controlling  custodian.  The  3M  Aviation  Organization Code  Master  Listing,  NAMSO  4790.A7065-01, provides a complete listing of these codes. The first character of the organization code identifies the major command. The second and third characters identify specific units within the major command. Refer to the NAMP, volume V, appendix K for more information on organization  code  structuring. . Enter the JOB CONTROL NUMBER (JCN) in the  register.  The  JCN  is  a  9-,  10-,  or  11-character alphanumeric  code  that  serves  as  the  base  for  the maintenance data report (MDR) and control procedures. The  JCN  allows  for  separate  identification  of  each maintenance action. Also, it provides a link with the maintenance actions performed by the intermediate maintenance activity (IMA) in support of an activity or an O-level maintenance discrepancy. The JCN consists of four parts. They are the organization code, date, serial number,  and  suffix.  The  paragraph  above  describes  the organization code. The  date is the last three digits of the Julian date. This is the date the JCN was assigned to a maintenance action. It does not necessarily reflect the date when the work started. The serial number maybe a three-digit number that runs sequentially from 001 to 999. Also, it maybe three alphanumeric characters. This number is used in sequence for each new job initiated. After using serial 999, the next number in sequence will be 001. The alphanumeric characters are used only when documenting   inspections   other   than   preflight, postflight,  turnaround,  daily,  special,  conditional, corrosion, and acceptance/transfer. This element may be omitted for initial issues and issues from pre-expended bins. . Enter the TYPE EQUIPMENT CODE (TEC) that describes the end item on which the work is being performed. This is a four-character code that identifies the end item or category of equipment. Refer to the NAMP,   volume   V,   appendix   Q,   for   additional information about this code. . Enter the BUREAU or SERIAL NUMBER of the equipment or item being worked on. If the number is more than six digits, enter the last six. If it is less than six digits, prefix it with zeros to make six digits. This element maybe omitted, if not applicable. . Enter the  WORK  UNIT  CODE  (WUC)  that identifies  the  system,  subsystem,  or  component.  Refer to  the  WUC  manual  for  specific  aircraft  type.  The NAMP, volume V, appendix O, provides a list of general WUC.  This  element  may  be  omitted  for  issues  on technical directive compliance (RECTYP 64). Also, this element may be omitted for initial issues and issues from pre-expended   bins. l Enter the  COMMERCIAL   AND   GOVER- NMENT ENTITY (CAGE) code. This element must contain the engine TEC in lieu of the CAGE when ordering  engines.  Cognizance  symbol  4V  identities engines. . Enter the PART NUMBER of the required item. . Enter the  QUANTITY  needed  to  do  the  work . Enter the PROJECT CODE  assigned. NAVSUP P-437 and P-485 provide a list of project codes. . Enter the proper REQUISITION  PRIORITY DESIGNATOR  according  to  OPNAVINST  4614.1 (series). .   When   required, enter  the  REQUIRED DELIVERY DATE  (RDD). . When needed, enter the  DELIVERY POINT. . Enter the ADVICE  CODE  when  needed.  An advice code is mandatory for repairable items. . Enter the DOCUMENT  NUMBER  assigned from the requisition log. Material for technical directive (TD) modifications are issued and accounted for based on the requirements stated on the TD.TD kits and government-furnished equipment  (GFE)  that  complements  these  kits  are budgeted  and  issued  as  NAVAIR-owned  material.  They are  issued  for  onetime  installation  in  specified equipment during fleet maintenance overhaul, repair, or modification   programs.   The   Naval   Aviation Maintenance   Office   (NAMO)   assigns   the   kit identification  numbers  for  TD  kits  and  GFE.  The purpose for assigning the kit number is for identifying, requisitioning,  and  reporting  the  items.  The  Aviation Supply  Office  (ASO)  maintains  the  records  and  stock balances of the kits for NAMO on the master data file. The daily receipt and processing of transaction item reports (TIR) updates the master data file. If available, use pre-expended bins (PEB) to get the required  items.  PEB  consist  of  low-cost,  frequently used, maintenance-related items. Items stocked in the PEB are already paid for. Issues made from PEB do not create a charge to a squadron’s account. The value of material  in  the  PEB  is  charged  to  the  overhead  of industrial-type activities. At other activities, the value is charged to the accounts chargeable. The purpose of the PEB is to shorten the issue and accounting procedures 8-3