TB 9-2320-279-13&P-4
FIELD 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 the two
maintenance levels under the Two-Level Maintenance System concept.
This 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 includes three subcolumns, Crew maintenance (C), Service maintenance (O), and Field maintenance
(F).
Sustainment includes two subcolumns, Below Depot (H) and Depot (D).
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
Maintenance functions are limited to and defined as follows:
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.
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.
SERVICE Operations required periodically to keep an item in proper operating condition; e.g., 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:
UNPACK To remove from packing box for service or when required for the performance of maintenance
operations.
REPACK To return item to packing box after service and other maintenance operations.
CLEAN To rid the item of contamination.
TOUCH UP To spot paint scratched or blistered surfaces.
MARK To restore obliterated identification.
ADJUST To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the operating
characteristics to specified parameters.
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