TM 5-6115-590-12 Section V.  Preventive Maintenance Checks and Services (Monthly and Quarterly) 4-11.  General To insure that the power plant is ready for operation at all times, it must be inspected systematically so that defects  may  be  discovered  and  corrected  before  they result   in   serious   damage   or   failure.      The   necessary preventive   maintenance   checks   and   services   to   be performed  are  listed  and  described  in  paragraph  4-12. The  item  numbers  indicate  the  sequence  of  minimum inspection   requirements.      Defects   discovered   during operation  of  the  unit  will  be  noted  for  future  correction, to  be  made  as  soon  as  operation  has  ceased.    Stop operation  immediately  if  a  deficiency  is  noted  during operation    which    would    damage    the    equipment    if operation     were     continued.          All     deficiencies     and shortcomings    will    be    recorded,    together    with    the corrective  action  taken,  on  DA  Form  2404  (Equipment Inspection  and  Maintenance  Worksheet)  at  the  earliest possible opportunity. 4-12.  Preventive Maintenance Checks and Services Preventive   maintenance   checks   and   services   are listed and described in table 4-1. Section VI.  Troubleshooting 4-13.  General a. This  section  contains  troubleshooting  informa- tion  for  locating  and  correcting  most  of  the  operating trouble  which  may  develop  in  the  power  plant.    Each malfunction for an individual component, unit, or system is followed by a list of tests or inspections which will help you to determine probable causes and corrective actions to take.  You should perform the tests/inspections in the order listed. b. This   manual   cannot   list   all   malfunctions   that may   occur,   nor   all   tests   or   corrective   actions.      If   a malfunction and its corrective action is not listed, notify your supervisor. NOTE All replacement procedures for circuit breakers,  switches  and  relays  are  performed in a similar manner. c. A    gas    turbine    engine    analyzer    is    used    in conjunction with table 4-2 for checking engine operation and isolating malfunctioning components during troubleshooting, and for check and adjustment of engine components after repair.  The connection and operation of  the  engine  analyzer  is  described  in  paragraph  4-14. A temperature conversion chart is provided in table 4-3. 4-14.  Using Gas Turbine Engine Analyzer During Troubleshooting a. Gas Turbine Engine Analyzer.  The gas turbine engine  analyzer  provides  instrumentation  for  checking the engine electrical, hydraulic, and control air systems, and   for   controlling   and   monitoring   engine   operation during   troubleshooting   or   checking   procedures   after repair.    The  analyzer  includes  a  separate  portable  fuel pressure   gauge   and   gauge   saver,   a   multimeter,   and special cable assemblies, all of which are stored in the analyzer  case.    The  analyzer  control  panel  is  shown  in figure 4-14.  The analyzer cables, hoses, and a special purpose    cable    assembly    required    to    connect    the analyzer  to  the  power  plant  are  shown  in  figure  4-15. The  three  hoses  required  are  not  part  of  the  analyzer and must be procured separately.  An overlay plate, part of  the  special  purpose  cable  assembly,  which  must  be installed  on  the  analyzer  panel  to  provide  connection nomenclature, is shown in figure 4-15. b. Connection  of  Gas  Turbine  Engine  Analyzer  to Power Plant.  Connect the analyzer to the power unit as shown in figure 4-16 while observing the following. (1) Place  analyzer  in  a  convenient  position near    the    left    side    of    the    power    plant    to    facilitate connections.    Insure  that  all  analyzer  switches  are  in OFF    or    spring-loaded    position    before    making    any connections to power plant. (2) Install main receptacle of special purpose cable assembly on MAIN plug of analyzer panel.  Install overlay  plate  (figure  4-15),  attached  to  special  purpose cable    assembly,    over    analyzer    indicator    lights    and switches locating cutout in plate over READY TO LOAD LIGHT on analyzer panel (figure 4-14) to provide correct identification of analyzer lights, switches, and static test jacks. (3) Disconnect engine harness receptacle J36 from   power   plant   plug   P36   (figure   4-16).      Connect engine   plug   on   special   purpose   cable   assembly   to engine   harness   receptacle   J36;   connect   power   plant receptacle  P36  on  special  purpose  cable  assembly  to power plant plug P36. (4) Disconnect instrument panel harness receptacle  J14  from  power  plant  plug  P14.    Connect instrument     panel     plug     on     special     purpose     cable assembly  to  instrument  panel  harness  receptacle  J14. Connect power plant receptacle P14 on special purpose cable assembly to power plant plug P14. 4-29