MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
(6) Calibrate. To determine and cause corrections
to be made or to be adjusted on instruments or test measur-
a. This section provides a general explanation of
ing and diagnostic equipments used in precision measure-
all maintenance and repair functions authorized at vari-
ment. Consists of comparison of two instruments, one of
ous maintenance levels.
which is a certified standard of known accuracy, to detect
b. Section II, designates overall responsibility for
and adjust any discrepancy in the accuracy of the instrument
the performance of maintenance functions on the identi-
fied end item or component and the work measurement
(7) Install. The act of emplacing, seating, or fixing
time required to perform the functions by the designated
into position an item, part or module (component or assem-
maintenance level. The implementation of the mainte-
bly) in a manner to allow the proper functioning of an equip-
nance functions upon the end item or component will be
ment or system.
consistent with the assigned maintenance functions.
(8) Replace. The act of substituting a serviceable
like type part, sub-assembly, or module (component or as-
required for each maintenance function as referenced
sembly) for an unserviceable counterpart.
(9) Repair. The application of maintenance serv-
ices (inspect, test, service, adjust, align, calibrate, or re-
place) or other maintenance actions (welding, grinding, riv-
a. Column (1), Group Number. Column 1 lists
eting, straightening, facing, remachining or resurfacing) to
group numbers to identify related components, assem-
restore serviceability to an item by correcting specific dam-
blies, subassemblies, and modules with their next higher
age, fault, malfunction, or failure in a part, sub-assembly,
assembly. The applicable groups are listed in the MAC in
module (component or assembly), end item, or system.
disassembly sequence beginning with the first group re-
(10) Overhaul. That maintenance effort (service/action)
necessary to restore an item to a completely service-
b. Column (2), Component/Assembly. This column
able/operational condition as prescribed by maintenance
contains the noun names of components, assemblies,
standards (i.e., DMWR) in appropriate technical publications.
subassemblies and modules for which maintenance is
Overhaul is normally the highest degree of maintenance
performed by the Army. Overhaul does not normally return
c. Column (3), Maintenance Functions. This col-
an item to a like new condition.
umn lists the functions to be performed on the item listed
(11) Rebuild. Consists of those services/actions neces-
in Column 2. The maintenance functions are defined as
sary for the restoration of unserviceable equipment to a like
new condition in accordance with original manufacturing
(1) Inspect. To determine serviceability of an
standards. Rebuild is the highest degree of materiel mainte-
item by comparing its physical, mechanical, and/or elec-
nance applied to Army equipment. The rebuild operation
trical characteristics with established standards through
includes the act of returning to zero those age measure-
ments (hours/miles, etc.) considered in classifying Army
(2) Test. To verify serviceability and detect
incipient failure by measuring the mechanical or electrical
d. Column (4), Maintenance Category. This column is
characteristics of an item and comparing those charac-
made up of sub-columns for each category of maintenance.
teristics with prescribed standards.
Work time figures are listed in these sub-columns for the
(3) Service. Operations required periodically
lowest level of maintenance authorized to perform the func-
to keep an item in proper operating condition, i.e., to
tion listed in Column 3. These figures indicate the average
clean (decontaminated), to preserve, to drain, to paint, or
active time required to perform the maintenance function at
to replenish fuel, lubricants, hydraulic fluids, or com-
the indicated category of maintenance under typical field
pressed air supplies.
(4) Adjust. To maintain within prescribed lim-
e. Column (5), Tools and Equipment. This column is
its, by bringing into proper or exact position, or by setting
provided for referencing by code, the common tool sets (not
the operating characteristics to specified parameters.
individual tools) special tools, test and support equipment
(5) Align. To adjust specified variable ele-
required to perform the designated function.
ments of an item to bring about optimum or desired per-