TM5-6115-585-24P NAVFAC  P-8-623-24P TO-35C2-3-455-4 SL-4-05684C/06585B A Item  requires  special  handling  or  condemna- tion procedure because of specific reasons (i.e., precious  metal  content,  high-dollar  value, critical material or hazardous material). Refer to appropriate  manuals/directives  for  specific  in- structions. c.   (USMC)   Special   Stockage   Indicator   Code   and Replacement  Factor  (Column  3). (1)  Special  Stockage  Indicator  Code.   This   column reflects  the  condition  under  which  certain  maintenance parts, (parts assigned NSN’S and coded in the “P” series source code of the SMR code), are stocked. The codes are explained  as  follows: No Code D T Indicates that the part may or may not be authorized  in  initial  allowances  to  using  or supporting organizations. The manner of deter- mining  initial  allowances  is  explained  in paragraph  (2)  below. Applied  to  maintenance  parts  that  are  not considered  critical  or  essential  to  be  on  hand and  are,  therefore,  not  authorized  in  initial allowances; however, these items are stocked within the Supply System and may be re- quisitioned based upon usage. Indicates that the part is authorized in garrison operating  allowances  in  order  to  comply  with state and local laws; however, the part is not authorized in Mount-Out since it is not combat essential. (2)  Replacement   Factor.    This   column   reflects   the replacement   factor   assigned   to   each   nationally   stock numbered maintenance repair part. This factor is assigned to the repair part on its first appearance in the publications. The replacement factor, expressed as a decimal, indicates the  average  rate  at  which  the  type  of  item  so  coded  has been used by Marine Corps field units or the rate at which design  engineers  anticipate  the  item  will  fail,  wear  out,  or otherwise  require  replacement.  All  computations  are  bas- ed  on  a  replacement  period  of  one  year.  Therefore,  a replacement factor of 0.08, applied to an item in this stock list, indicates that eight out of every one hundred of such items  used  in  the  end  item  of  equipment  to  which  this publication  pertains,  is  predicted  to  need  replacement  in one  year.  Likewise,  0.004  reflects  that  four  out  of  every thousand  in  use  are  predicted  to  require  replacement  in one year, while 2.0 shows that every one in use is predicted to be replaced twice during each year. (a)   Initial   authorized   stockage   levels   of   consumable and   salvageable   items   for   an   organization   are   to   be computed for predicted consumption based on the number of  items  employed  and/or  supported  by  an  organization within the number of days for which stockage is authoriz- ed. In computing Garrison Operating Stock or Mount-Out, authorized   levels   can   be   determined   by   the   requiring Marine  Corps  unit  by  multiplying  the  replacement  factor times the quantity used per equipment times the number of 4 end  items  employed  by  the  using  organization  or  sup- ported by the service organization times the authorized day level expressed in and divided by 12. Specific formulas and examples   are   provided   in   Marine   Corps   Order,   MCO P 4 4 0 0 . 7 9     –. The  replacement  factors  used  in  initial  stockage  com- putations  should  be  revised,  if  warranted,  after  significant usage is experienced in accordance with the guidelines of MCO 4400.32_. The following formula replacement factor, “X”   represents   actual   usage   experience   (1   year),   “A” represents   the   application   per   equipment,   and   “B” represents  the  number  of  equipments  supported. (b)   Initial   allowances   for   maintenance   float   items (recoverability   codes   “R”   and   “D”)   for   the   FMF   and appropriate  post  and  stations  are  as  furnished  by  Initial Issue Actions. Changes   to   maintenance   replacement   rates   resulting from     actual     usage     may     require     recomputation     of maintenance  float  allowances  by  holding  units.  Any  re- quired recomputation of maintenance float allowances will be  made  in  accordance  with  MCO  4000.6_. (c)  The  replacement  factor  for  same  as  (S/A)  items  is indicated upon the first appearance of the item in the major combination,  component  or  assembly. d.  (ALL)  National  Stock  Number  (Column  4)  indicates the National Stock Number assigned to the item and will be used  for  requisitioning  purposes. e.  (ALL)  Description.  Indicates  the  Federal  item  name and  any  additional  descriptions  of  the  item  required.  The abbreviation “w/e” when used as part of the nomenclature, indicates   that   the   National   Stock   Number   includes   all armament, equipment, accessories and repair parts issued with the item. A part number or other reference number is followed  by  the  applicable  five  digit  Federal  Supply  Code for   manufacturer. If   two   reference numbers and Federal Supply Codes for manufacturer are listed, the first listing refers to the Department of Defense Drawing  Number,  the  second  listing  refers  to  the  actual part manufacturer. Items that are included in kits and sets are listed below the name of the kit or set f.  (ALL)  Unit  of  Measure  (U/M).  Indicates  the  standard of the basic quantity of the Iisted item as used in performing the   actual   maintenance   function.   This   measure   is   ex- pressed by a two-character alphabetical  abbreviation (e.g., ea, in, pr, etc.). When the unit of measure differs from the unit  of  issue,  the  lowest  unit  of  issue  that  will  satisfy  the required  units  of  measure  will  be  requisitioned. g.   (ALL)   Quantity   Incorporated   in   Unit.   Indicates   the quantity  of  the  item  used  in  the  assembly  group.  A  ‘V” appearing in this column in lieu of a quantity indicates that a   definite   quantity   cannot   be   indicated   (e.g.,   shims, spacers, etc.). h.   (MC)   Quantity   Per   Equipment.   Indicates   the   con- solidated quantity of a maintenance part used on an end item upon every appearance of the part in this publication.