TM 5-4310-356-14
APPENDIX C
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
to be made or to be adjusted on instruments or test
C-1. General.
measuring and diagnostic equipments used in precision
measurement.
Consists of comparisons of two
a. This section provides a general explanation of
instruments, one of which is a certified standard of
all maintenance and repair functions authorized at
known accuracy, to detect and adjust any discrepancy in
various maintenance levels.
the accuracy of the instrument being compared.
b. The Maintenance Allocation Chart (MAC) in
g. Install. The act of emplacing, seating, or fixing
into position an item, part, or module (component or
performance of maintenance functions on the identified
assembly) in a manner to allow the proper functioning of
end item or component. The implementation of the
an equipment or system.
maintenance functions upon the end item or component
will be consistent with the assigned maintenance
h. Replace. The act of substituting a serviceable
functions.
like type part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
c. Section III lists the special tools and test
equipment required for each maintenance function as
i. Repair.
The application of maintenance
referenced from Section II.
services (inspect, test, service, adjust, align, calibrate,
or replace) or other maintenance actions (welding,
d. Section IV contains supplemental instructions
grinding, riveting, straightening, facing, remachining, or
on explanatory notes for a particular maintenance
resurfacing) to restore serviceability to an item by
function.
correcting specific damage, fault, malfunction, or failure
in a part, subassembly, module (component or
C-2. Maintenance Functions.
assembly), and item, or system.
j. Overhaul. That maintenance effort (services/
a. Inspect. To determine the serviceability of an
actions) necessary to restore an item to a completely
item by comparing its physical, mechanical and/or
serviceable/operational condition as prescribed by
electrical characteristics with established standards
maintenance standards (i.e., DMWR) in appropriate
through examination.
technical publications. Overhaul is normally the highest
b. Test.
To verify serviceability and detect
degree of maintenance performed by the Army.
incipient failure by measuring the mechanical or
Overhaul does not normally return an item to like new
electrical characteristics of an item and comparing those
condition.
characteristics with prescribed standards.
k. Rebuild. Consists of those services/actions
c. Service. Operations required periodically to
necessary for the restoration of unserviceable
keep an item in proper operating condition, i.e., to clean
equipment to a like new condition in accordance with
(decontaminate), to preserve, to drain, to paint, or to
original manufacturing standards. Rebuild is the highest
replenish fuel, lubricants, hydraulic fluids, or
degree of materiel maintenance applied to Army
compressed air supplies.
equipment. The rebuild operation includes the act of
returning to zero those age measurements (hours/miles,
d. Adjust. To maintain, within prescribed limits,
etc.) considered in classifying Army equipments/
by bringing into proper or exact position, or by setting
components.
the operating characteristics to specified parameters.
e. Align. To adjust specified variable elements of
C-3. Column Entries Used in the MAC.
an item to bring about optimum or desired performance.
a. Column 1, Group Number. Column 1 lists
f. Calibrate. To determine and cause corrections
C-1
