that is performed on aircraft. OMAs perform only servicing and preoperational inspections on assigned SE. IMAs perform all functions that relate to minor adjustments, removal and replacement of minor parts, periodic inspections, and removal and replacement of components. IMAs have intermediate maintenance responsibility for all SE that is checked out on a subcustody basis. Sets of MRCs for each major type of SE make inspections and repairs easier. These card sets are updated as a result of SE maintenance experience. When the sequence found in the card sets is followed, the minimum inspection requirements of the equipment are satisfied. MRCs specify the requirements for preoperational inspections that are performed by the supporting ship or the AIMD of the station. If all of the support equipment programs presently in use by the Navy were presented here, a complete book would be needed to explain them. To keep the discussion to a minimum, SE inventory data reporting and of maintenance and custody records is emphasized. It is with these types of records that you, the AZ, will be primarily involved. You should keep an accurate maintenance history and custody or subcustody record on each unit of SE for which MRCs are provided. SE Custody and Maintenance History Record The SE Custody and Maintenance History Record, OPNAV 4790/51 (figs. 5-27, 5-28, 5-29, and 5-30) is used to record information on acceptance, custody and transfer, record of rework, preservation and depreservation, TD compliance, and other miscellaneous history information that should accompany an SE item throughout its service life. The OPNAV 4790/51 record should accompany all items of SE that have maintenance requirements and applicable technical directives, for example, MRCs and MIMs. The only exceptions are precision measuring equipment (PME), engine test cells, and engine test stands. OPNAV 4790/51 cards provide a record of each periodic maintenance requirement (inspection), the date that the requirement was completed, the due date of the next periodic maintenance (PM), the activity that accomplished the PM, and the signature of the person who is authorized to make entries. When an OPNAV 4790/51 card contains no space for further entries, a new card is initiated. Accumulated data is then transcribed to the new card. Reporting custodians should retain the latest completed copy and along with the current copy of the record. SE Preoperational Record The work center that performs preoperational inspections holds the SE Preoperational Record, OPNAV 4790/52, in a card file or filing container. The activity that has physical custody of the SE makes the entries in the record. Entries reflect all preoperational inspections performed. This form is also used when SE is issued or received on a subcustody basis. The reporting custodian issues a new card when the card in use is completely filled. Support Equipment Standardization System The Support Equipment Standardization System (SESS) is a computer-based asset control system that tracks inventory of SE. SESS, used in conjunction with NALCOMIS, provides an electronic method for scheduling periodic maintenance, subcustody management, technical directive accounting, and inventory management. For detailed information on SESS, refer to the SESS User’s Guide. NOTE: When the SESS asset control system is not available, the SE Transaction Report, OPNAV 4790/64, is used to record SE issue and receipt transactions. When SE is issued on a subcustody basis, the user signs the transaction report (TR) in the inspector block. The issuing activity retains the white, green, and yellow copies of the TR for local record-keeping purposes. The using activity retains the pink copy for its records. When SE is returned to the reporting custodian (usually the IMA), the supervisor’s block of the TR is signed by receiving personnel. All of the discrepancies that are noted during issue, receipt, or preoperational inspections should be annotated on a MAF by IMA production control. HISTORICAL FILES Most of the forms, records, and reports that you as an AZ will complete will have some type of retention requirement. That is, the original form, records, and reports must be kept on file for a certain period of time in case the need arises to refer back to these documents. No longer are only paper copies of documents retained on file. With computer-based systems such as NALCOMIS and SESS, electronic copies of source documents (data tapes, databases, and so forth) are maintained on file and have retention requirements. In the following paragraphs, we will discuss some retention periods of some of the more common records and forms. For retention requirements for forms, records, and reports not listed, refer to appendix B in the NAMP. 5-40