shipboard  aviation  stocks  are  off-loaded  to  designated naval air stations for inventory management purposes. MSP  material  is  stored  in  designated  cabinets  in mockup staging areas. The  MSP  cabinets  will  be positioned on the ship at the time of re-AVCAL. l  Operational  Support  Inventory  (OSI)  is  the quantity  of  prepositioned  material  required  to  support the  planned  aircraft  program  and  maintenance  mission of an operating site. The OSI is composed of “fixed allowance”  for  DLR  and  FLR  as  well  as  “fixed” operating  level  for  consumables. . Order and Shipping Time (OST) is the interval between  the  time  a  stock  point  processes  a  stock replenishment requisition to a supplier and receipt of an NAVICP (supplier) in-stock item. The OST is currently fixed at 17 days. . Supplemental Aviation Spares Support (SASS) is commonly retimed to as a pack-up kit that is required to support detached aircraft operations. The SASS is composed of DLR and FLR items. Authorized SASS require \ments are considered additive to an operating site’s  fixed  allowance. .  The  Weapons  System  Planning  Document (WSPD) is a policy and planning document produced by  NAVAIR.  The  WSPD  provides  the  guidance necessary  for  the  acquisition  and  logistics  support of  naval  aircraft.  The  WSPD  provides  the  number of   aircraft   at   each   site,   levels   of   maintenance capability, pack-up requirements, carrier schedules, rotational aircraft assignments, and approved flying hours. OSI   REQUIREMENTS   DETERMINATION The community approach is used in determining the OSI requirements. This  process  is  used  for  both repairable and consumable items as described in the following  paragraphs. Consumable Items In   a   community   approach,   consumable requirements  are  determined  by  using  the  Ship’s AVCAL  Asset  Demand  Tape  (SAVAST)  from  carriers that  are  supporting  the  same  aircraft  and  equipment, including those undergoing re-AVCAL. This method is  designed  to  maximize  the  range  for  irregular demand   patterns. This  method  also  minimizes  the establishment of new items for the purpose of recording its  number  of  demands.  The  community  SAVAST process   includes   taking   data   from   four   recently deployed aircraft carriers and data characteristics off the SAVAST   undergoing   re-AVCAL   and   creating,   a combined SAVAST. Items on the SAVAST that have positive  average  monthly  demand  (AMD)  and  are  not applicable in NAVICP-Phil tiles are included in the preliminary   products. Repairable  Items A  new  technique  has  been  implemented  to determine   the   repairable   fixed   allowances   for carriers/amphibious  ships.  Essential]  y,  the  collective 3-M  experience  gained  from  recently  deployed  aircraft carriers is used as the basis to determine the baseline fixed  allowance.  In  this  manner  the  usage  experience during deployment of all aircraft carriers is considered rather  than  that  of  a  single  carrier.  Baseline  fixed allowance is considered the standard aircraft carrier allowance and is incorporated into the preliminary AVCAL.  Changes  to  the  baseline  fixed  allowance formulate the basis of negotiations at the AQRC. Initial  Outfitting The  ARR  columnar  quantity  is  selected  for  AVCAL inclusion   for   weapons   systems   not   previously supported. Applicable Constraints The  attrition  allowance  quantities  for  items  with identical ARR application on the previous and current AVCAL and reflect zero usage will be reduced to one. Protected  aircraft  and  weapons  systems  are  not  subject to constraints. When requested by the type commander, additional  exceptions  to  the  constraint  program  maybe applied. Preliminary  Requirement Stock   levels   developed   from   the   mechanized requirements process are used as the point of departure in  AVCAL  negotiations.  The  established  allowance  or revisions  during  Readiness  Improvement  Program (RIP) reviews will be included into the preliminary AVCAL  and  be  considered  as  NAVICP-Phil recommended   quantities. Readiness  Improvement  Program (RIP) During  the  RIP,  specifically  selected  aircraft/ systems are reviewed to identify logistics problems. As 4-20