and  issue  information  bulletins  and  directives  for .  Review  ships’  repair  requests  that  are  made guidance  and  assistance. before  shipyard  availabilities.  Decide  on  the  necessity . Recommend to the fleet commander schedules of the work and, if approved, whether the ship’s force, for regular overhauls by a naval or commercial shipyard. a tender, or a shipyard will do the work. Consider the The frequency and duuration of an overhaul depend upon availability of funds and the size of the job in approving the type and size of ships. individual  work  items, l  Maintain  records  of  ship  alterations  and . Make designated ships available to meet regular improvement   programs. overhaul  schedules. l  Assign  restricted  and  technical  availabilities.  Use restricted  availabilities  for  repairs  that  cannot  be deferred until the next regular overhaul, usually caused by   collision,   grounding,   and   breakdowns.   Use technical availabilities for repairs when the ship does not need to be at the repair activity. . Authorize variations in starting dates of 2 weeks or less, extensions of availability of  up to 2 weeks, or early  termination  of  overhauls. .  Assign  and  supervise  upkeep  periods  alongside tenders and repair ships under their command. l  Administer  funds  allotted  for  maintenance  of l Review and take final fleet action on “in-excess” requisitions, requests for changes in allowance (except where changes in military characteristics are involved), and  surveys  of  equipment. Each  TYCOM  has  a  slightly  different  organization, but   all   organizations   are   reasonably   parallel   in operation.  It  is  difficult  to  show  the  organization  of  a typical staff since each one is governed by its own set of   instructions.   The   following   staff   instructions generally  define  the  organization  and  responsibilities  of each  officer.  Also,  there  is  usually  a  set  of  staff instructions and notices that govern details or special contingencies   not   covered   in   the   general   staff instructions. These are equally important. ships under their command. . Recommend to the fleet commander how and DUTIES  OF  STAFF  PERSONNEL when  to  complete  items  in  the  Material  Improvement Plan (Ships) and the Naval Ship Systems Command Ordinary  Alteration  Plan.  The  Material  Improvement Plan is a priority list of alterations that affect the military characteristics of ships. Thc Atlantic and Pacific Fleet commanders review the priority lists, then each submits a single integrated priority list to CNO. The Naval Ship Systems  Command  Ordinary  Alteration  Plan  is  a priority list of alterations that do not affect military characteristics. It uses review procedures similar to those  of  the  Material  Improvement  Plan. . Take final fleet action on proposed alterations that  do  not  affect  military  characteristics.  Ships’ commanding  officers  propose  these  alterations  and submit them to the TYCOM. The TYCOM reviews the proposed alterations and how they may apply to ships of the class in the force. The TYCOM approves those alterations  that are equivalent to repairs and adds them to the alteration and improvement program. .  Make  recommendations  on  alterations  that  affect military  characteristics  to  CNO  via  the  fleet commanders. Either the ships’ commanding officers or TYCOM  staff  may  originate  these  recommendations. The reviews for these recommendations arec similar to those for ordinary alterations. In the absence of the TY’COM, members of the staff handle all routine matters and matters of importance when they know the wishes of the TYCOM. In urgent cases, they should take immediate action on the premise that considered action is preferable to delay. If the matter  is  important,  they  should  inform  the  TYCOM and his chief of staff as early as possible. The following section covers only staff billets that are of primary concern to the engineering duty officer. For  example,  the  TYCOM’s  chief  of  staff  is  not included. Assistant Chief of Staff for Logistics The Assistant Chief of Staff (ACS) for Logistics prepares  the  logistic  plans  for  the  material  and maintenance  support  of  the  command  and  supervises the discharge of those plans. He recommends logistics decisions  to  the  TYCOM,  and  he  prepares  upkeep schedules   and   procedures   and   holds   frequent inspections  to  ensure  those  standards.  To  carry  out  his responsibilities,  he  keeps  close  liaison  with  naval shipyards,  the  reserve  fleet,  locally  assigned contractors’  representatives,  and  supply  depots.  The ACS for logistics has the following responsibilities: 7-4