ties   of   all   authorized   items   required   to   provide   for adequate   support   of   100   equipments   for   one   year. Subsequent   appearances   of   the   same   item   will   have the  letters  “REF”  in  the  allowance  column. i.   Depot   Maintenance   Allowance   Per   100   Equip- ments.   Indicates   opposite   the   first   appearance   of each   item   the   total   quantity   authorized   for   depot maintenance   of   100   equipments.   Subsequent   appear- ances   of   the   same   item   will   have   the   letters   “REF’ in  the  allowance  column.  Items  authorized  for  use  as required  but  not  for  initial  stockage  are  identified with  an  asterisk  in  the  allowance  column. j. Illustration.  This column is divided as follows: (1)  Figure   number.   Indicates   the   figure   number of  the  illustration  in  which  the  item  is  shown. (2)  Item  number.  Indicates   the   callout   number used  to  reference  the  item  in  the  illustration. 4.  Special  Information a.  Identification   of   the   usable   on   codes   included in  the  description  column  of  this  publication  are: Code Used On A.......... Model T16 MIL 66 TYPE II only B...................... Model T16 MIL 68 TYPE II only C............. M o d e l T 1 6 - 6 8 b.  Repair   parts   mortality   has   been   based   on   1000 hours  of  operation  per  year. c.  Parts   which   require   manufacture   or   assembly at   a   category   higher   than   that   authorized   for   instal- lation   will   indicate   in   the   source   column   the   higher category. d. The   following   publication   pertains   to   the   Theo- dolite  and  its  components: TM  5-6675-270-15 Operator,    Organizational, DS, GS and Depot Maintenance   Manual e.  The   same   illustrations   are   used   to   illustrate   the repair  parts  and  special  tools  listed  in  both  organiza- tional   maintenance   section   and   direct   and   general support  and  depot  maintenance  section. 5. How to Locate Repair Parts a. When   Federal   stock   number   or   reference   num- ber is unknown: (1)  First.  Using   the   table   of   contents   determine the   assembly   group   within   which   the   repair   part belongs.   This   is   necessary   since   illustrations   are prepared  for  assembly  groups,  and  listings  are  divid- ed  into  the  same  groups. (2)  Second.   Find   the   illustration   covering   the assembly  group  to  which  the  repair  part  belongs. (3)  Third.  Identify  the  repair  part  on  the  illustra- tion  and  note  the  illustration  figure  and  item  number of  the  repair  part. (4)  Fourth.  Using  the  Repair  Parts  Listings,  find the  assembly  group  to  which  the  repair  part  belongs and  locate  the  illustration  figure  and  item  number noted  on  the  illustration. b.  When   Federal   stock   number   or   reference   is known: (1) First.  Using  the  Index  of  Federal  Stock  Num- bers  and  Reference  Numbers  find  the  pertinent  Fed- eral   stock   number   or   reference   number.   This   index is  in  ascending  FSN  sequence  followed  by  a  list  of reference   numbers   in   alpha-numeric   sequence,   cross- -referenced  to  the  illustration  figure  number  and  item number. (2)  Second.   Using  the  Repair  Parts  Listing,  find the  assembly  group  of  the  repair  part  and  the  illustra- tion   figure   number   and   item   number   referenced   in the   index   of   Federal   Stock   Numbers   and   Reference Numbers. c.  When   the   Federal   stock   number   or   reference number  is  known  and  the  repair  part  is  not  illustrated: (1) First.  Using  the  Index  of  Federal  Stock  Num- bers  and  Reference  Numbers  find  the  pertinent  Fed- eral  stock  number  or  reference  number  in  the  section titled   “Items   Not   Illustrated”   and   note   the   group number.   This   section   is   in   ascending   FSN   sequence followed  by  a  list  of  reference  numbers  in  alpha- numeric    sequence, cross-referenced   to   assembly group  number. (2)  Second.   Using  the  Table  of  Contents,  locate the  assembly  group  number  and  page  number. (3)  Third.   Using   the   applicable   group   number and  page  number,  locate  the  pertinent  stock  number or   reference   number   in   the   Repair   Parts   Listing. Items  which  are  not  illustrated  are  listed  at  the  end of the assembly group to which they belong. 6. Abbreviations ea. . . .    each ft . . . . .. foot grp. . . group 7. Federal Supply Codes for Manufacturers Code Manufacturer 89905 . . . . . . Wild Heerbrugg  Instruments   Inc 8.  Recommendations  for  Maintenance Publication   Improvements Report   of   errors,   omissions,   and   recommendations for   improving   this   publication   by   the   user   is   en- couraged.  Reports  should  be  submitted  on  DA  Form 2028   (Recommended   Changes   to   Publications)   and forwarded   direct   to   Commanding   General,   U.   S. Army   Mobility   Equipment AMSME-MPP, 4300 Goodfellow Mo.  63120. Command,   ATTN: Boulevard,  St.  Louis, v