TM 5-3431-207-15
APPENDIX II
MAINTENANCE ALLOCATION
Section I. INTRODUCTION
3. Explanation of Columns
1. General
a. Functional Group. The functional group is a
This Appendix contains a Maintenance Allocation
Chart, listing all Maintenance and Repair Operations
numerical group set up on a functional basis. The
authorized for all echelons of responsibility and shall be
applicable functional grouping indexes are taken from
strictly adhered to.
the Corps of Engineers Functional Grouping Indexes,
and appear on the maintenance allocation chart in their
correct numerical sequence.
These indexes are
2. Maintenance
normally set up according to their proximity to each
Maintenance is any action to keep material in a
other and their function.
serviceable condition or to restore it to serviceability
when it is unserviceable. Maintenance of material
b. Components and Related Operation.
This
includes the following:
column contains the functional index grouping heading,
a. Service. To clean, to preserve and lubricate.
sub group headings, and brief description of the part
starting with the noun name. It also designates the
operation to be performed such as service, adjust,
b. Adjust.
To regulate periodically to prevent
inspect, test, replace, repair and overhaul.
malfunction.
c. Echelon Maintenance.
c. Inspect. To verify serviceability and to detect
incipient mechanical failure by scrutiny.
Column 1. First Echelon.
d. Test. To verify serviceability and to detect
First echelon maintenance is that maintenance
performed by the user or operator of the equipment,
incipient mechanical failure by use of special equipment
such as servicing, cleaning, lubricating, and limited
such as gauges, meters, and so on.
adjustments. It also includes removal and replacement
of items to accomplish servicing and lubrication.
e. Replace. To substitute serviceable assemblies,
subassemblies,
and
parts
for
unserviceable
Column 2. Second Echelon.
components.
Second echelon maintenance is that maintenance
f. Repair. To restore an item to serviceable
performed by trained personnel provided for that
purpose in the using organization, such as replacement
condition through correction of a specific failure or
of all items in column 2, limited parts fabrication from
unserviceable condition. This function includes, but is
bulk material, adjustments, and repair of assemblies,
not limited to, inspecting, cleaning, preserving,
components, and end items that can be accomplished
adjusting, replacing, welding, riveting, and straightening.
without extensive disassembly.
g. Overhaul. To restore an item to completely
Column 3. Third Echelon.
serviceable condition as prescribed by serviceability
Third echelon maintenance is that maintenance
standards developed and published by heads of
performed by specially trained units in direct support of
technical services.
This is accomplished through
the using organization, such as replacement of all items
employment or the technique of "Inspect and Repair
in columns 2 and 3, repair assemblies, components and
only as Necessary" (IROAN). Maximum utilization of
end items, and fabricate parts from bulk material.
diagnostic and test equipment is combined with
minimum disassembly of the item during the overhaul
process.
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