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 APPENDIX C
MAINTENANCE ALLOCATION CHART (MAC)
Section I. INTRODUCTION
incipient failure by measuring the mechanical or electrical
C-1. General
characteristics of an item and comparing those characteristics
a. This section provides a general explanation of all
with prescribed standards.
maintenance and repair functions authorized at the various
C. Service. Operations required periodically to keep on
maintenance levels.
time in proper operating condition, i.e., to clean, to preserve,
to drain, to paint, or to replenish fuel, lubricants, hydraulic
performance of maintenance functions on the identified end
fluids, or compressed air supplies.
item or component and the work measurement time required
D. Adjust. To maintain within prescribed limits, by
to perform the functions by the designated maintenance level.
bringing into proper or exact position, or by setting the
The implementation of the maintenance functions upon the
operating characteristics to specified parameters.
end item or component will be consistent with the assigned
E. Align. To adjust specified variable elements of an
maintenance functions.
item to bring about optimum or desired performance.
F. Calibrate. To determine and cause corrections to be
required for each maintenance function as referenced from
made or to be adjusted on instruments or test measuring and
diagnostic equipments used in precision measurement.
Consists of comparisons of two instruments, one of which is
explanatory notes for a particular maintenance function.
a certified standard of known accuracy, to detect and adjust
any discrepancy in the accuracy of the instrument being
C-2. Explanation of Columns in Section II
compared.
a. Column 1. Group Number. A number is assigned to
G. Install. The act of emplacing, seating, or fixing into
each group in a top down breakdown sequence. The
position an item, part, or module (component or assembly) in
applicable groups are listed on the MAC in disassembly
a manner to allow the proper functioning of an equipment or
sequence, beginning with the first group removed.
system.
b. Column 2. Functional Group. This column contains
H. Replace. The act of substituting a serviceable like
a brief description of the components of each numerical
type part, subassembly, or module (component or assembly)
group.
for an unserviceable counterpart.
c. Column 3. Maintenance Functions. This column
I. Repair. The application of maintenance services
lists the various maintenance functions (A through K). The
(inspect, test, service, adjust, align, calibrate, or replace) or
lowest maintenance level authorized to perform these
other maintenance actions (welding, grinding, riveting,
functions is indicated by a symbol in the appropriate column.
straightening, facing, remachining, or resurfacing) to restore
Work measurement time standards (the active repair time
serviceability to an item by correcting specific damage, fault,
required to perform the maintenance function) are shown
malfunction. or failure in a part, subassembly module
directly below the symbol identifying the maintenance level.
(component or assembly}, end item, or system.
The symbol designations for the various maintenance levels
J. Overhaul. That maintenance effort (service/action)
are as follows:
necessary to restore an item to a completely
C-Operator or crew.
serviceable/operational
condition
as
prescribed
by
O- Organizational maintenance.
maintenance standards (i.e., DMWR) in appropriate technical
F--Direct support maintenance.
publication. Overhaul is normally the highest degree of
H-General support maintenance.
maintenance performed by the Army. Overhaul does not
D- Depot maintenance.
normally return an item to like new condition.
The maintenance functions are defined as follows:
A. Inspect. To determine serviceability ot an item by
comparing its physical, mechanical, and electrical
characteristics
with
established
standards
through
examination.
B. Test. To verify serviceability and detect
C-1
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