TM 9-3950-253-13&P
FIELD MAINTENANCE
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
INTRODUCTION
The Army Maintenance System MAC
This introduction provides a general explanation of the maintenance and repair functions.
The MAC (immediately following this introduction) designates overall authority and responsibility for the
performance of maintenance tasks on the identified end item or component. The application of the maintenance
tasks to the end item or component shall be consistent with the capacities and capabilities of the designated
maintenance levels/classes, which are shown in the MAC in column (4). Column (4) is divided into two secondary
columns. These columns indicate the maintenance levels/classes of `Field and `Sustainment . Each maintenance
level column is further divided into two sub-columns. These sub-columns identify the maintenance classes and
are as follows:
1.
Field level maintenance classes:
a.
Crew (operator) maintenance. This is 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. Items with a "C" ("O" for
joint service reporting) in the third position of the Source, Maintenance, and Recoverability (SMR)
code may be replaced at the crew (operator) class. A code of "C" ("O" for joint service) in the
fourth position of the SMR code indicates complete repair is authorized at the crew (operator)
class.
b.
Maintainer maintenance. This is maintenance accomplished on a component, accessory,
assembly, subassembly, plug-in unit, or other portion by field level units. This maintenance is
performed either on the system or after it is removed. An "F" in the third position of the SMR code
indicates replacement of assemblies, subassemblies, or other components is authorized at this
level. An "F" in the fourth position of the SMR code indicates complete repair of the identified item
is allowed at the Maintainer class. Items repaired at this level are normally returned to the user
after maintenance is performed.
2.
Sustainment level maintenance classes:
a.
Below depot sustainment. This is maintenance accomplished on a component, accessory,
assembly, subassembly, plug-in unit, or other portion either on the system or after it is removed.
The item subject to maintenance has normally been forwarded to a maintenance facility away
from the field level supporting units. An "H" in the third position of the SMR code indicates
replacement of assemblies, subassemblies, or other components is authorized at this class. An
"H" appearing in the fourth position of the SMR code indicates complete repair is possible at this
class. Items are normally returned to the supply system after maintenance is performed at this
class.
b.
Depot. This is maintenance accomplished on a component, accessory, assembly, subassembly,
plug-in unit, or other portion either on the system or after it is removed. Assets to be repaired at
this class are normally returned to an Army Depot or authorized contractor facility. The replace
function for this class of maintenance is indicated by the letter "D" or "K" appearing in the third
position of the SMR code. 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 system after maintenance is performed at this class.
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 task as referenced from the
MAC.
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