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APPENDIX B MAINTENANCE ALLOCATION CHART |
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 TM 3-4240-284-20&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
d. Adjust. To maintain, within prescribed
B-1. GENERAL.
limits, by bringing into proper or exact posi-
a. This section provides a general explanation
tion, or by setting the operating charac-
of all maintenance and repair functions au-
teristics to specified parameters.
thorized at various maintenance categories.
e. Aline. To adjust specified variable ele-
b. The Maintenance Allocation Chart (MAC) in
ments of an item to bring about optimum or
section II designates overall responsibility
desired performance.
for the performance of maintenance func-
f. Calibrate. To determine and cause correc-
tions on the identified end item or Compo-
tions to be made or to be adjusted on in-
nent. The implementation of the mainte-
struments or test, measuring, and diagnos-
nance functions upon the end item or com-
tic equipments used in precision measure-
ponent will be consistent with the assigned
.
ment. Consists of comparisons of two in-
maintenance functions.
struments, one of which is a certified stan-
c.
Section III lists the special tools and test
dard of known accuracy, to detect and ad-
equipment required for each maintenance
just any discrepancy in the accuracy of the
function as referenced from section II.
instrument being compared.
Section IV contains supplemental instruc-
d.
g. Install The act of emplacing, seating, or
tions and explanatory notes for a particular
fixing into position an item, part, or module
maintenance function.
(component or assembly) in a manner to
allow the proper functioning of an equip
B-2. MAINTENANCE FUNCTIONS. Maintenance
ment or system.
functions will be limited to and defined as
h. Replace. The act of substituting a service-
follows:
able like type part, subassembly, or module
a. Inspect. To determine the serviceability of
(component or assembly) for an unservice-
an item by comparing its physical, mechani-
able counterpart.
cal, and/or electrical characteristics with es-
i. Repair. The application of maintenance
tablished standards through examination.
services l or other maintenance actions2 to
b. Test. To verify serviceability by measur-
restore serviceability to an item by cor-
ing the mechanical or electrical characteris-
recting specific damage, fault, malfunction,
tics of an item and comparing those charac-
or failure in a part, subassembly, module
teristics with prescribed standards.
(component or assembly), end item, or sys-
c. Service. Operations required periodically
tem.
to keep an item in proper operating condi-
Overhaul. That maintenance effort
tion, i.e., to clean (includes decontaminate,
j
(service/action) necessary to restore an item
when required), to preserve, to drain, to
to a completely serviceable/operational con-
paint, or to replenish fuel, lubricants,
dition as prescribed by maintenance stan-
chemical fluids, or gases.
dards in appropriate technical publications
(i.e., DMWR). Overhaul is normally the
highest degree of maintenance performed
by the Army. Overhaul does not normally
return an item to like new condition.
1
Services - inspect, test, service, adjust, aline, calibrate, or replace.
2
Actions - welding, grinding, riveting, straightening, facing, remachining, or resurfacing.
B-1
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