Quantcast APPENDIX B. MAINTENANCE ALLOCATION CHART (MAC) - TM-55-1905-223-24-120091

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TM 55-1905-223-24-12
a This introduction (Section I) provides a general explanation of all maintenance and re-
pair functions authorized at various maintenance levels under the standard Army Maintenance
System concept.
b The Maintenance Allocation Chart (MAC) in Section II designates overall authority and
responsibility for the performance of maintenance functions on the identified end item or compo-
nent. The application of the maintenance functions to the end item or component will be consistent
with the capacities and capabilities of the designated maintenance levels, which are shown in the
MAC in column (4) as:
Unit - includes two subcolumns: C (operator/crew) and O (unit) maintenance.
Direct Support - includes an F subcolumn.
General Support - includes an H subcolumn.
Depot - includes a D subcolumn.
c Section lll lists the tools and test equipment (both special tools and common tools 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 as referenced from Section II.
B-2 MAINTENANCE FUNCTIONS. Maintenance functions will be limited to and defined as fol-
a Inspect. To determine the serviceability of an hem item comparing its physical, mechani-
cal, and/or electrical characteristics with established standards through examination (i.e., 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 stan-
c Service. Operations required periodically to keep an item in operating condi-
tion, i.e., to clean (includes decontamination, when required), to replace filters, 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 or ex-
act 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 de-
sired performance.
f Calibrate. To determine and cause corrections to be made or to be adjusted on instru-
ments or test, measuring, and diagnostic equipment used in precision measurement. Consists
of comparisons of two instruments, one of which is a certified standard of known accuracy, to de-
tect and adjust any discrepancy in the accuracy of the instrument being compared.
g, Remove/install. To remove and install the same item when required to perform service
or other maintenance functions. Install may be the act of emplacing, seating, or fixing into position
a spare, repair part, or module (component or assembly) in a manner to allow the proper function-
ing of an equipment or system.
h Replace. To remove an unserviceable item and install a serviceable counterpart in its
place. Replace is authorized by the MAC and is shown as the 3rd position code of the SMR code.
Change 3 B-1


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