be used  on  each  piece  of  equipment.  Equivalent  tools  and test  gear  with  superior  measuring  capabilities  may  be substituted  for  the  items  shown  by  a  double  asterisk  (**) before  the  name. THE  ALLISON  501-K17  GTE Maintenance   and   troubleshooting   procedures   for the  Allison  501-K17  GTE  are  similar  to  the  procedures used  for  the  LM2500  engine.  In  all  cases,  you  must  use the  proper  EOSS,  PMS,  and  technical  manuals  when conducting   any   maintenance   or   troubleshooting. Volume 2 of the  Model  104/Model  139  Gas  Turbine Generator  Set  technical   manual   is   divided   into   two parts.   Part   1   contains   all   the   necessary   information, procedures,   and   diagrams   for   locating   a   malfunction. Part  2  contains  the  corrective  maintenance  procedures for  adjustment  and  alignment,  repair,  and  removal/ replacement  of  components. When   entering   and   working   within   the   engine enclosure,   follow   the   proper   EOSS   procedures   and   all standard   safety   precautions   at   all   times. COMPONENT   CHANGEOUT Gas  turbine-powered  ships  are  outfitted  with  all  the equipment  necessary  to  remove  and  replace  engine components. As  a  senior  petty  officer,  you  will  be supervising   component   changeouts.   As   with   any   job, you  must  plan  and  organize  before  starting  the  project. Since  most   GTE  problems  occur   while   the   ship   is underway,   corrective   maintenance   must   be   performed immediately. If  you  insist  upon  strictly  following step-by-step   procedures   as   set   forth   in   the   technical manual,  you  will  save  time  by  preventing  errors.  Do  not rely   upon   your   memory   for   component   changeouts. 2-28