the  ship  can  get  underway  without  the  system  or equipment  being  repaired Intermediate  Level  Maintenance  Activity Availability   (IMAV) Intermediate   level   maintenance   activity availabilities (IMAVs) involve repairs made by either afloat repair activities (tenders and repair ships) or shore intermediate  maintenance  activities  (IMAs).  Their purpose is to accomplish as much intermediate level maintenance  and  repair  work  as  possible  within workload  limitations,  available  finds,  and  the  relative priority of the required work. Although the primary emphasis of IMA effort is on repair work authorized SHIPALTs and AERs are undertaken as IMA workloads permit. Upkeep  Period The upkeep period is a period of time in a port where the facilities of a yard or tender are available for routine maintenance  that  cannot  be  done  while  the  ship  is underway.  Upkeep  scheduled  with  the  assistance  of  a tender  or  repair  ship  is  sometimes  called  tender availability. Voyage  Repairs Voyage repairs are emergency repairs that must be made to enable a ship to continue on its mission and which can be done without requiring a change in the ship’s  operating  schedule  or  the  general  steaming  notice in effect. These repairs normally cannot be made by ship’s  force. SHIPYARD  OVERHAUL Ships  are  assigned  availabilities  at  shore-based repair  activities  as  directed  by  the  Chief  of  Naval Operations. The first scheduled overhaul is normally granted to a ship after an initial operating period of about 2 years. Thereafter, scheduled overhauls depend on the ship type. The amount of time in the shipyard for these overhauls varies. If the shipyard works on a one-shift basis,  the  overhaul  often  requires  6  months  or  longer, depending  on  the  type  of  ship.  The  employment schedule,  an  operating  directive  furnished  by  the  type commander,  indicates  when  a  ship  is  scheduled  for overhaul. Availability Work Package Development and Modification For an availability to be a success, the work to be done must be clearly defined in sufficient time to order material and to issue the necessary job orders or contract specifications.  The  definition  of  work  required  is obtained from the ship’s database, as reflected in the Current Ship’s Maintenance Project (CSMP), and from the   results   of   preoverhaul   tests   and   inspections (POT&I). The work package is developed through a sequence of events that starts with the ship’s CSMP and results in an authorized work package control document and the ship  alteration  and  repair  package  (SARP).  The development  of  the  SARP  is  as  follows: Step 1. Step  2. Step  3. Step  4. Step  5. CSMP validation.–The CSMP undergoes formal review to ensure its accuracy and completeness.  This  is  the  responsibility  of the ship; however, external assistance is generally provided to enhance the effort. The  CSMP  provides  the  biggest  input  into the development of the SARP. Preoverhaul   tests   and   inspections (POT&Is).–These     identify     work     not previously  covered  in  the  CSMP.  (They  also define   more   clearly   the   CSMP   work requirements.) TYCOM  screening  of  the  CSMP  and  work identified   by   POT&Is.–Work   may   be assigned  to  off-ship  activities  or  ship’s force,  or  may  be  deferred  until  a  later availability. Some categories of work will be  authorized  immediately  to  allow advanced planning (ordering of material and estimating of the work package). Other  POT&Is  designated  by  the  TYCOM and   the   concurrent   development   of estimates  by  the  naval  shipyard  or S u p e r v i s o r     o f Shipbuilding (SUPSHIPS).–At  this  time,  in  preparing  for the Work Definition Conference, the ship must  place  in  priority  order  all  work requirements  that  have  been  screened  but not  yet  authorized. Maintenance  Work  Definition  Review (complex   overhaul   [COH]/selected restricted   availability   [SRA]).–This meeting is scheduled by the TYCOM and held aboard ship with the planning and estimating  group.  The  POT&I  information 2-21