MAINTENANCE ALLOCATION CHART
INTRODUCTION
Section I.
istics of the item and comparing those charac-
1. General
teristics with authorized standards. Test will
This appendix contains the explanations of
be made commensurate with test procedures
all the maintenance and repair functions au-
and with calibrated tools and/or test equipment
thorized the various maintenance levels.
referenced on the MAC.
Section II, the Maintenance Allocation Chart
g. Replace. Substitute serviceable compo-
(MAC) designates overall responsibility for the
nents, assemblies, and subassemblies for un-
performance of maintenance operations. The
serviceable counter parts or remove and install
implementation of maintenance tasks upon the
the same item when required for the perform-
end item or component will be consistent with
ance of other maintenance operations.
the assigned maintenance operations.
h. Repair. Restore to a serviceable condition
Section III, Remarks contains supplemental
by replacing unserviceable parts or by any
instructions, explanatory notes, and/or illus-
other action required using available tools,
trations required for a particular maintenance
equipment and skills to include welding, grind-
operation. This section is cross-referenced to
ing, riveting, straightening, adjusting and fac-
the MAC, section II, column L.
ing.
2. Maintenance Operations
i. Overhaul Restore and end item to com-
Maintenance is any action taken to keep ma-
pletely serviceable condition as prescribed by
terial in a serviceable condition or to restore it
serviceability standards. This is accomplished
to serviceability when it is unserviceable, Main-
through employment of the technique of "In-
tenance of material includes the following:
spection and repair only as necessary"
a. Service. Operations required periodically
(IROAN). Maximum use of diagnostic and test
equipment is combined with minimum disassem-
to keep the item in proper operating condition,
bly during overhaul "overhaul" may be assigned
i.e., to clean, preserve, drain, paint, and replen-
to any level of maintenance except organiza-
ish fuel, lubricants, hydraulic, and deicing fluids
tional, provided the time, tools, equipment, re-
or compressed air supplies.
pair parts authorization, and technical skills
b. Adjust. Regulate periodically to prevent
are available at that level. Normally, overhaul
malfunction. Adjustments will be made com-
as applied to end items, is limited to depot main-
mensurate with adjustment procedures and
t e n a n c e level.
associated equipment specifications.
j. Rebuild. Restore to a condition comparable
c. Align. Adjust two or more components of
to new by disassembling to determine the con-
an electrical or mechanical system so that their
dition of each component part and reassembly
functions are properly synchronized or ad-
using serviceable, rebuilt, or new assemblies
justed.
subassemblies, and parts.
d. Calibrate. Determine, check, or rectify
the graduation of an instrument, weapon, or
3. Explanation of Columns
weapons system or components of a weapons
(See II)
system.
e. Inspect. Verify serviceability and detect
a. Functional Group Number. The functional
incipient electrical or mechanical failure by
group is a numerical group set up on a func-
close visual examination.
tional basis. The applicable functional group-
f. Test. Verify serviceability and detect in-
ing indexes (obtained from TB 750-93-1 Func-
cipient electrical or mechanical failure by meas-
tional Grouping Codes) are listed on the MAC
uring the mechanical or electrical character-
in the appropriate numerical sequence. These
AGO 8166A
