MAJOR ENGINE INSPECTION—A comprehen- sive inspection performed to determine the material condition of the engine. This inspection is performed with the engine removed from the aircraft. MAL CODE—Malfunction Description Code—A three-character numeric or alphanumeric code, is used to describe the malfunction occurring on or in an item identified by a WUC. MAN-HOURS—The total number of accumulated direct labor hours (in hours and tenths) expended in performing a maintenance action. Direct maintenance man-hours are man-hours expended by assigned personnel to complete the work described on the source document. This includes the functions of preparation, inspection, disassembly, adjustment, fault correction, replacement or reassembly of parts, and calibration/tests required in restoring the item to a serviceable status. It also includes such associated tasks as checking out and returning tools, looking up part numbers in the IPB, transmitting required information to material control, and completing documentation of the MAF. MANAGEMENT—A general term to denote central executive direction and control of work by an individual or organization specifically assigned and funded to accomplish the function. MANUFACTURER—Individual, company, firm, corporation, or government activity engaged in the fabrication of finished or semifinished products. MATCHED SET—A group of two or more separate components that function together in a single system and are normally removed, repaired, checked, adjusted, calibrated, and installed together. Replacement of a single component of a matched system normally requires check/ adjustment/calibration of the matched set. MATERIAL—All items necessary for the equipment, maintenance, and support of military activities without distinction as to their application for administrative or combat purposes, excluding ships or naval aircraft. MATERIAL COGNIZANCE CODES—A two- character, alphanumeric code which denotes responsibility for exercising supply management over items or categories of material. MATERIAL CONDITION—Reporting status with respect to SCIR. MATERIAL REPORTING—The procedure whereby all supply action documents in support. of maintenance are key entered. MC—Mission Capable—Material condition of an aircraft that can perform at least one and potentially all of its missions. MC Hours = EIS Hours - NMC Hours. MCN—Maintenance Action Form (MAF) Control Number—A serial number assigned to each maintenance action. The MCN is system generated under NALCOMIS. MCRS—Material Condition Reporting Status. MDBA/A—Maintenance Data Base Administrator and Analyst. MDR—Maintenance Data Record or Maintenance Data Report/Reporting. MDS—Maintenance Data System. MEASURE—Metrology Automated System for Uniform Recall and Reporting—A metrology system for the recall and reporting of test equipment by means of ADP techniques, maintains records of calibration and automatically recalls items when due for calibration. MECFA—Maintenance Engineering Cognizant Field Activity. MEPP—Mobile Electric Power Plant. MESM—Mission Essential Subsystem Matrix— Published in OPNAVINST 5442.4, lists, for each model, the equipment systems/subsystems that must be on board and in working order before an aircraft can qualify as mission ready. METER CARD—Metrology Equipment Recall Card—Source document used to update the MEASURE. All actions to PME/TAMS are reported to MEASURE via METER CARDS. METER READING—Meter readings apply to only those items that have a clock/meter installed. Readings will be in time, cycles, or starts to the nearest whole number. METROLOGY —The science of measurement or determination of conformance to technical requirements, including the development of standards and systems for absolute and relative measurements. MF—Mobile Facility—A relocatable tactical shelter, and its related equipment. The principle applica- AI-15