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TM 10-3930-242-12
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
e. Aline. To adjust specified variable elements
D-1. General
of an item to bring about optimum or desired
a. This section provides a general explanation of
performance.
all maintenance and repair functions authorized at
various maintenance categories.
f. Calibrate. To determine and cause corrections
to be made or to be adjusted on instruments or
b. The Maintenance Allocation Chart (MAC) in
test, measuring, and diagnostic equipments used in
section II designates overall authority and responsi-
precision measurement. Consists of comparisons
bility for the performance of maintenance func-
of two instruments, one of which is a certified
tions on the identified end item or component.
standard of known accuracy, to detect and adjust
The application of the maintenance functions to
any discrepancy in the accuracy of the instrument
the end item or component will be consistent with
being compared.
the capacities and capabilities of the designated
maintenance categories.
g. Remove/Install. To remove and install the
same item when required to perform service or
c. Section III lists the tools and test equipment
other maintenance functions. Install may be the
(both special tools and common tool sets) required
act of emplacing, seating, or fixing into position a
for each maintenance function as referenced from
space, repair part, or module (component or as-
section II.
sembly) in a manner to allow the proper function-
d. Section IV contains supplemental instructions
ing of an equipment or system.
and explanatory notes for a particular maintenance
function.
h. Replace.  To remove an unserviceable item
D-2. Maintenance Functions. Maintenance func-
and install a serviceable counterpart in its place.
tions will be limited to and defined as follows:
"Replace" is authorized by the MAC and is shown
as the third position of the SMR code.
a. Inspect. To determine the serviceability of an
item by comparing its physical, mechanical, and/or
i. Repair.
The application of maintenance
electrical characteristics with established standards
service1, including fault location/troubleshooting2,
through examination (e.g., by sight, sound, or feel).
removal/installation, disassemble/assembly3 proce-
dures, and maintenance actions  4 to identify
b. Test. To verify serviceability by measuring
troubles and restore serviceability to an item by
the mechanical, pneumatic, hydraulic, or electrical
characteristics of an item and comparing those
correcting specific damage, fault, malfunction, or
characteristics with prescribed standards.
failure in a part, subassembly, module (component
or assembly), end item, or system.
c. Service. Operations required periodically to
keep an item in proper operating condition, i.e., to
j. 0verhaul. That maintenance effort (service/
clean (including decontaminate, when required), to
action) prescribed to restore an item to a completely
preserve, to drain, to paint, or to replenish fuel,
serviceable/operational condition as required by
lubricants, chemical fluids, or gases.
maintenance standards in appropriate technical
publication (i.e., DMWR), Overhaul is normally
d. Adjust. To maintain or regulate, within pre+
the highest degree of maintenance performed by
scribed limits, by bringing into proper or exact
the Army. Overhaul does not normally return an
position, or by setting the operating characteristics
item to like-new condition.
to specified parameters.
1
Service-inspect, test, service, adjust, aline, calibrate, and/or replace.
2
Fault locating/troubleshooting ­ The process of investigating and detecting the cause of equipment
malfunctioning; the act of isolating a fault within a system or unit under test (UUT).
3
Diaassembly/assembly ­ encompasses the step-by-step taking apart (or breakdown) of a spare/func-
tional group coded item to the level of its least componency identified as maintenance significant (i.e.,
assigned an SMR code) for the category of maintenance under consideration.
Action ­welding, grinding, reiveting, straightening, facing, remachining, and/or resurfacing.

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