TM 5-4310-278-15
MAINTENANCE ALLOCATION CHART
INTRODUCTION
Section I.
for the various maintenance categories are as
B-1. General
follows:
a. This section provides a general explana-
tion of all maintenance and repair functions
C - Operator crew
authorized at various maintenance levels.
O - Organizational maintenance
F - Direct support maintenance
b. Section II designates overall responsibili-
H - General support maintenance
ty for the performance of maintenance func-
D - Depot maintenance
tions on the identified end item or component.
The maintenance functions are defined as
The implementation of the maintenance func-
follows:
tions upon the end item or component will be
consistent with the assigned maintenance func-
A-Inspect: To determine serviceability of an
tions.
item by comparing its physical, mechanical,
c. Section III lists the special tools and test
and electrical characteristics with estab-
equipment required for each maintenance
lished standards.
function as referenced from section II.
B-Test: To verify serviceability and to detect
d. Section IV contains supplemental in-
electrical or mechanical failure by use of
structions, explanatory notes and/or illustra-
test equipment.
tions required for a particular maintenance
C-Service: To clean, to preserve, to charge,
function.
to paint, and to add fuel, lubricants, cool-
ing agents, and air.
B-2. Explanation of Columns in Section II
D-Adjust: To rectify to the extent necessary
a. Group Number, Column (1). The func-
to bring into proper operating range.
tional group is a numerical group set up
E-Aline: To adjust specified variable ele-
on a functional basis. The applicable function-
ments of an item to bring to optimum per-
al grouping indexes (obtained from TB 750-
formance.
93-1, Functional Grouping Codes) are listed
F-Calibrate: To determine the corrections to
on the MAC (Maintenance Allocation Chart)
be made in the readings of instruments
in the appropriate numerical sequence. These
or test equipment used in precise measure-
indexes are normally set up in accordance with
ment. Consists of the comparisons of two
their function and proximity to each other.
instruments, one of which is a certified
b. Functional Group, Column (2). This
standard of known accuracy, to detect and
column contains a brief description of the com-
adjust any discrepancy in the accuracy of
ponents of each functional group.
the instrument being compared with the
c. Maintenance Functions, Column (3).
certified standard.
This column lists the various maintenance
functions (A through K) and indicates the
G-Install: To set up for use in operational
lowest maintenance category authorized to per-
environment such as an emplacement, site
form these functions. The symbol designations
or vehicle.
