TM 5-5420-280-23&P
SUPPORTING INFORMATION
RAPIDLY EMPLACED BRIDGE (REB)
NSN 5420-01-481-3959 P/N 12480471
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM (AMS)
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.
The Maintenance Allocation Chart (MAC) (WP 0130 00) 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 two subcolumns, Crew (C) and Maintainer (F).
Sustainment includes two subcolumns, Below Depot (H) and Depot (D).
The maintenance to be performed at field and sustainment levels is described as follows:
1. 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.
2. 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.
3. 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.
4. 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 (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.
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