MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
e. Aline. To adjust specified variable elements of
a. This section provides a general explanation of all
an item to bring about optimum or desired performance.
maintenance and repair functions authorized at various
f. Calibrate. To determine and cause corrections
to be made or to be adjusted on instruments or test,
b. The Maintenance Allocation Chart (MAC) in
measuring, and diagnostic equipments used in precision
section II designates overall authority and responsibility
Consists of comparisons of two
for the performance of maintenance functions on the
instruments, one of which is a certified standard of
identified end item or component. The application of the
known accuracy, to detect and adjust any discrepancy in
maintenance functions to the end item or component will
the accuracy of the instrument being compared.
be consistent with the capacities and capabilities of the
g. Remove/Install. To remove and install the same
designated maintenance categories.
item when required to perform service or other
Install may be the act of
(both special tools and common tool sets) required for
emplacing, seating, or fixing into position a space, repair
each maintenance function as referenced from section II.
part, or module (component or assembly) in a manner to
allow the proper functioning of an equipment or system.
and explanatory notes for a particular maintenance
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 third position
of the SMR code.
functions will be limited to and defined as follows:
application of maintenance
a. Inspect. To determine the serviceability of an
service , including
item by comparing its physical, mechanical, and/or
removal/installation, disassembly/assembly procedures,
electrical characteristics with established standards
and maintenance actions to identify troubles and restore
through examination (e.g., by sight, sound, or feel).
serviceability to an item by correcting specific damage,
fault, malfunction, or failure in a part, subassembly,
b. Test. To verify serviceability by measuring the
module (component or assembly), end item, or system.
mechanical, pneumatic, hydraulic, or electrical
characteristics of an item and comparing those
j. Overhaul. That maintenance effort (service/
characteristics with prescribed standards.
action) prescribed to restore an item to a completely
serviceable/operational condition as required by
Operations required periodically to
maintenance standards in appropriate technical
keep an item in proper operating condition, i.e., to clean
publication (i.e., DMWR).
Overhaul is normally the
(including decontaminate, when required), to preserve, to
highest degree of maintenance performed by the Army.
drain, to paint, or to replenish fuel, lubricants, chemical
Overhaul does not normally return an item to like-new
fluids, or gases.
To maintain or regulate, within
prescribed limits, by bringing into proper or exact
position, or by setting the operating characteristics to
Service inspect, test, service, adjust, aline, calibrate, and/or replace.
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).
Disassembly/assembly encompasses the step-by-step taking apart (or breakdown) of a spare/functional 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, riveting, straightening, facing, remachining, and/or resurfacing.
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