TM 1-6625-724-13&P0059 000059 00-1MAINTENANCE ALLOCATION CHARTINTRODUCTIONThe Army Maintenance System MACThis introduction provides a general explanation of all maintenance and repair functions authorized at variousmaintenance levels under the standard Army Maintenance System concept.The Maintenance Allocation Chart (MAC) designates overall authority and responsibility for the performance ofmaintenance functions on the identified end item or component. The application of the maintenance functions—Aviation Unit Maintenance (AVUM), Aviation Intermediate Maintenance (AVIM), and Depot Maintenance—to the enditem or component will be consistent with the capacities and capabilities of the designated maintenance levels, whichare shown on the MAC in column (4) as:AVUM – corresponds to an “O” code in the Repair Parts and Special Tools List (RPSTL).AVIM – corresponds to “F” code in the RPSTL.DEPOT – corresponds to a “D” code in the RPSTL.The maintenance to be performed at the depot and in the field is described as follows:Aviation Unit Maintenance (AVUM)- AVUM activities will be staffed and equipped to perform high frequency “On-Aircraft” maintenance tasks required to retain or return equipment to a serviceable condition. The maintenancecapability of the AVUM will be governed by the MAC and limited by the amount and complexity of Ground SupportEquipment (GSE) facilities required, authorized manning strength, and critical skills available. The range and quantityof authorized spare modules/components will be consistent with the mobility requirements dictated by the air mobilityconcept. (Assignments of maintenance tasks to divisional company-sized aviation units will consider the overallmaintenance capability of the division, the requirement to conserve personnel and equipment resources, and airmobility requirements.)1.Company-Sized Aviation Units. Perform those tasks that consist primarily of preventative maintenanceand maintenance repair and replacement functions associated with sustaining a high level of aircraftoperational readiness. Perform maintenance inspections and servicing to include preflight, daily,intermediate, periodic (or phased) and special inspections as authorized by the MAC or higherheadquarters. Identify the cause of equipment/system malfunctions using applicable technical manualtroubleshooting instructions, Built-In Test Equipment (BITE), installed aircraft instruments, or Test,Measurement and Diagnostic Equipment (TMDE). Replace worn or damaged modules/components thatdo not require complex adjustments or system alignment and which can be removed/installed withavailable skills, tools, and ground support equipment. Perform operational and continuity checks andmakes minor repairs to the electrical system. Inspect, service, and make operational, capacity, andpressure checks to hydraulic systems. Perform servicing, functional adjustments, and minorrepair/replacement to the flight control, propulsion, power train, and fuel systems. Accomplish airframerepair that does not require extensive disassembly, jigging, or alignment. The manufacture of airframeparts will be limited to those items that can be fabricated with tools and equipment found in currentairmobile tool and shop sets. Evacuate unserviceable modules/components and end items beyond therepair capability of AVUM to the support AVIM.2.Less than Company-Sized Aviation Units. Aviation elements organic to brigade, group, battalionheadquarters, and detachment-sized units are normally small and have less than ten aircraft assigned.Maintenance tasks performed by these units will be those which can be accomplished by the aircraft crewchief or assigned aircraft repairman and will normally be limited to preventative maintenance, inspections,servicing, spot painting, module/component fault diagnosis, and replacement of selectedmodules/components. Repair functions will normally be accomplished by the support AVIM unit.Aviation Intermediate Maintenance (AVIM)– United States Army TMDE Support Group (USATSG) provides AVIMsupport. Authorized maintenance includes replacement and repair of modules/components and end items that canbe accomplished efficiently with available skills, tools, and equipment. USATSG inspects, troubleshoots, tests,diagnoses, repairs, adjusts, calibrates, and aligns system modules and components.1.Provides mobile, responsive “one-stop” maintenance support. (Maintenance functions that are notconducive to sustaining air mobility will be assigned to depot maintenance.)
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