back of the record for the daily signature of the engineer officer. AIR COMPRESSOR OPERATING RECORD REFRIGERATION/AIR  CONDITIONING EQUIPMENT  RECORD The  Refrigeration/Air  Conditioning  Equipment Operating  Record,  NAVSEA  9516/1  (fig.  2-7),  is  a complete  daily  record  for  each  operating  refrigeration plant  and  air  conditioning  plant  (except  package units). Spaces on the front of the record are for entries applicable to both refrigeration and air conditioning plants (view A of fig. 2-7). The entries made on the back   of   the   record   are   illustrated   in   view   B   of figure  2-7  (air  conditioning).  Note  that  data  are recorded  at  2-hour  intervals  in  this  record.  The  A division officer reviews the contents and initials the record  daily. GYROCOMPASS  OPERATING  RECORD The Gyrocompass Operating Record is a locally prepared,  complete  daily  record  for  each  operating master  gyrocompass.  The  form  for  the  log  is  prepared according   to   the   type   commander’s   directives. Columns  in  the  log  should  provide  space  for recording  the  times  of  starting  and  stopping  the gyrocompass, total hours of operation since delivery of  the  gyrocompass,  and  important  operating  data pertaining  to  the  gyrocompass  installation,  The  petty officer in charge of the interior communications (IC) equipment  checks  the  accuracy  of  the  log  and  the electrical officer notes its contents daily. IC ROOM OPERATING RECORD The IC Room Operating Record is a daily record of major electrical equipment in operation in the IC room and is maintained by the IC watch. The form for the record  is  prepared  locally  according  to  the  type commander’s   directives.   On   small   ships   the gyrocompass  log  and  the  IC  room  record  may  be maintained on the same form. Important data such as voltages  and  currents  of  major  units  of  IC  equipment (IC switchboard, telephone switchboard, and motor generator sets) should be recorded on the form. The IC Room Operating Record is checked and approved in the manner  described  for  the  Gyrocompass  Operating Record. Some  large  ships  maintain  an  Air  Compressor Operating  Record  that  contains  important  data  such  as temperatures   and   pressures   pertaining   to   air compressors  in  operation.  When  required  by  the  type commander,  the  Air  Compressor  Operating  Record  is prepared  locally  according  to  his  directives.  Contents  of the record should be checked by the petty officer in charge  of  the  air  compressors  and  the  appropriate division  officer. FUEL AND WATER ACCOUNTS The  maintenance  of  daily  fuel  oil,  lubricating  oil, water, and diesel oil accounts is vital to the efficient operation of the engineering department. The type commander generally prescribes forms and procedures necessary to account for and preserve a limited supply of fresh water and fuel. Chapter 090 of the NSTM lists the fuel and water accounts that the Naval Sea Systems Command (NAVSEASYSCOM) considers indispensable   to   the   engineering   department. Principally, these accounts inform the engineer officer of the status of the ship’s liquid load. They also form the basis  for  several  important  reports  submitted  to  higher authority  by  the  engineer  officer.  One  of  the  most important  of  these  is  the  report  of  the  amount  of burnable fuel on hand. It is fundamental to all naval operations that all ship and  unit  commanders  know  the  exact  amount  of burnable  fuel  on  hand.  It  is  sound  engineering  practice to fill all fuel oil tanks to 95 percent of volumetric capacity  to  allow  for  expansion  and  to  prevent  spillage. When submitting fuel reports, the 95 percent volumetric capacity of the tank is assumed to be 100 percent of the burnable fuel. It is possible, however, to fuel above the 95 percent volumetric capacity. When fueled to 100 percent  volumetric  capacity,  the  burnable  fuel percentage figure will exceed 100 percent. The engineer officer should not hesitate to report burnable fuel in excess of 100 percent when this amount is actually on board. When  computing  the  amount  of  burnable  fuel  on board, only the fuel oil in storage tanks and service tanks is considered and only if it is above the service suction and transfer suction tailpipes. Fuel below those pipes is not considered burnable. The design height of suction tailpipes is shown on ship’s plans. The fuel oil in  contaminated  tanks  (settling  or  separating  tanks), also is not considered burnable. 2-14