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 TM 5-1940-277-20
TM 1940-20/2
Section I
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION
THE ARMY MAINTENANCE SYSTEM (AMS)
This Section provides a general explanation of all maintenance and repair functions authorized at two
maintenance levels under Two-Level Maintenance System concept.
The Maintenance Allocation Chart (MAC) Section II designates overall authority and responsibility for the
performance of maintenance functions on the identified end item or component. The application of
maintenance 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 Level (Tactical)C (operator/crew), O (unit) maintenance, and F (Direct Support). Field
Maintenance is on-system maintenance and is mainly replacement of defective parts and preventative
maintenance. Field maintenance returns repaired equipment to operation.
It covers crew, unit, and selected DS maintenance tasks. Some "off-system" maintenance can be done
at field level, if based on task analysis, it is simple to complete or it is critical to mission readiness.
Sustainment Level (Sustainment)H (General Support) and D (Depot). Sustainment is off-system
maintenance and is mainly repair of defective or worn out equipment/parts. Sustainment maintenance
returns repaired equipment/parts to the supply system. It covers selected DS tasks, GS and Depot
maintenance.
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 remark (immediately following the tools and test equipment requirements) contains supplemental
instructions and explanatory notes for a particular maintenance function.
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