When  Discovered  code.  The  When  Discovered code is a one-character, alphabetic code that identifies when the need for maintenance was discovered. Transaction  code.  The  transaction  code  is  a two-character, numeric code that shows the type of data being reported. Time/Cycle Prefix code. The Time/Cycle block is made up of a prefix and four numerical digits. The prefix indicates the source of time (usually in hours), cycles, or counts (rounds fired, number of catapult launches, or arrested landings). All entries in the Time/Cycle block are preceded by a prefix code. Some examples of these codes are as follows: A—indicates aircraft time and is used to report removal/installation  of  equipment  not  having  an hourmeter   installed   or   Aeronautical   Equipment Service Record (AESR) or an SRC card maintained. E—indicates engine time (logbook time since overhaul). L—landings. M—indicates meter time. N—rounds  fired. All entries in these blocks must be five digits. For example, report 27 hours type-equipment time as A0027. If the time exceeds 9,999 hours, record the last four digits only. For example, 10,231 hours would be recorded as A0231. Awaiting Maintenance Reason code (AWM).  The AWM code is a one-digit, numeric code used to show the reason no maintenance is being performed. Q48. Q49. Q.50. Q51. Q52. Q53. Q54. What  components  create  the  Job  Control Number (JCN)? What is indicated by a JCN suffix? What is a Work Unit Code (WUC)? What  code  describes  the  maintenance  performed on an item identified by a WUC? What  is  the  proper  name  for  what  most technicians refer to as the Manufacturer ’s code? What is a Malfunction code? How many positions complete the Time/Cycle block  on  a  VIDS/MAF? SE RECORDS, FORMS, AND DOCUMENTS LEARNING  OBJECTIVE:  Identify  the records, forms, and documents used for support equipment (SE) maintenance management and their purposes. Throughout the operational life of an end item of SE, many records, forms, and documents are generated for the support and management of that particular item.  The  following  records,  forms,  and  documents (which effect transfer of SE) are used to obtain and maintain  the  history  of  operation,  maintenance,  and configuration  status. SE CUSTODY AND MAINTENANCE HISTORY RECORD, OPNAV 4790/51 This  form  is  used  to  record  acceptance information,  custody  and  transfer,  rework, preservation and depreservation, and TDs. It also includes  a  record  of  periodic  maintenance  performed by hours, starts, date completed, next PM due, activity and signature. It accompanies all items of SE that have formal   periodic   maintenance   requirements;   for example,  MRCs,  MIMs,  handbook  of  service instructions, manufacturer’s handbook, and applicable TDs. Exceptions are precision measuring equipment (PME), engine test cells and stands, and GB1As (these items have their own records). However, those items of  PME  that  have  formal  periodic  maintenance requirements, in addition to calibration requirements, will require this form; for example, versatile avionics shop test (VAST) stations. Reporting custodians retain the  latest  completed  copy,  the  current  copy,  and transcribe accumulated data on initiation of each new record  (fig.  1-12).  This  form  accompanies  weapons and  support  equipment  (WSE)  to  the  weapons department when subcustodied from AIMD. You can find an example of the form, along with step-by-step instructions,  in  OPNAVINST  4790.2. Q55. Q56. Q57. What form is used to document preservation of support equipment? Are  SE  Custody  and  Maintenance  History Records, OPNAV 4790/51, used to document rework maintenance on an engine test cell? Who retains the latest completed copy of the SE Custody and Maintenance History Record, OPNAV 4790/51? 1-23