INTRODUCTION TO SONAR 



maintenance actions in substantial detail so that 

 a variety of information may be collected con- 

 cerning maintenance actions and performance 

 of equipment. In addition to the foregoing informa- 

 tion, MDCS furnishes data oninitialdiscovery of a 

 malfunction, how equipment malfunctioned, how 

 many man-hours were expended on its repair, 

 equipment involved, repair parts and materials 

 used, delays incurred, reasons for delay, and 

 the technical specialty or work center that per- 

 formed the maintenance. 



In recording maintenance actions, codes must 

 be used in order to convert information to a 

 language that can be read by automatic data 

 processing machines. Codes are listed in the 

 equipment identification code (EIC) manual. Third 

 class petty officers are required to prepare 

 numerous maintenance forms, using appropriate 

 EICs. These forms are sent to a data processing 

 center where coded information is punched onto 

 cards, which then are machine-processed to 

 produce various reports for use in maintenance 

 and material management. 



Reports coming from the automatic data 

 processing machines are accurate and useful 

 only if information is entered clearly and cor- 

 rectly on maintenance forms. All codes supplied 

 on the forms must therefore be accurate and 

 clearly written. 



The MDCS requires that coded entries be 

 made on OpNav forms 4700-2B (shipboard main- 

 tenance action), OpNav form 4700-2C (work re- 

 quest), and OpNav form 4700-2D (deferred action). 

 Detailed descriptions of entries for these forms 

 appear in the EIC manual and in chapter 3 of 

 the 3-M Manual . OpNav 43P2. 



POMSEE PROGRAM 



Although the 3-M system has been imple- 

 mented in all major type commands, some ships 

 do not yet have the system in operation, or only 

 part of the system. Aboard ships that do not 

 have any part of the 3-M system in operation, the 

 old POMSEE program still must be carried out. 

 The short title POMSEE is formed from the 

 underlined letters of the term Performance, 

 Operation, and Maintenance Standards for Elec- 

 tronic Equipment. This title is an accurate 

 self-description of the contents of POMSEE 

 publications. The POMSEE publications include 

 Performance Standards Sheets and Maintenance 

 Standards Books for electronic equipment. 



Performance standards sheets are filled out 

 by technicians when equipment is installed and 



immediately after it is overhauled. A minimum 

 value is set by the cognizant command for certain 

 performance characteristics that must be obtained 

 before the equipment is considered satisfactory. 

 Maintenance Standards Books provide methods 

 for measuring the performance of a specific 

 equipment. These books have space for recording 

 the measurements, and give a preventive main- 

 tenance schedule for the equipment. The Main- 

 tenance Standards Books do not tell how to 

 locate trouble in the equipment. The applicable 

 technical manuals must be consulted for methods 

 and practices of troubleshooting. Maintenance 

 Standards Books are in two parts: Part I— 

 Reference Standards Tests, and Part II — Pre- 

 ventive Maintenance Checkoff. 



Part I contains itemized step-by-step pro- 

 cedures for making tests, enabling the person 

 making the test to record significant operating 

 values taken while the equipment is operating at 

 peak efficiency. Upper and lower limits or 

 tolerances are given so that an indication is 

 immediately apparent if performance falls below 

 the prescribed limits. Illustrations are included 

 to show test point locations. 



Part II contains maintenance steps that must 

 be performed at regular intervals. These steps 

 include tests on circuits and components, and 

 they specify what and when other routine main- 

 tenance (such as lubrication) should be accom- 

 plished. Part II enables the operating personnel 

 to perform checks and preventive maintenance 

 in a systematic manner. In general, the steps 

 outlined in part II are the same as those used 

 in part I to establish the values representing 

 equipment operation at peak efficiency. All checks 

 should be performed by the operating personnel 

 insofar as possible. 



A distinction between performance standards 

 and reference standards should be pointed out 

 at this time. 



Performance standards set forth in the per- 

 formance standards sheets must be met when 

 equipment is installed. When it is established that 

 the equipment meets the performance standards, 

 reference standards ai'e taken by a qualified 

 person and are entered in ink in the reference 

 standard column in part I of the Maintenance 

 Standards Book. 



Upon completing each preventive maintenance 

 check prescribed, results should be entered in the 

 time schedule table accompanying each chart. 

 Entries in these tables are of prime importance, 

 because they indicate whether the equipment is 

 performing at maximum efficiency. Comparison 



152 



