ENGINEMAN  1  &  C drawing  a  single  line  through  the  entry  and recording the correct entry on the following line. Deleted entries are initialed by the EOOW, the OOD, or the watch supervisor, as appropriate. Operating Records and Reports Engineering operating records are meant to ensure regular inspection of operating machinery and  to  provide  data  for  performance  analysis. Operating records are not intended to replace fre- quent  inspections  of  operating  machinery  by supervisory personnel and are not to be trusted implicitly  to  provide  warning  of  impending casualties.  Personnel  who  maintain  operating records  must  be  properly  indoctrinated.  They must be trained to correctly obtain, interpret, and record data, and to report any abnormal condi- tions noted. The  type  commander’s  directives  specify which engineering operating records will be main- tained and prescribe the forms to be used when no  standard  record  forms  are  provided.  The engineer officer may require additional operating records  when  (all  factors  considered—including the burden of added paperwork) he deems them necessary. The operating records discussed in this chapter are generally retained on board for a period of 2 years, after which time they may be destroyed in  accordance  with  current  disposal  regulations. Completed records must be stowed where they will be properly preserved, and in such a manner as to  ensure  that  any  one  of  the  records  can  be easily  located. D I E S E L    E N G I N E    O P E R A T I N G RECORD.—The  Diesel  Engine  Operating Record-all  Ships,  NAVSEA  9231/2  (figures  2-3 and 2-4), is a daily record maintained for each operating  diesel  engine.  In  ships  with  more  than one  main  engine  in  the  same  engineroom,  a separate  record  sheet  is  maintained  for  each operating  engine. The  watch  supervisor  enters  the  remarks  and signs the record for his watch. The petty officer in  charge  of  the  engineroom  or  the  senior engineman checks the accuracy of the record and signs the record in the space provided on the back of the record. Any unusual conditions noted in 2-6 the   record   are   immediately   reported   to   the engineer  officer  and  the  record  is  sent  to  the engineer officer for approval. FUEL  AND  WATER  ACCOUNTS.—The maintenance  of  daily  diesel  fuel,  lubricating  oil, and water accounts is vital to the efficient opera- tion of the engineering department. Forms and procedures necessary to account for and preserve a  limited  supply  of  freshwater  and  fuel  are generally prescribed by the type commanders. Principally,  the  accounts  inform  the  engineer officer of the status of the ship’s liquid load and form  the  basis  of  reports  submitted  to  higher authority by the engineer officer. It  is  fundamental  to  all  naval  operations  that the ship and unit commanders know the exact amount of burnable fuel on hand. When com- puting  the  amount  of  burnable  fuel  on  board, consider  only  the  fuel  in  the  service  and  storage tanks. All the fuel below the fuel suction line is to be considered not burnable. FUEL AND WATER REPORTS.—The Fuel and Water Report, NAVSEA 9255/9 (figures 2-5 and 2-6), is a report submitted daily to the com- manding  officer.  This  report  indicates  the  amount of fuel oil and water on hand as of midnight, the previous day. The Fuel and Water Report also includes the previous day’s feed and potable water performance  and  results  of  water  tests.  The original and one copy are submitted to the OOD in sufficient time for submission to the command- ing  officer  or  command  duty  officer  with  the 1200 reports. The copy is retained by the OOD. MONTHLY   SUMMARY.—The   Monthly Summary of Fuel Inventory and Steaming Hours Report  is  a  comprehensive  monthly  report  of engineering data from which the operating effi- ciency  and  general  performance  of  the  ship’s engineering plant can be calculated (see figure 2-7). Requirements for this report are contained in Fleet Commander Instructions. This report is prepared by the engineer officer and verified, as to fuel receipts, by the supply officer. Then, it is approved and forwarded by the commanding officer directly to the fleet commander. A copy is retained on board in the files of the engineer- ing department. An additional copy of the report may be provided to the type commander.