TM 10-6640-233-10 Section II. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) 2-3. General. The following paragraphs describe general information concerning when to do PMCS and what to do if a failure is discovered. a. Before You Operate. Always keep in mind the CAUTIONS and WARNINGS. Perform your before (B) PMCS prior to the equipment leaving the laboratory or performing its intended mission. b. While You Operate. Always keep in mind the CAUTIONS and WARNINGS. Perform your during (D) PMCS when the equipment is being used in its intended mission. c. After You Operate.  Be sure to perform your after (A) PMCS after the equipment has been taken out of its mission mode or returned to the laboratory. d. If Your Equipment Fails to Operate. Troubleshoot with proper equipment. Report any deficiencies using the proper forms. See DA Pam 738-750. 2-4. PMCS Procedures. The following paragraphs describe your PMCS, Table 2-12. a. Purpose of PMCS Table.  Your PMCS table lists the inspections and care your equipment requires to keep it in good operating condition. b. Item  Number  Column.  Item  numbers  are  assigned  in  chronological,  ascending  sequence  regardless  of  interval designation.  These  numbers  are  used  for  your  "TM  number"  column  on  DA  form  2404,  Equipment  Inspection  and Maintenance Worksheet in recording results of PMCS. c Service  Interval  Column.  The  "Interval"  column  of  your  PMCS  table  tells  you  when  to  do  certain  checks  or services. d. Item   to   be   Inspected   Column.   This   column   lists   functional   groups   and   their   respective   assemblies   and subassemblies. The appropriate check or service procedure follows the specific item to be inspected. e. Procedures  Column.  This  column  of  your  PMCS  table  tells  you  how  to  do  the  required  checks  and  services. Carefully follow these instructions. If you do not have the tools, or if the procedure tells you to, have unit maintenance do the work. f. After  Prolonged  Shutdowns.  Perform  weekly  as  well  as  before  operations  if  you  are  the  assigned  operator  and have not operated the item since the last weekly or if you are operating the item for the first time. g. Reporting  and  Correcting  Deficiencies.   If  your  equipment  does  not  perform  as  required,  refer  to  Chapter  3, Troubleshooting for possible problems. Report any malfunctions or failures on the proper DA Form 2404, or refer to DA Pam 738-750. 2-16