FIELD AND SUSTAINMENT MAINTENANCE
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
The Army Maintenance System MAC
This introduction provides a general explanation of all maintenance and repair functions authorized at various
maintenance levels under the two-level Army Maintenance System concept.
The MAC (immediately following the introduction) 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 shall be consistent with the capacities and capabilities of the
designated maintenance levels, which are shown on the MAC in column (4) as:
Field Level includes three subcolumns, C (operator/crew), O (unit) maintenance, and F (direct support)
Sustainment Level includes two subcolumns, H (general support) and D (depot).
The tools and test equipment requirements (immediately following the MAC) list the tools and test equipment
(both special tools and common tool sets) required for each maintenance function as referenced from the MAC.
The remarks (immediately following the tools and test equipment requirements) contain supplemental instructions
and explanatory notes for a particular maintenance function.
Maintenance functions are limited to and defined as follows:
1. 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.
2. 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.
3. Service. Operations required periodically to keep an item in proper operating condition; e.g., to mark (restore
obliterated identification), to clean (includes decontaminate, when required), to preserve, to drain, to touchup
paint, or to replenish fuel, lubricants, chemical fluids, or gases. This includes scheduled exercising and
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper 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.