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Page Title:
Appendix C: MAINTENANCE ALLOCATION CHART |
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 TM 5-4120-273-15
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
The maintenance functions are defined as follows:
C-1. General
A-Inspect: To determine serviceability of an
a. This section provides a general explanation
item by comparing its physical, mechanical,
of all maintenance and repair functions author-
and electrical characteristics with established
ized at various maintenance levels.
standards.
b. Section II designates overall responsibility
B-Test: To verify serviceability and to detect
for the performance of maintenance functions on
electrical or mechanical failure by use of test
the identified end item or component. The imple-
equipment.
mentation of the maintenance functions upon the
C-Service: To clean, to preserve, to charge, to
end item or component will be consistent with the
paint, and to add fuel, lubricants, cooling
assigned maintenance functions.
agents, and air.
c. Section III lists the special tools and test
D-Adjust: To rectify to the extent necessary to
equipment required for each maintenance func-
bring into proper operating range.
tion as referenced from Section II.
E-Aline: To adjust specified variable elements
d. Section IV contains supplemental instruc-
of an item to bring to optimum performance.
tions, explanatory notes and/or illustrations re-
F-Calibrate: To determine the corrections to be
quired for a particular maintenance function.
made in the readings of instruments or test
equipment used in precise measurement. Con-
sists of the comparisons of two instruments,
C-2. Explanation of Columns in Section II
one of which is a certified standard of known
a. Group Number, Column (1). The function-
accuracy, to detect and adjust any discrepancy
al group is a numerical group set up on a func-
in the accuracy of the instrument being com-
tional basis. The applicable functional grouping
pared with the certified standard.
indexes (obtained from TB 750-93-1, Functional
G-Install: To set up for use in an operational
Grouping Codes) are listed on the MAC (Main-
environment such as an emplacement, site, or
tenance Allocation Chart) in the appropriate
vehicle.
numerical sequence. These indexes are normally
H-Replace: To replace unserviceable items with
set up in accordance with their function and prox-
serviceable assemblies, subassemblies, or
imity to each other.
parts.
b. Functional Group, Column (2). This col-
I-Repair: To restore an item to serviceable con-
umn contains a brief description of the compo-
dition. This includes, but is not limited to, in-
nents of each functional group.
spection, cleaning, preserving, adjusting, re-
placing, welding, riveting, and strengthening.
c. Maintenance Functions, Column (3). This
J-Overhaul: To restore an item to a completely
column lists the various maintenance functions
serviceable condition as prescribed by mainte-
(A through K) and indicates the lowest mainte-
nance serviceability standards using the In-
nance category authorized to perform these func-
spect and Repair Only as Necessary (IROAN)
tions. The symbol designations for the various
technique.
maintenance categories are as follows:
K-Rebuild: To restore an item to a standard as
C-Operator or crew
nearly as possible to original or new condi-
O-Organizational maintenance
tion in appearance, performance, and life ex-
F-Direct support maintenance
pectancy. This is accomplished through com-
H-General support maintenance
D-Depot maintenance
plete disassembly of the item, inspection of
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