TM 5-3431-200-15
A P P E N D I X II
MAINTENANCE
ALLOCATION
Section I. INTRODUCTION
1. General
ability standards developed and published by
heads of technical services. This is accom-
This appendix contains explanations of all
plished through employment of the technique
maintenance and repair functions authorized
of "Inspect and Repair Only as Necessary"
for the various echelons. Section II contains
(IROAN). Maximum utilization of diagnostic
the Maintenance Allocation Chart.
and test equipment is combined with minimum
disassembly of the item during the overhaul
2. Maintenance
process.
Maintenance is any action taken to keep ma-
teriel in a serviceable condition or to restore it
3. Explanation of Columns
to serviceability when it is unserviceable.
a. Functional Group. The functional group
Maintenance of materiel includes the fol-
is a numerical group set up on a functional
lowing:
basis. The applicable Functional Grouping In-
a. Service, To clean, preserve, and replen-
dexes (obtained from the Corps of Engineers
ish fuel and lubricants.
Functional Grouping Indexes) are listed on the
b. Adjust. To regulate periodically to pre-
MAC in the appropriate numerical sequence.
vent malfunction.
These indexes are normally set up in accord-
c. Inspect. To verify serviceability and de-
ance with their function and proximity to each
tect incipient electrical or mechanical failure by
other.
scrutiny,
d. Test. To verify serviceability and detect
b. Components and Related Operation. This
incipient electrical or mechanical failure by use
column contains the Functional Grouping In-
of special equipment such as gages, meters, and
dex heading, subgroup headings, and a brief
the like.
description of the part starting with the noun
e. Replace. To substitute serviceable assem-
name. It also designates the operations to be
blies, subassemblies, and parts for unserv-
performed such as service, adjust inspect, test
iceable components.
replace, repair, and overhaul.
f. Repair. To restore an item to serviceable
c. Echelons of Maintenance. This column
condition through correction of a specific fail-
contains the various echelons of maintenance
ure or unserviceable condition. This function
by number designation. An X placed in the ap-
includes, but iS not limited to, inspecting, clean-
propriate echelon column in line with an indi-
ing, preserving, adjusting, replacing, welding,
cated maintenance function authorizes that ech-
riveting, and straightening.
elon to perform the function. The "X" indicates
g. Aline. To adjust two or more compo-
the lowest echelon responsible for performing
nents of an electrical system so that their func-
the function, but does not necessarily indicate
tions are properly synchronized.
repair parts stockage at that level. Higher ech-
h. Calibrate. To determine, check, or rectify
elons are authorized to perform the indicated
the graduation of an instrument, weapon, or
functions of lower echelons.
weapons system, or components of a weapons
d. Remarks. This column lists specific main-
system.
tenance functions, special tools, cross-refer-
i. Overhaul. To restore an item to completely
ences, instructions, and the like pertinent to
serviceable condition as prescribed by service-
the operation being performed.
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