B.5. EXPLANATION OF COLUMNS IN TOOLS AND TEST EQUIPMENT REQUIREMENTS, SECTION III

TM 1-1520-238-23 B-6 GROUP NUMBER DESCRIPTION 13 Environmental Control Systems (ECS) Heaters, air conditioners, defrosters, control mixing valves, and ducts. 14 Hoists and Winches Cargo/rescue hoists, winches, hooks, slings, loading systems, and emer- gency release systems. 15 Auxiliary Power Unit (APU) Fuel, exhaust, and ducting. GROUP NUMBER DESCRIPTION 16 Mission Equipment Spraying equipment, stores, racks, armament, reconnaissance, photog- raphy pods, and litters. 17 Emergency Equipment Ejection seats, canopies, jettison system, portable fire extinguishers, axes, and first aid kits. 18 Installed Avionics Components Communications and navigational black boxes. b. Maintenance Function (Column 3). Column 3 lists the functions to be performed on the items listed in column 2. c. Maintenance Levels (Column 4). The maintenance levels AVUM, AVIM, and DEPOT are listed on the Maintenance Allocation Chart with individual columns that include the work times for maintenance functions at each maintenance level. Work time presentations such as “0.1” indicate the average time (expressed in man-hours in whole hours or decimals) it requires a maintenance level to perform a specified maintenance function. If a work time has not been established, the columnar presentation shall indicate “–.–”. Maintenance levels higher than the level of maintenance indicated are authorized to perform the indicated function. d. Tools and Equipment Reference Code (Column 5). Column 5 specifies, by code, those common tool sets (not individual tools), common TMDE, and special tools, special TMDE, and special support equipment required to perform the designed function. e. Remarks Code (Column 6). When applicable, this column contains a letter code, in alphabetical order, which is keyed to the remarks contained in Section IV. B.5. EXPLANATION OF COLUMNS IN TOOLS AND TEST EQUIPMENT REQUIREMENTS, SECTION III. a. Column 1, Tools and Test Equipment Reference Code. The tool and test equipment reference code correlates with a code used in the MAC, Section II, Column 5. b. Column 2, Maintenance Level. The lowest level of maintenance authorized to use the tool or test equip- ment. c. Column 3, Nomenclature. Name or identification of the tool or test equipment. d. Column 4, National Stock Number. The National Stock Number of the tool or test equipment. e. Column 5, Tool Number. The manufacturer’s part number.