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Appendix A. REFERENCES - continued - TM-10-3930-673-20-10974
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TM-10-3930-673-20-1 All Terrain Lifter Army System (ATLAS) 10 000 lb Capacity Manual
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MAINTENANCE FUNCTIONS - TM-10-3930-673-20-10976
TM 10-3930-673-20-1
B
MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
B-1. THE ARMY MAINTENANCE SYSTEM MAC
a. 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.
b. The MAC immediately following this 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 in the MAC in column (4) as:
Field - includes subcolumns:
C - Operator/Crew
O - Unit
D - Direct Support
Sustainment - includes subcolumns:
H - General Support
D - Depot
c. Section III lists the tools and test equipment (both special tools and common tool sets) required for each maintenance
function as referenced from Section II.
d. Section IV contains supplemental instructions and explanatory notes for a particular maintenance function.
B-2. MAINTENANCE FUNCTIONS
Maintenance functions are limited to and defined as follows:
a. 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).
b. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of an
item and comparing those characteristics with prescribed standards.
c. 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.
d. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the operating
characteristics to specified parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.

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