TM 5-3990-264-13&P
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 as:
Field includes two sub columns, Crew (C) and Maintainer (F).
Sustainment includes two sub columns, Below Depot (H) and Depot (D).
The maintenance to be performed at field and sustainment levels is described as follows:
Crew maintenance. The responsibility of a using organization to perform maintenance on its assigned
equipment. It normally consists of inspecting, servicing, lubricating, adjusting, and replacing parts, minor
assemblies, and subassemblies. The replace function for this level of maintenance is indicated by the letter
"C" in the third position of the SMR code. A "C" appearing in the fourth position of the SMR code indicates
complete repair is possible at the crew maintenance level.
Maintainer maintenance. Maintenance accomplished on a component, accessory, assembly,
subassembly, plug-in unit, or other portion, either on the system or after it is removed. The replace function
for this level of maintenance is indicated by the letter "F", appearing in the third position of the SMR code.
An "F" appearing in the fourth position of the SMR code indicates complete repair is possible at the field
maintenance level. Items are returned to the user after maintenance is performed at this level.
Below depot sustainment. Maintenance accomplished on a component, accessory, assembly,
subassembly, plug-in unit, or other portion either on the system or after it is removed. The replace function
for this level of maintenance is indicated by the letter "H" appearing in the third position of the SMR code.
An "H" appearing in the fourth position of the SMR code indicates complete repair is possible at the below
depot sustainment maintenance level. Items are returned to the supply system after maintenance is
performed at this level.
Depot sustainment. Maintenance accomplished on a component, accessory, assembly, subassembly,
plug-in unit, or other portion, either on the system or after it, is removed. The replace function for this level
of maintenance is indicated by the letter "D" or "K" appearing in the third position of the SMR code. Depot
sustainment maintenance can be performed by either depot personnel or contractor personnel. A "D" or "K",
appearing in the fourth position of the SMR code indicates complete repair is possible at the depot
sustainment maintenance level. Items are returned to the supply systems after maintenance is performed
at this level.
The tools and test equipment requirements table (immediately following the MAC) lists the tools and test equipment
(both special tools and common tool sets) required for each maintenance function as referenced from the MAC.
The remarks table (immediately following the tools and test equipment requirements) contains 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 gaugings and evaluation of cannon tubes.
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