TM 5-3820-233-12/1
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
D - Adjust. To rectify to the extent necessary to bring
B-1. General
into proper operating range.
a. This section provides a general explanation of all
E - Aline. To adjust specified variable elements of an
maintenance and repair functions authorized at various
item to bring to optimum performance.
maintenance levels.
F - Calibrate. To determine the corrections to be
b. Section II designates overall responsibility for the
made in the readings of instruments or test equipment
performance of maintenance functions on the identified
used in precise measurement. Consists of the
end item or component. The implementation of the
comparison of two instruments, one of which is a
maintenance functions upon the end item or component
certified standard of known accuracy, to detect and
will be consistent with the assigned maintenance
adjust any discrepancy in the accuracy of the instrument
functions.
being compared with the certified standard.
c. Section III (Special Tools and Test Equipment),
G - Install. To set up for use in an operational
not applicable.
environment such as an emplacement, site, or vehicle.
d. Section IV (Supplemental Instructions), not
H - Replace. To replace unserviceable items with
applicable.
serviceable like items.
I - Repair. Those maintenance operations necessary
B-2. Explanation of Columns in Section II
to restore an item to serviceable condition through
a. Group Number, Column (1). The assembly group
correction of material damage or a specific failure.
is a numerical group assigned to each assembly in a
Repair may be accomplished at each category of
functional basis. The applicable assembly groups are
maintenance.
listed on the MAC (Maintenance Allocation Chart) in
J - Overhaul. Normally, the highest degree of
disassembly sequence beginning with the first assembly
maintenance performed by the Army in order to minimize
removed in a top down disassembly sequence.
time work in process is consistent with quality and
b. Functional Group, Column (2). This column
economy of operation. It consists of that maintenance
contains a brief description of the components of each
necessary to restore an item to completely serviceable
assembly group.
condition as prescribed by maintenance standards in
c. Maintenance Functions; Column (3). This column
technical publications for each item of equipment.
lists the various maintenance functions (A through K)
Overhaul normally does not return an item to like new,
and indicates the lowest maintenance category
zero mileage, or zero hour condition.
authorized to perform these functions. The symbol
K - Rebuild. The highest degree of materiel
designations for the various maintenance categories are
maintenance. It consists of restoring equipment as nearly
as follows:
as possible to new condition in accordance with original
C-Operator or crew
O-Organizational maintenance
manufacturing standards. Rebuild is performed only
F-Direct support maintenance
when required by operational considerations or other
H-General support maintenance
paramount factors and then only at the depot
D-Depot maintenance
maintenance category. Rebuild reduces to zero the
The maintenance functions are defined as follows:
hours or miles the equipment or component thereof, has
A - Inspect. To determine serviceability of an item by
been in use.
comparing its physical, mechanical, and electrical
d. Tools and Equipment, Column (4). This column is
characteristics with established standards.
provided for referencing by code the special tools and
B - Test. To verify serviceability and to detect
test equipment (sec. III) required to perform the
electrical or mechanical failure by use of test equipment.
maintenance functions (sec.II).
C - Service. To clean, to preserve, to charge, and to
e. Remarks, Column (5). This column is provided for
add fuel, lubricants, cooling agents, and air. If it is
referencing by code the remarks (sec. IV) pertinent to the
desired that elements, such as painting and lubricating,
maintenance functions.
be defined separately, they may be so listed.
B-1
