TM 10-3930-641-20
Section I. Maintenance Allocation Chart (MAC) Introduction
THE ARMY MAINTENANCE SYSTEM MAC
1.
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.
2.
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 desig-
nated maintenance levels, which are shown in the MAC (Appendix B) in column (4) as:
Field - includes subcolumns:
C - Operator/Crew
O - Organizational
F - Direct Support
Sustainmant - includes subcolumns:
H - General Support
D - Depot
3.
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.
4.
The remarks (immediately following the tools and test equipment requirements) contain supplemental instructions and explanatory notes for a particular maintenance
function.
MAINTENANCE FUNCTIONS
Maintenance functions are limited to and defined as follows:
1.
Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical characteristics with established standards through exami-
nation (e.g., by sight, sound, or feel).
2.
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics of an item and comparing those characteristics with pre-
scribed standards on a scheduled basis, i.e., load testing of lift devices and hydrostatic testing of pressure hoses.
3.
Service. Operations required periodically to keep an item in proper operating condition; e.g., to clean (includes decontaminate, when required), preserve, drain, paint,
or replenish fuel, lubricants, chemical fluids, or gases.
4.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting the operating characteristics to specified parameters.
5.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
6.
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, measuring, and diagnostic equipment used in precision measure-
ment. Calibration consists of comparisons of two instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the
accuracy of the instrument being compared.
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