MAINTENANCE ALLOCATION CHART
Section I. Introduction
e. Align. To adjust specified variable elements of an
item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be
a. This section provides a general explanation of all
made or to be adjusted on instruments or test measuring
maintenance and repair functions authorized at various
and diagnostic equipments used in precision
measurement. Consists of comparisons of two
b. The Maintenance Allocation Chart (MAC) in section
instruments, one of which is a certified standard of
II designates overall responsibility for the performance of
known accuracy, to detect and adjust any discrepancy in
maintenance functions on the identified end item or
the accuracy of the instrument being compared.
component. The implementation of the maintenance
g. Install. The act of emplacing, seating, or fixing into
functions upon the end item or component will be
position an item, part, or module (component or
consistent with the assigned maintenance functions.
assembly) in a manner to allow the proper functioning of
c. Section III lists the special tools and test equipment
an equipment or system.
required for each maintenance function as referenced
h. Replace. The act of substituting a serviceable like
from section II.
type part, sub-assembly, or module (component or
d. Section IV contains supplemental instructions on
assembly) for an unserviceable counterpart.
explanatory notes for a particular maintenance function.
i. Repair. The application of maintenance services or
other maintenance actions to restore serviceability to an
D-2. Maintenance Functions
item by correcting specific damage, fault, malfunction, or
failure in a part, subassembly, module (component or
a. Inspect. To determine the serviceability of an item
assembly), and item, or system.
by comparing its physical, mechanical and/or electrical
characteristics with established standards through
(services/actions) necessary to restore an item to a
completely serviceable/ operational condition as
b. Test. To verify serviceability and detect incipient
prescribed by maintenance standards (i.e., DMWR) in
failure by measuring the mechanical or electrical
appropriate technical publications. Overhaul is normally
characteristics of an item and comparing those
the highest degree of maintenance performed by the
characteristics with prescribed standards.
Army. Overhaul does not normally return an item to like
c. Service. Operations required periodically to keep
an item in proper operating condition, i.e., to clean
k. Rebuild. Consists of those services/actions
(decontaminate), to preserve, to drain, to paint, or to
necessary for the restoration of unserviceable equipment
replenish fuel, lubricants, hydraulic fluids, or compressed
to a like new condition in accordance with original
manufacturing standards. Re-build is the highest degree
d. Adjust. To maintain, within pre-scribed limits, by
of materiel maintenance applied to Army equipment.
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
Services-inspect, test, service, adjust, align, calibrate, or replace.
Action-welding, grinding, riveting, straightening, facing, remachining, or resurfacing.