TM 9-1345-203-12
MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
C.2.3 Service. Operations required periodically to keep
C.1
THE ARMY MAINTENANCE SYSTEM MAC.
an item in proper operating condition; e.g., to clean (includes
C.1.1 This introduction provides a general explanation of
decontaminate, when required), to preserve, to drain, to
all maintenance and repair functions authorized at the two
paint, or to replenish fuel, lubricants, chemical fluids, or
maintenance levels under the Two-Level Maintenance Sys-
gases. This includes scheduled exercising and purging of
tem concept.
recoil mechanisms.
C.2.4 Adjust. To maintain or regulate, within prescribed
C.1.2 The MAC designates overall authority and respon-
limits, by bringing into proper position, or by setting the
sibility for the performance of maintenance functions on the
operating characteristics to specified parameters.
identified end item or component. The application of the
maintenance functions to the end item or component shall be
C.2.5 Align. To adjust specified variable elements of an
consistent with the capacities and capabilities of the desig-
item to bring about optimum or desired performance.
nated maintenance levels, which are shown on the MAC in
column (4) as:
C.2.6 Calibrate. To determine and cause corrections to
be made or to be adjusted on instruments of test, measuring,
Field - Includes three subcolumns, Crew (C),
and diagnostic equipment used in precision measurement.
Service (O) and Field (F) maintenance.
Consists of comparisons of two instruments, one of which is
Sustainment - Includes two subcolumns, Below
a certified standard of known accuracy, to detect and adjust
Depot (H) and Depot (D) maintenance.
any discrepancy in the accuracy of the instrument being
compared.
C.1.3 The tools and test equipment requirements (imme-
diately following the MAC) list the tools and test equipment
C.2.7 Remove/Install. To remove and install the same
(both special tools and common tool sets) required for each
item when required to perform service or other maintenance
maintenance function as referenced from the MAC.
functions. Install may be the act of emplacing, seating, or
fixing into position a spare, repair part, or module (compo-
C.1.4 The remarks (immediately following the tools and
nent or assembly) in a manner to allow the proper function-
test equipment requirements) contain supplemental instruc-
ing of an equipment or system.
tions and explanatory notes for a particular maintenance
function.
C.2.8 Replace. To remove an unserviceable item and
install a serviceable counterpart in its place. "Replace" is
MAINTENANCE FUNCTIONS.
C.2
authorized by the MAC and assigned maintenance level is
Maintenance functions are limited to and defined as follows:
shown as the third position code of the Source, Maintenance
and Recoverability (SMR) code.
C.2.1 Inspect. To determine the serviceability of an item
C.2.9 Repair. The application of maintenance services,
by comparing its physical, mechanical, and/or electrical
including fault location/troubleshooting, removal/installa-
characteristics with established standards through examina-
tion, disassembly/assembly procedures, and maintenance
tion (e.g., by sight, sound, or feel). This includes scheduled
actions to identify troubles and restore serviceability to an
inspection and gagings and evaluation of cannon tubes.
item by correcting specific damage, fault, malfunction, or
C.2.2 Test. To verify serviceability by measuring the
failure in a part, subassembly, module (component or assem-
mechanical, pneumatic, hydraulic, or electrical characteris-
bly), end item, or system.
tics 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.
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