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