TM 5-2090-200-12&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I.
INTRODUCTION
B-1. General
a. This section provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels.
b. Section II designates overall responsibility for the performance of maintenance functions on the identified end item
or component and the work measurement time required to perform the functions by the designated maintenance level.
The implementation of the maintenance functions upon the end item or component will be consistent with the assigned
maintenance functions.
c. Section III lists the tools and test equipment required for each maintenance function as referenced from Section II.
B-2. Explanation of Columns in Section II
a. Column (1 ). Group Number. Column 1 lists group numbers to identify related components, assemblies,
subassemblies, and modules with their next higher assembly. The applicable groups are listed in the MAC in disassembly
sequence beginning with the first group removed.
b. Column (2 ). Component/Assembly. This column contains the noun names of components, assemblies,
subassemblies and modules for which maintenance is authorized.
c. Column (3 ). Maintenance Functions. This column lists the functions to be performed on the item listed in Column
2.
The maintenance functions are defined as follows:
(1) Inspect. To determine serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination.
(2) Test. To verify serviceability and detect incipient failure by measuring the mechanical or electrical characteristics
of an item and comparing those_ characteristics with prescribed standards.
(3) Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air
supplies.
(4) Adjust. To maintain within prescribed limits, by bringing into proper or exact position, or by setting the operating
characteristics to specified parameters.
(5) Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
(6) Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring
and diagnostic equipments used in precision measurement. Consists of comparison of two instruments, one of which is a
certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being
compared.
(7) Install. The act of emplacing, seating, or fixing into position an item, part or module (component or assembly) in a
manner to allow the proper functioning of an equipment or system.
(8) Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly)
for an unserviceable counterpart.
(9) Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, or replace) or other
maintenance actions (welding, grinding, riveting, straightening, facing, remachining or resurfacing) to restore
serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly module
(component or assembly), end item, or system .
(10) Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate technical
publications. Overhaul is normally the highest degree of maintenance per- formed by the Army. Overhaul does not
normally return an item to like new condition.
(11) Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like
new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those
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