in the engine room shows the time that control is taken by the engine room. Similarly, the last entry made by engine-room  personnel  shows  when  control  is  shifted  to the bridge. When the Bell Book is maintained by the bridge personnel, it is signed by the officer of the deck (OOD). Alterations or erasures are not permitted in the Bell Book.  An  incorrect  entry  is  corrected  by  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  used  to  ensure regular  inspection  of  operating  machinery  and  to provide   data   for   performance   analysis.   Operating records  do  not  replace  frequent  inspections  of  operating machinery   by   supervisory   personnel   nor   do   they necessarily  warn  of  impending  casualties.  Personnel who  maintain  operating  records  must  be  properly trained  to  correctly  obtain,  interpret,  and  record  data, and to report any abnormal conditions. The  type  commander’s  directives  specify  which engineering operating records must be maintained and prescribe the forms to be used when no standard record forms  are  available.  The  engineer  officer  may  require additional operating records when he or she deems them necessary. The operating records discussed in this chapter are generally retained on board for a period of 2 years, after which  they  may  be  destroyed  according  to  current disposal  regulations.  Completed  records  must  be  stowed so  they  will  be  properly  preserved  and  can  be  easily located. Diesel Engine Operating Record The  Diesel  Engine  Operating  Record-All  Ships, NAVSEA 9231/2 (figs. 1-1 and 1-2), is a daily record maintained  for  each  operating  diesel  engine.  In  ships with  more  than  one  main  engine  in  the  same  engine room,  a  separate  record  sheet  is  maintained  for  each operating  engine. The watch supervisor enters the remarks and signs the  record  for  his  or  her  watch.  The  petty  officer  in charge  of  the  engine  room  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 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 operation of the   engineering   department.   Forms   and   procedures necessary   to   account   for   fresh   water   and   fuel   are generally prescribed by the type commanders. The accounts tell the engineer officer the status of the ship’s liquid load and form the basis of engineering reports  submitted  to  higher  authority. Ship  and  unit  commanders  must  know  the  exact amount of burnable fuel on hand. When you compute 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 considered not burnable. Fuel and Water Reports The Fuel and Water Report, NAVSEA 9255/9 (rev. 2-80) (figs. 1-3 and 1-4), is a report submitted daily to the   commanding   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 consumption figures and results of water tests. The original and one copy  are  submitted  to  the  OOD  in  sufficient  time  for submission to the commanding 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, CINCLANTFLT 3100-4, is a comprehensive  monthly  report  of  engineering  data. These data are used to calculate the operating efficiency and  general  performance  of  the  ship’s  engineering  plant (see fig. 1-5). Requirements for this report are contained in  fleet  commander  instructions.  The  engineer  officer prepares the report, has the supply officer verify the fuel receipt  figures,  and  forwards  it  to  the  commanding officer. The commanding officer approves the report and sends it directly to the fleet commander. One copy is retained  on  board  in  the  files  of  the  engineering department.  An  additional  copy  of  the  report  may  be provided to the type commander. The  Monthly  Summary  includes  the  ship’s  fuel receipts  data,  fuel  consumption  and  steaming  hours necessary  to  establish  monthly  financial  obligations, 1-3