MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. THE ARMY MAINTENANCE SYSTEM (MAC)
a. This introduction provides a general explanation of all maintenance and repair functions authorized at
the two maintenance levels under the Two-Level Maintenance System Concept.
b. This MAC designates overall authority and responsibility for the performance of maintenance
functions on the identified end item or component. The application of the maintenance functions to the end
item or component levels, which are shown on the MAC in column (4) as:
Field includes two columns, Unit maintenance and Direct Support maintenance. The Unit
maintenance column is divided again into two more subcolumns, C for Operator or Crew
and O for Unit maintenance.
Sustainment includes two subcolumns, general support (H) and depot (D).
c. The tools and test equipment requirements list the tools and test equipment (both special tools and
common tool sets) required for each maintenance function as referenced from the MAC.
d. The remarks contain supplemental instructions and explanatory notes for a particular maintenance
B-2. MAINTENANCE FUNCTIONS
Maintenance functions are limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or
electrical characteristics with established standards through examination (e.g., by sight, sound, or feel).
This includes scheduled inspection and gagings and evaluation of cannon tubes.
b. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical
characteristics of an item and comparing those characteristics with prescribed standards on a scheduled
basis, i.e., load testing of lift devices and hydrostatic testing of pressure hoses.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases. This includes scheduled exercising and purging of recoil mechanisms. The
following are examples of service functions:
1. Unpack. To remove from packing box for service or when required for the performance
of maintenance operations.
2. Repack. To return item to packing box after service and other maintenance operations.
4. Touch up. To spot paint scratched or blistered surfaces.
5. Mark. To restore obliterated identification.
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or
by setting the operating characteristics to specified parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired