i.   One-Year   Allowances   Per   100   Equip- ments/Contingency    Planning    Purposes    indi- cates the quantity of items required for distri- bution and contingency planning purposes. j.   Depot   Maintenance   Allowance   Per   100 Equipments  indicates  the  total  quantitiy  of  items recommended  for  depot  maintenance  of   100 equipment.  Items  recomnmended  for  immediate use  only  are  identified  with  an  asterisk  in  the allowance  column. k.  Illustration. (1)  Figure   Number   indicates   the   figure number   of  the  illustration   in   which the  item  is  shown. (2) Item or Symbol Number indicates the callout  number  used  to  reference  the item in the illustration. 4. Special  Information The following publications pertain to Heater, space and its  components. TM   5-4520 Operator, Organiza- 208-15 tional, Direct and General Support and Depot   Maintenance 5. Instructions  for  Locating  Repair  Parts a. When  Federal  Stock  Number  or   manu- facturer's part  number  is  unknown. (1) (2) (3) First.  Using   the   index   of   contents, determine  the  functional  group  or  sub- group, i.e., engine, engine  assembly, transmission,   transmission   assembly, within  which  the  repair  part  belongs. Locate   the   appropriate   page   in   the manual  and  identify  the  part. Second.  Locate   the   repair   part   and the  illustration  figure  and  item  num- ber as shown in the last two columns of  the  repair  parts  listing. Third.  Identify   the   repair   part   on the   illustration. b.  When  Federal  Stock  Number  or  manu- facture's   part  number   is   known. (1)  First.   Use   the   index   to   locate   the Federal  stock  number  or  manufactur- er's   part   number.   This   index   is arranged   in   alphameric   sequence (2) TM    5-4520-208-25P cross-reference  to  page   number   and manufacturer’s   code. Second. Refer to the appropriate page in the parts  listing.  Locate  the  repair part   and   the   illustration   figure   and item number as shown in the last two columns  of  the  parts  listing. 6.    Abbreviations 7. Index  of  Federal  Supply  Codes Code Manufacturers 01930 __Ame.rock  Corporation 02582_ Savoy Products  Company 07707 __ United Shoe Machinery Corporation Fastener Division 11583__ Champion Spa* Plug Company 11764- - -Msaon Company, Inc. 16236-_Crouse-Hinds   Company 21387 __Fairbanks  Morse  and  company 43334 __New Departure Division of General Motors Corporation 69780__Thomas and Betts Company 61864 -—-United-Carr  Fastener  Corporation 62869__Veeder-Roots,  Inc. 71896 __Delvan  Manufacturing  Company 72962__ Elastic Stop Nut Corporation of America 76005 --Lord Manufacturing Company 77122__Palnut Company 78257__Snap-Tite,  Inc. 79470 --Weatherhead Company 80205 __National Aircraft and Standard Committee Aeronautical Industries Association of America 81336 --Corporation of Engineers 81948--Federal  Specifications 83269----Dual  Drive  Inc. 83642  --  Standardization  Division  Department  of Defense 83930--- Adel Division General Metals Corporation 88044 ----Aeronautical  Standard  Group  Department of the Navy and Air Force 90598 ---American Air Filter 91816----James-Pond-Clark  Company 92940__Doerr Electric Corporation 96523 --Klemm Automotive Products Company 96906 __Military Standards 99166 __ Sunstrand Hydraulic Division of Sund- strand  Corporation v