ship  to  operate  all  its  information  processing  systems according to prescribed procedures. Because of its cost, this survey is usually completed on only one ship of a class. The second inspection is the Visual TEMPEST Configuration Control Inspection (VTCCI), which is conducted  independently  or  concurrently  with  the instrumented TEMPEST survey, to determine whether or  not  the  shipboard  secure  electrical  information processing systems are installed properly. Any change, however  minor,  within  the  secure  electrical  processing center,  whether  by  forces  afloat  or  the  normal installation  activity,  must  be  made  and  inspected according  to  current  criteria  outlined  in  MIL-STD-1680. PREOVERHAUL TEST AND INSPECTION (POT&I) Preoverhaul inspections are held approximately 10 to 12 months before an overhaul. These inspections cover  work  on  combat  system  items  to  be  done  during the  upcoming  overhaul.  A  preoverhaul  inspection provides  information  used  in  developing  plans  for overhaul   of   the   ship.   Personnel   performing   this inspection  are  normally  from  the  ship's  home  yard. Personnel   from   SPAWAR   or   NAVSEA   may   also perform part of the inspection. POSTOVERHAUL  INSPECTION The  purpose  of  the  pxtoverhaul  inspection  is  to furnish the commanding officer of the ship a report on the  condition,  capabilities,  and  limitations  of  the shipboard  equipment  and  systems.  This  inspection includes  new  installations  of  equipment  and  systems, and the equipment or systems that were included in the overhaul job orders. MAINTENANCE PERIODS, OVERHAULS, AND ALTERATIONS Maintenance  periods  (also  called  availabilities)  and overhauls  are  scheduled  at  various  times  according  to the needs of the ship, the fleet, the type of ship, and the available  funds. Regular overhauls are normally scheduled about every 60 months. Doing the required heavy maintenance and overhauls that cannot be tended to while the ship is underway usually takes 2 to 6 months. During this time, many new electronics installations and equipment or system overhauls can be done with the assistance of yard,  tender,  or  civilian  contract  personnel. FLEET MODERNIZATION PROGRAM (FMP) The  fleet  modernization  program  is  a  major  effort to ensure that ships of the fleet are as ready as possible to  meet  operational  requirements. Each year the Navy re-evaluates its missions and the threat faced by its forces. Analysis of these factors leads to  a  new  statement  of  required  operational  capability (ROC) in the new projected operational environment (POE) for each class of ships. The new ROC and POE are   then   used   as   the   basis   for   determining   the characteristics required in new ships to be built and the requirements  for  modifying  and  modernizing  existing ships.  Attaining  the  required  operational  capabilities  to enable every ship to best carry out its assigned missions is the primary goal that drives the fleet modernization program  (FMP).  Other  major  supporting  goals  served by  the  FMP  include  increasing  fleet  readiness  by improving safety, repair, habitability, reliability, and maintainability; and accomplishing the highest priority alterations in the most timely manner. The FMP needs are reviewed and updated annually by both the CNO and TYCOM.  This  forms  the  approved  class  improvement plan for each ship class. AVAILABILITIES An availability is an assignment of a ship to a repair facility for repairs beyond the capability of the ship’s force.   Besides   regular   overhaul,   several   types   of availabilities are assigned, according to the needs of the individual ship or the fleet. Restricted Availability (RAV) A  restricted  availability  (RAV)  is  normally  assigned for emergency repairs of problems with prime systems that prevent the ship from fulfilling its mission. When emergency repairs to primary systems cannot be made by ship’s force, the commanding officer can request the type  commander  to  assign  a  restricted  availability  for the repair of these specific systems. During a restricted availability, the ship is rendered incapable of performing its  mission. Technical Availability (TAV) A technical availability (TAV) is used when repairs on noncritical systems or equipment must be made by a repair  facility  or  yard.  These  repairs  do  not  affect  the ability of the^- ship to complete its mission. If necessary, 2-20