TM  5-6675-233-20P or salvage.  Items not coded  are  expendable.  Re- coverability codes are; Code Explanation R Applied to repair parts and assemblies which are  economically  repairable  at  DSU  and  GSU activities  and  normally  are  furnished  by  sup- ply on an exchange basis. T Applied  to  high  dollar  value  recoverable  repair parts which are subject to special handling and are issued on an exchange basis. Such re- pair parts normally are repaired or over- hauled at depot maintenance activities. U Applied  to  repair  parts  specifically  selected  for salvage by reclamation units because of pre- cious  metal  content,  critical  materials,  high dollar  value  reusable  casings  or  castings. (4) This column also lists, below the SMR code,  an  index   number  for  each  item  in  ascend- ing numerical sequence, which is used to locate items  in  the  publication  when  the  Federal  stock number  and/or  reference  number  is  known. b. Federal Stock Number.  This  column  indi- cates  the   Federal   stock   number  for  the  item. c.  Description. This   column   indicates   the Federal  item  name  and  any  additional  description of  the  item  required.  A  part  number  or  other reference number is followed by the applicable five-digit  Federal  supply  code  for  manufacturers in  parentheses.  Material  required  for  manufacture or  fabrication  is  identified. d. Unit of Issue. This column indicates the unit used as a basis for issue, e.g., ea, pr, ft, yd, etc. e.  Quantity  Incorporated  in  Unit.  This  column indicates  the  quantity  of  the  item  used  in  the functional  group. f.  Fifteen-Day  Organizational  Maintenance  Al- lowance, Column (4) of Section II and  Column (7) of  Section  III  and  IV. (1) The allowance columns are divided into four  subcolumns.  Indicated  in  each  subcolumn  op- posite the first appearance of each item is the total quantity of items authorized for the number of  equipments  supported.  Subsequent  appearances of  the  same  item  will  have  no  entry  in  the  allow- ance  columns  but  will  have  in  the  description column  a  reference  to  the  first  appearance  of the item.  Items authorized for use as required but not  for  initial  stockage  are  identified  with  an asterisk in the allowance column. (2) The quantitative allowances for organi- zational  level  of  maintenance  represents  one  ini- tial prescribed load for a 15-day period for the number  of  equipments  supported.  Units  and  or- ganizations authorized  additional  prescribed loads  will  multiply  the  number  of  prescribed  loads authorized by the quantity of repair parts reflect- ed  in  the  appropriate  density  column  applicable to the number of items supported to obtain the total quantity of repair parts authorized. (3) Organizational  units  providing  mainte- nance  for  more  than  100  of  these  equipments shall determine the total quantity of parts re- quired by converting the equipment quantity to a  decimal  factor  by  placing  a  decimal  point  before the next to last digit of the number to indicate hundredths,  and  multiplying  the  decimal  factory by the parts quantity authorized in the 51-100 allowance  column.  Example,  authorized  allowance for  51-100  equipments  is  40;  for  150  equip- ments  multiply  40  by  1.50  or  60  parts  required. (4)  Subsequent  changes  to  allowances  will be limited as follows: No change in the range of items is authorized.  If  additional  items  are  con- sidered  necessary,  recommendation  should  be  for- warded,  to  U.  S.  Army  Mobility  Equipment Command  for exception or revision to the allow- ance list.  Revisions to the range of items author- ized  will  be  made  by  this  Command  based  upon engineering  experience,  demand  data,  or  TAERS information. g.  Illustration,  Column  (8).  This  column  is divided  as  follows: (1)  Figure  number,  column  (8)  (a).  Indi- cates  the  figure  number  of  the  illustration  in which the item is shown. (2) Item number, column (8) (b).  Indicates the callout  number used to reference the item in the   illustration. 4.  Special  Information a. Identifications of the usable on codes includ- ed  in  column  (2)  of  Section  II  and  column  (3) of  Sections III and IV of this publication are: Code USed  on A -- (WILD HEERBRUGG MODEL T2-63 MIL) FSN  6675-983-8027 B -- (WILD HEERBRUGG MODEL T2-63 MIL) Serial number range 100656, 100934 thru 100963, 101084 thru 101112 FSN 6675-988- 5225 C  --  (WILD  HEERBRUGG  MODEL  T2-66-C  MIL) FSN  6675–937–2954 D  --  (WILD  HEERBRUGG  MODEL  T2-67  MIL) Serial number range 111285 thru 111309, 111585  thru  111607  FSN  6675-988-5225 Repair  parts  not  symbolized  are  applicable  to all end items and serial  number  ranges covered in this manual. b. Repair parts mortality has been based on 1,000 hours  of  operation  per  year. c.  Parts  which  require  manufacture  or  assembly at  a  category  higher  than  that authorized for in- i v