MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
a. This section provides a general explanation of all
(3) Service. Operations required periodically to keep
maintenance and repair functions authorized at various
an item in proper operating condition, i.e., to clean,
b. Section II designates overall responsibility for the
fuel/lubricants/hydraulic fluids or compressed air
performance of maintenance functions on the identified
end item or component. The implementation of the
(4) Adjust. Maintain within prescribed limits by
maintenance functions upon the identified end item or
bringing into proper or exact position, or by set-ting the
component will be consistent with the assigned
operating characteristics to the specified parameters.
(5) Align. To adjust specified variable elements of
c. Section III lists the tools and test equipment
an item to bring about optimum or desired performance.
required for each maintenance function as referenced
(6) Calibrate. To determine and cause corrections to
from Section II.
be made or to be adjusted on instruments or test
d. Section IV contains supplemental instructions or
measuring and diagnostic equipment used in precision
explanatory notes for a partial maintenance function.
Consists of comparisons of two
instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy in
C-2. Explanation of Columns in Section II.
the accuracy of the instrument being compared.
(7) Install. The act of emplacing, seating, or fixing
a. Group Number, Column (1). A number is
into position an item, part, or module (component or
assigned to each group in a top-down breakdown
assembly) in a manner to allow the pro-per functioning of
sequence. The applicable groups are listed in the MAC
an equipment or system.
in disassembly sequence beginning with the first group
(8) Replace. The act of substituting a serviceable
like type part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
b. Assembly Group, Column (2). This column
(9) Repair. The application of maintenance services
contains a brief description of the components of each
(inspect, test, service, adjust, align, calibrate, or replace)
or other maintenance actions (welding, grinding, riveting,
straightening, facing, remachining or resurfacing) to
c. Maintenance Functions, Column (3).
restore serviceability to an item by correcting specific
column lists the functions to be performed on the items
damage, fault, malfunction, or failure in a part,
listed in Column 2. The lowest maintenance level
subassembly, module (component or assembly), end
authorized to perform these functions is indicated by a
item, or system.
symbol in the appropriate column.
That maintenance effort
designators for the various maintenance levels are as
(service/action) necessary to restore an item to a
C-Operator or crew.
prescribed by maintenance standards (i.e., DMWR) in
appropriate technical publications. Overhaul is normally
F-Direct Support Maintenance.
the highest degree of maintenance performed by the
H-General Support Maintenance.
Army. Overhaul does not normally return an item to a
The maintenance functions are defined as follows:
(1) Inspect. To determine serviceability of an item by
comparing its physical, mechanical, and electrical
characteristics with established standards through
(2) Test. To verify serviceability and detect incipient
failure by measuring the mechanical or electrical
characteristics of an item and comparing those
characteristics with prescribed standards.