MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
ability standards developed and published by
1. General
heads of technical services. This is accom-
This appendix maintenance and repair func-
plished through employment of the technique
tions authorized the various echelons. Section
of "Inspect and Repair Only as Necessary"
II contains the Maintenance Allocation Chart
(IROAN). Maximum utilization of diagnostic
(MAC).
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-
terial in a serviceable condition or to restore
3. Explanation of Columns
it to serviceability when it is unserviceable.
a. Functionul Group. The functional group is
Maintenance of material includes the following:
a numerical group set up on a functional basis.
a. Service. To clean, preserve, and replenish
The applicable Functional Grouping Indexes
fuel and lubricants.
(obtained from the Corps of Engineers Func-
b. Adjust. To regulate periodically to pre-
tional Grouping Indexes) are listed on the MAC
vent malfunction.
in the appropriate numerical sequence. These
c. Inspect. To verify serviceability and de-
indexes are normally set up in accordance with
tect incipient electrical or mechanical failure
their function and proximity to each other.
by scrutiny.
b. Components and Related Operation. This
d. Test. To verify serviceability and detect
column contains the Functional Grouping Index
incipient electrical or mechanical failure by use
heading, subgroup headings, and a brief de-
of special equipment such as gages, meters, and
scription of the part, starting with the noun
the like.
name. It also designates the operations to be
e. Replace. To substitute serviceable assem-
performed such as service, adjust, inspect, test,
blies, subassemblies, and parts for unservice-
replace, repair, and overhaul.
able components.
c. Echelons of Maintenance. This column
f. Repair. To restore an item to serviceable
contains the various echelons of maintenance
condition through correction of a specific fail-
by number designation. An X placed in the
ure or unserviceable condition. This function
appropriate echelon column in line with an in-
includes, but is not limited to, inspecting, clean.
dicated maintenance function authorizes that
ing, preserving, adjusting, replacing, welding,
echelon to perform the function. The X indi-
riveting, and straightening.
cates the lowest echelon responsible for per-
g. Aline. To adjust two or more components
forming the function, but does not necessarily
of an electrical system so that their functions
indicate repair parts stockage at that level.
are properly synchronized.
Higher echelons are authorized to perform the
h. Calibrate. To determine, check, or rectify
indicated functions of lower echelons.
the graduation of an instrument, weapon, or
d. Remarks. This column lists specific main-
weapons system, or components of a weapons
system.
tenance functions, special tools, cross-references
i. Overhaul. To restore an item to completely
instructions, and the like pertinent to the op-
serviceable condition as prescribed by service-
eration being performed.
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