TM 10-8415-209-10 TM 8415-10/2 (2) Interval Column.  This column tells you when you must do the  procedure in the procedure column. The  BEFORE  procedures  must  be  done  before  you  operate  or  use  the  equipment  for  its  intended  mission. DURING    procedures  must  be  done  during  the  time  you  are  operating  or  using  the  equipment  for  its  intended mission.  AFTER procedures must be done immediately after you have operated or used the equipment.  Monthly procedures must be done every 30 days after issue. (3) (Location,) Check/Service Column.  This column provides the location and the item to be checked or serviced.  The item location is underlined. (4) Procedure  Column.    This  column  gives  the  procedure  you  must  do  to  check  or  service  the  item listed  in  the  Check/Service  column  to  know  if  the  equipment  is  ready  or  available  for  its  intended  mission  or  for operation.  You must do the procedure at the time specified in the interval column (5) Not Fully Mission Capable If: Column.  Information in this column tells you what faults wilt keep your equipment from being capable of performing its primary mission.  If you make check and service Procedures that show faults listed 2-3