TM 5-4310-354-14
APPENDIX C
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
f. Calibrate. To determine and cause corrections
C-1. General.
to be made or to be adjusted on instruments or test
a. This section provides a general explanation of
measuring and diagnostic equipments used in precision
all maintenance and repair functions authorized at
measurement.
Consists of comparisons of two
various maintenance levels.
instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy in
b. The Maintenance Allocation Chart (MAC) in
the accuracy of the instrument being compared.
performance of maintenance functions on the identified
g. Install. The act of emplacing, seating, or fixing
end item or component. The implementation of the
into position an item, part, or module (component or
maintenance functions upon the end item or component
assembly) in a manner to allow the proper functioning of
will be consistent with the assigned maintenance
an equipment or system.
functions.
h. Replace. The act of substituting a serviceable
like type part, subassembly, or module (component or
equipment required for each maintenance function as
assembly) for an unserviceable counterpart.
referenced from Section II.
i. Repair.
The application of maintenance
services (inspect, test, service, adjust, align, calibrate, or
explanatory notes for a particular maintenance function.
replace) or other maintenance actions (welding, grinding,
riveting,
straightening,
facing,
remachining,
or
resurfacing) to restore serviceability to an item by
C-2. Maintenance Functions.
correcting specific damage, fault, malfunction, or failure
a. Inspect. To determine the serviceability of an
in a part, subassembly, module (component or
item by comparing its physical, mechanical and/or
assembly), and item, or system.
electrical characteristics with established standards
through examination.
j. Overhaul. That maintenance effort (services/
actions) necessary to restore an item to a completely
b. Test. To verify serviceability and detect incipient
serviceable/operational condition as prescribed by
failure by measuring the mechanical or electrical
maintenance standards (i.e., DMWR) in appropriate
characteristics of an item and comparing those
technical publications. Overhaul is normally the highest
characteristics with prescribed standards.
degree of maintenance performed by the Army.
Overhaul does not normally return an item to like new
c. Service.
Operations required periodically to
condition.
keep an item in proper operating condition, i.e., to clean
(decontaminate), to preserve, to drain, to paint, or to
k. Rebuild.
Consists of those services/actions
replenish fuel, lubricants, hydraulic fluids, or compressed
necessary for the restoration of unserviceable equipment
air supplies.
to a like new condition in accordance with original
manufacturing standards. Rebuild is the highest degree
d. Adjust. To maintain, within prescribed limits, by
of materiel maintenance applied to Army equipment.
bringing into proper or exact position, or by setting the
The rebuild operation includes the act of returning to
operating characteristics to specified parameters.
zero those age measurements (hours/miles, etc.)
considered in classifying Army equipments/components.
e. Align. To adjust specified variable elements of
an item to bring about optimum or desired performance.
C-1
