TM    55-2840-241-23 CHAPTER  3 PREPARATION FOR SERVICE, STORAGE, AND ENGINE HANDLING Section  I.  PREPARATION  FOR  SERVICE  AND  STORAGE 3-1.   General. NOTE The  periodic  preservation,  storage, and activation of engines are prescribed  in  TM  55-1520-228-23. soap  solution  (item  1,  table  2-2)  aat  all  closures. This   section   provides   procedures   for   the preservation,   depreservation   and   storage   of   a complete   en   me   assembly.   It   also   contains tion  of  the  compressor,  fuel  pump,  gas procedures   or   the   preservation   and   depreserva- producer   fuel   control,   and   power   turbine   gover- nor.   Weight   and   dimension   data   for   the   ship- ping   containers   are   shown   in   paragraph   3-14. NOTE All    engine    operation    procedures will  be  accomplishshed  in  accord- ance   with   TM   5-1520-228-10. 3-2.   Preservation   Maintenance. Preservation   maintenance   is   not   represer- vation,   but   is   the   regular   inspection   an   re- placement   of   the   dehydrating   agent.   Allow engine   awaiting   installation   to   remain   in   the dehumidified   shipping   container   as   long   as possible. 3-3.  Inspection  of  Pressurized  Containers. Immediately   upon   receipt   of   an   engine   at an   activity   and   every   90   days   (or   more   fre- quently)   thereafter   check   the   relative   humidity indicator  and  the  internal  pressure  of  the  con- tamer   in   accordance   with   table   3-1. NOTE An  all  blue  color  in  the  humidity indicator   indicates   a   safe   condi- tion.   As   moisture   content   inside the   container   increases,   the   in- dicator  color  willl  change  from  blue to  pink. An   all   ink   condition   is considered   unsafe   and   indicates that the desiccant must be changed and  the  container  repressurized. a.   If   the   humidity   indicator   indicates   that the  relative  humidity  is  less  than  40  percent and  the  internal  pressure  is  more  than  1  psig, no   maintenance   is   necessary   until   the   next regular     inspection. b.   If   the   humidity   indicator   indicates   that the  relative  humidity  is  less  than  40  percent but   the   internal   pressure   is   less   than   psig,   the container  shall  be  checked  for  leadage,  using  a ( R e f e r    t o    T B    5 - 8 1 0 0 - 2 0 0 - 2 4 . )    W h e leakage   has   been   corrected,   the   container   shall be  repressurized  to  the  value  stated  in  table  3- 1.   Use   clean   dry   compressed   air.   Record date   of   represurization   and   name   of   activity m   appropriate   section   of   engine   historical record. c.   If   the   humidity   indicator   indicates   the relative  humidity  to  be  40  percent  or  more,  an unsafe   or   corrosive   condition   exists.   Comet as   follows: (1)   Depressurize   shipping   container   by opening   air   filling   valve   a   front   of   container. Do   not   disturb   relief   valve Present pressure valve could be af- fected. (2)   Allow   air   pressure   to   return   to   zero. (3)   Remove   capscrews   and   nuts   that s e c u r e     c o n t a i n e r     h a l v e s     t o g e t h e r (4)   Remove   cover   from   container   and   in- spect engine  to determine its serviceability. Any  presence  of  corrosion  on  the  inlet  or  com- pressor   housings,   or   on   other   visible   exterior surfaces,   or   on   the   compressor   or   turbine blades  or-vanes  is  cause  to  render  the  engine as    unserviceable. (5)   If   engine   is   found   to   be   serviceable, remove  it  from  container  and  place  it  in  ser- vice  or  represerve  it  per  paragraph  3-11. (6)   If   unserviceable   inspect   and   repair   to   a like-new   corrosion   free   condition   per   ap- aplicable  paragraphs  within  this  manual  as authorized   by   Maintenance   Allocation   Chart. If  not  repairable,  ship  engine  to  overhaul. 3-4.  Removal  of  Engine  From  Shipping Change 16 3-1