TM  55-4920-403-20&P figure  D-2),  removing  the  old  assembly  and  riv- eting a new assembly in its place. (2)   The   compressed   air   panel   assembly (item  8,  figure  D-2)  may  be  replaced  by  removing the  air-oil  separator  (item  102,  figure  D-2),  piping (items  65  and  66,  figure  D-2)  and  unbolting  the panel.  Sealant  (item  81,  figure  D-2)  should  be  ap- plied  to  the  new  panel  before  it  is  bolted  in  place. Reinstall  the  piping  and  air-oil  separator. (3)  The  air-oil  separator  (item  102,  figure D-2)  may  be  replaced  by  removing  two  bolts  and washers  (items  89  and  103,  figure  D-2)  and  dis- connecting  the  separator  from  the  piping  (item  65, figure  D-2). e. Fire  Extinguisher  Bracket.   The   fire   extin- guisher  bracket  (item  99,  figure  D-2)  may  be  re- placed  by  removing  four  bolts,  Iockwashers  and flat  washers  (items  112,  113  and  114,  figure  D-2) and  installing  a  new  bracket  using  the  hardware removed from the old one. f. Shelf/Table.   The   shelf/table   (item   3,   figure D-1)   may   be   replaced   by   removing   eight   bolts (item  17,  figure  D-1)  and  installing  a  new  sheIf/ table   using   the   hardware   removed   from   the   old one. g. Hook  Board.  The  hook  board  (item  4,  fig- ure  D-1  )  may  be  replaced  by  removing  two  bolts and washers (items 13, 14 and 21, figure D-1) and installing  a  new  hook  board  using  the  hardware removed from the old one. 3-4. a WARNING All   electrical   repairs   or   replacement should   be   performed   by   an   aircraft electrician or other qualified person. Electrical Components Maintenance. Shelter Power Cable. (1)  The  shelter  power  cable  (item  2,  fig- ure  D-4)  should  be  carefully  inspected  for  breaks in  the  jacket  insulation  and  corrosion  of  the  elec- trical  contacts. (2)  The  connectors  (items  3  and  4,  figure D-4)   may   be   replaced   using   a   standard   blade screwdriver  to  remove  the  connector  covers  and loosen  the  screws  holding  the  wires  in  the  con- tacts. Be sure to insert the wires in the same con- tact  on  the  new  connector  that  they  were  installed in   on   the   old   connector.   Connectors   should   be wired   in   accordance   with   instructions   given   in drawing 4920-EG-058 (figure D-4). WARNING If  connectors  are  improperly  wired,  a serious electrical shock hazard may re- sult. (3)   Following   repairs   or   replacement   of parts   to   the   shelter   power   cable,   it   should   be checked  with  an  ohmeter  for  proper  connections between   connectors   and   to   insure   there   are   no shorts between contacts. NOTE The   ground   contact   is   bonded   to   the connector case. b. Light  Fixtures.  Light  fixtures  (item  53,  fig- ure   D-2)   should   be   inspected   for   broken   lamp contacts  or  other  damage.  The  lamp  (item  55,  fig- ure  D-2)  and  lamp  protector  (item  56,  figure  D-2) may  be  replaced  by  removing  the  screws  (item 107,  figure  D-2)  holding  the  retaining  straps  (item 54,  figure  D-2)  to  the  light  fixture.  To  replace  the light   fixture   assembly   (item   5,   figure   D-2),   first turn  off  the  20  amp  circuit  breaker  that  supplies power   to   the   lights   in   the   circuit   breaker   panel (items 29 and 30, figure D-2). Using a trouble light to   illuminate   the   shelter,   remove   the   lamp   and protector   as   previously   described.   Remove   the cover  of  the  fixture,  disconnect  the  power  wires, remove   the   nut   holding   the   conduit   connector (item 36, figure D-2) to the fixture and remove the screws  and  washers  (items  95  and  111,  figure  D- 2)  securing  the  fixture  to  the  ceiling.  Feed  power wires  through  the  end  of  the  new  fixture  and  se- cure   to   the   ceiling   with   screws   and   washers (items   95   and   111,   figure   D-2).   Install   conduit connector  nut,  connect  power  wires,  install  fixture cover,   lamp,   and   lamp   protector,   then   retaining straps. Turn circuit breaker back on and insure the new  fixture  is  operating  properly. c.   Power   Inlet   Panel. (1)  Inspect  the  power  inlet  panel  (item  3, figure  D-2)  for  loose  ground  stud  (item  28,  figure D-2),   corroded   power   inlet   connector   (item   25, figure   D-2)   and   damaged   electrical   outlet   cover and  connector  (items  24  and  26,  figure  D-2),  Re- place  the  power  inlet  connector  (item  25,  figure D-2)  by  first  de-energizing  and  removing  shelter power cable. Next remove screws and power inlet box  cover  (item  17,  figure  D-2).  Remove  four bolts, washers and nuts (items 108, 109 and 110, figure   D-2)   which   hold   connector   to   panel   and, using  a  standard  blade  screwdriver,  loosen  con- tact screws and remove wires from contacts. 3-2 Change 1 *U.S.   GOVERNMENT   PRINTING   OFFICE:   1993-555-028/80431