MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
(a) This section provides a general explanation of all maintenance and repair functions authorized at various
(b) The Maintenance Allocation Chart (MAC) in Section II 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 will be consistent with the capacities and capabilities of the
designated maintenance levels.
(c) Section III lists the tools and test equipment (both special tools and common tool sets) required for each
maintenance function as referenced from Section II.
(d) Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.
Maintenance functions will be 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).
(b) Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
(c) Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and is shown as the third position code of the SMR code.
(d) Repair The application of maintenance services, including fault location/troubleshooting, removal/ installation, and
disassembly/assembly procedures, and maintenance actions to identify troubles and 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.
(e) Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of replacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
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