a result of the RIP, some allowances at an operating site may or may not get adjusted. Increases in depth and additions  to  the  range  to  the  ship’s  allowance  are implemented  during  the  re-AVCAL. Preliminary AVCAL Aids The Naval Inventory Control Point-Philadelphia (NAVICP-Phil)   forwards   the   preliminary   AVCAL review  aids  to  the  applicable  ship  and  cognizant TYCOM 45 days before the scheduled conference date. AVCAL Quality Review Conference (AQRC) The  NAVICP-Phil  convenes  the  conference  to negotiate  the  allowance  requirement  of  the  operating site. The information in the site’s maintenance data collection system is the primary element in negotiations of  repairable  items. The  information  includes  the number of items processed as BCM, items repaired, and the TAT of repairs. The NAVICP-PMI adjusts the preliminary  requirement  levels  to  reflect  the  negotiated allowance.  Authorized  changes  will  be  incorporated  in the final AVCAL products that are forwarded to the operating  site. NOTE:  The  ACR-F  is  used  to  request  an  increase or decrease in allowance after the re-AVCAL. Miscellaneous  Requirements Other  OSI  requirements  include  the  industrial support  package  (ISP)  and  the  supplemental  aviation spares support (SASS). The ISP is designed to provide an 8-month range and depth support for an aircraft carrier’s LRCA and is currently incorporated in the community SAVAST. The SASS is supplemental and not additive to the operating  site’s  AVCAL  quantity.  These  requirements are based on several factors, as follows: The  level  of  repair The   number   and   type(s)   of   aircraft   to   be supported Predicted  removals The flying hours expected over an endurance period LEVEL OF REPAIR.—  OverhauI,  repair,  and maintenance of aeronautical material and weapons systems  are  performed  within  the  broad  guidelines  of three   levels   of   maintenance. They  are  the organizational, intermediate, and depot levels. A list of aircraft   maintenance   functions   classified   to   the maintenance  levels  is  provided  in  OPNAV  Instruction 4790.2.  It  is  important  that  you  have  a  thorough knowledge  of  the  maintenance  that  can  be  performed by  your  particular  activity. Organizational Maintenance.— The  classifica- tion   of   O-level   maintenance   is   applied   to   those maintenance  functions  normally  performed  by  an operating  unit  on  a  day-to-day  basis  of  its  own operation.  O-level  maintenance  can  generally  be grouped  to  include  aircraft  inspections:  servicing, handling,  removal  and  replacement  of  defective  parts and   components;   aircraft   service   changes   and modifications;  and  necessary  recordkeeping  and  reports peculiar to O-level maintenance. Intermediate   Maintenance.—   The   I-level maintenance includes the repair and test of aircraft components  and  items  requiring  shop  facilities  and/or skills   and   equipment   not   available   in   O-level maintenance  activities. Incorporation  of  aircraft service  changes  and  modifications  beyond  O-level capabilities is also a function of I-level maintenance. Depot   Maintenance.—   The  classification  of D-level  maintenance  is  applied  to  those  functions performed at industrial-type activities such as naval aviation depots (NADEPs). The NADEPs are normally located at major air stations and perform overhaul and major rework on aircraft, engines, and components on a scheduled basis as directed by NAVAIR. They also perform  a  customer  service  program  for  nonscheduled overhau/repair on components to satisfy not mission capable  supply  (NMCS)  requirements. Change  of  Maintenance  Level.—  When  the maintenance level designation of an activity is changed, the range of supporting repair parts carried in stock as well as the equipment is involved. A change to a higher level of maintenance requires additional spare repair parts. It is also possible that the supply level could be changed at the same time. Each NAVAIR outfitting and allowance list in use is screened carefully to make sure that all items required to support the  higher  level  are  procured. A change to a lower maintenance level involves almost  the  same  steps  except  in  reverse  manner.  Many of the items required for support of a higher level are no longer required or allowed. Therefore, they must be returned to the supply system, and the equipment will normally be transferred to another activity for use. 4-21