ensure that the SHIPALTs that support the ORDALTs are  promulgated  by  NAVSEA.  When  the  FMP  is published, NAVSEA is authorized to provide funds, conduct  advance  planning,  and  procure  material  needed for  the  ship  improvements. FMP CHANGES Forces  afloat,  PMs,  and  other  authorities  may request  changes  to  the  approved  FMP  via  the responsible   type   and   fleet   commanders,   with information   copies   to   NAVSEA.   NAVSEA recommends  to  CNO  for  or  against  the  requested changes  in  terms  of  their  effect  on  the  technical schedule, material, cost, and funding feasibility. AUTHORIZATION  FOR  ALTERATIONS (180-DAY LETTERS) During  the  year  in  which  the  money  becomes available, the SLD authorizes the actual alterations programmed  in  the  FMP  by  issuing  the  180-day  letters. These letters are completed and forwarded in time to be received by the ship and the overhauling activity not later than 180-days before the start of the ship overhaul or conversion. The overhaul activity can be either a naval shipyard or a SUPSHIP that deals with private shipyards. The commanding officer should notify the TYCOM, NAVSEA, and the overhaul activity of the authorized SHIPALTs that have been completed on his ship, and those for which material is on board. ADVANCE PLANNING AND LONG LEAD TIME  (LLT)  MATERIAL NAVSEA is authorized to provide funds to PERAs and to overhaul shipyards to finance advance planning and  prepare  for  authorized  SHIPALTs.  These  funds  pay for  design  services,  procurement  of  LLT  incidental installation  material,  prefabrication,  and  intensive overhaul  management. SHIPALT COMPLETION STATUS (SACS) AND SHIPALT RETURN COST ANALYSIS (SARCA) The FMP requires timely and accurate feedback reports.  Those  responsible  for  planning  must  know when SHIPALTs are completed so they can identify any out standing alterations that will be considered for upcoming availabilities. They also need SHIPALT cost returns  from  departure  reports  to  update  FMP dollar/man-day  estimates.  To  get  this  information, SACS  was  implemented  for  CNO  as  the  official reporting charnel for the completion of SHIPALTs. The input  data  for  SACS  comes  from  the  3-M  (MDCS) systems.  When  the  SACS  report  is  published  and distributed, interested commands or agencies should reconcile any differences by direct contact with their TYCOMs. F AND D SHIPALTS We said earlier in this chapter that titles F and D SHIPALTs are automatically added to the FMP, but that TYCOMs   assign   their   priorities.   All   TYCOM alterations must be screened carefully because some alterations are prerequisite for other work that may have to be done before the overhaul start date. For economic reasons,  other  TYCOM  alterations  should  be  done along  with  title  K  SHIPALTs.  The  TYCOM  should review  SHIPALT  packages  that  have  not  been  installed because  of  operational  commitments  and  consider nominating   them   for   installation   during   regular overhauls. All alterations, regardless of finding source, should  be  supported  with  material  and  drawings. Planning or design agents may have to check the ship before  they  can  make  these  drawings.  Also,  TYCOMs may need to make the ship available for further ship checks  so  the  overhauling  activity  can  prepare supplemental  drawings.  Frequently,  a  preoverhaul inspection  will  identify  a  need  for  alterations.  A preoverhaul inspection should be conducted well in advance  of  the  overhaul  to  allow  time  to  process SHIPALTs needed to correct defective items. CORRECTION AND UPDATING OF DOCUMENTATION Between  regular  overhauls,  a  planning  agent corrects  and  updates  documentation  on  the  ship’s condition.  During  an  overhaul,  the  shipyard  must provide  or  revise  documentation  that  reflects  the  ship’s condition as it leaves the shipyard. The end users of the product  are  forces  afloat.  They  will  validate  technical manuals,  drawings,  and  selected  record  data  and drawings. The planning agent can correct errors found in the ship drawing index and in selected record data and drawings. Other errors may be corrected by pen and ink  pending  the  next  overhaul  update.  When  fleet personnel  find  differences  between  the  documentation and the product, they should inform NAVSEA. 7-20