M A I N T E N A N C E ALLOCATION CHART
Section I. INTRODUCTION
failure. Repair may be accomplished at each level
The maintenance allocation chart (MAC) assigns
j. Overhaul. Normally the highest degree of
authorized maintenance functions to each main-
maintenance performed by the Army in order to
tenance level. These functions are assigned to the
minimize time. Work in process is consistent with
lowest available maintenance level based on past
experience in the following considerations:
quality and economy of operation. It consists of
that maintenance necessary to restore an item to
a. Skills Available.
completely serviceable condition as prescribed by
b. Time Required.
maintenance standards in technical publications for
c. Tools and Test Equipment Authorized.
each item of equipment. Overhaul normally does
If the maintenance function is a replacement
not return an item to like new, zero mileage, or zero
function only, the item is not listed in the MAC.
Such an item, if included in the Repair Parts and
Special Tools List for the end item, is automatic
k. Rebuild. The highest degree of materiel
authority to replace at the lowest maintenance level
maintenance. It consists of restoring equipment as
to which the part is authorized. Deviation from
nearly as possible to new condition in accordance
maintenance operations as allocated in the MAC is
with original manufacturing standards. Rebuild is
a u t h o r i z e d only upon approval of the Army
performed only when required by operational
considerations or other paramount factors and then
only at the depot maintenance category. Rebuild
reduces to zero the hours or miles the equipment, or
Maintenance functions will be limited to and
component thereof, has been in use.
defined as follows:
l. Symbols. The uppercase letter placed in the
a. Inspect. To determine serviceability of an item
appropriate column indicates the lowest level at
by comparing its physical. mechanical, and elec-
which that particular maintenance function is to be
trical characteristics with established standards.
b. Test. To verify serviceability and to detect
electrical or mechanical failure by use of test
O Organizational Maintenance
F Direct Support Maintenance
c. Service. To clean, to preserve, to charge, and to
H General Support Maintenance
B-3. Explanation of Columns
d. Adjust. To rectify to the extent necessary to
bring into proper operating range.
a. Column 1, Group Number. This column lists
e. Aline. To adjust specified variable elements of
group numbers, the purpose of which is to identify
an item to bring to optimum performance.
c o m p o n e n t s , assemblies, subassemblies, and
f. Calibrate. To determine the corrections to be
models, with next higher assembly.
made in the readings of instruments or test
b. Column 2, Functional Group. This column
equipment used in precise measurement. Consists
lists the noun names of components assemblies, and
of the comparison of two instruments, one of which
subassemblies on which maintenance is authorized.
is a certified standard of known accuracy, to detect
c. Column 3, Maintenance Functions. This
and adjust any discrepancy in the accuracy of the
column carries a heading for each of the main-
instrument being compared with the certified
g. Install. To set up for use in an operational
d . Column 4, Tools and Equipment. T h i s
environment such as an emplacement, site, or
column shall be used to specify by code those tools
a n d test equipment required to perform the
h. Replace. To replace unserviceable items with
designated maintenance function.
serviceable assemblies, subassemblies, or parts.
e. Column 5, Remarks. This column will list any
i. Repair. Those maintenance operations
special information or instructions required, but
necessary to restore an item to serviceable condition
defined elsewhere, and required for performance of
through correction of material damage or a specific
the designated maintenance function.