MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
electrical characteristics with established standards through
a. This section provides a general explanation of all
B. Test: To verify serviceability- and detect incipient
maintenance and repair functions authorized at various
failure by measuring the mechanical or electrical
characteristics of an item and comparing those
b. Section II designates overall responsibility for the
characteristics with prescribed standards.
performance of maintenance functions on the identified
C. Service: Operations required periodically to keep an
end item or component and the work measurement time
item in proper operating condition, i.e., to clean, to
required to perform the functions by the designated
preserve, to drain, to paint, or to replenish fuel, lubricants,
The implementation of the
hydraulic fluids, or compressed air supplies.
maintenance functions upon the end item or component
will be consistent with the assigned maintenance functions.
D. Adjust: To maintain within prescribed limits, by
bringing into proper or exact position, or by setting the
operating characteristics to specified parameters.
required for each maintenance function as referenced from
E. Aline: To adjust specified variable elements of an
item to bring about optimum or desired performance.
d. Section IV contains supplemental instructions or
explanatory notes for a particular maintenance function.
F. Calibrate. To determine and cause corrections to
be made or to be adjusted on instruments or test
B-2. Explanation of Columns in Section II
measuring and diagnostic equipments used in precision
a. Column (1), Group Number. A number is assigned
Consists of comparisons of two
to each group in a top down breakdown sequence. The
instruments, one of which is a certified standard of known
applicable groups are listed on the MAC in disassembly
accuracy, to detect and adjust any discrepancy in the
sequence beginning with the first group removed.
accuracy of the instrument being compared.
b. Column (2), Functional Group.
G. Install: The act of emplacing, seating, or fixing into
contains a brief description of the components of each
position an item, part, or module (component or assembly)
in a manner to allow the proper functioning of an
c. Column (3), Maintenance Functions. This column
equipment or system.
lists the various maintenance functions (A through K). The
H. Replace: The act of substituting a serviceable like
lowest maintenance level authorized to perform these
type part, subassembly, ox module (component or
functions is indicated by a symbol in the appropriate
assembly; for an unserviceable counterpart.
column. Work measurement time standards (the active
Repair: The application of maintenance services
repair time required to perform the maintenance function)
(inspect, test, service, adjust, align, calibrate, or replace) or
are shown directly below the symbol identifying the
other maintenance actions (welding, grinding, riveting,
maintenance level. The symbol designations for the
straightening, facing, remachining or resurfacing) to restore
various maintenance levels are as follows:
serviceability to an item by correcting specific damage,
C-Operator or crew
fault, malfunction, or failure in a part, subassembly, module
(component or assembly), end item, or system.
F-Direct support maintenance
J. Overhaul: That maintenance effort (service/action)
H-General support maintenance
necessary to restore an item to a
The maintenance functions are defined as follows:
A. Inspect: To determine serviceability of an item by
comparing its physical, mechanical, and