This appendix contains a maintenance allocation
chart listing all maintenance and repair operations
the various echelons.
Maintenance is any action taken to keep materiel
in a serviceable condition or to restore it to serviceability
when it is unserviceable. Maintenance of materiel
includes the following:
a. Service. To clean, to preserve, and to
replenish fuel and lubricants.
b. Adjust. To regulate periodically to prevent
c. Inspect. To verify serviceability and to detect
incipient mechanical failure by scrutiny.
d. Test. To verify serviceability and to detect
incipient mechanical failure by use of special equipment
such as gages, meters, and so on.
assemblies, subassemblies, and parts for unserviceable
f. Repair. To restore an item to serviceable
condition through correction of a specific failure or
unserviceable condition. This function includes but is
adjusting, replacing, welding, riveting, and straightening.
g. Overhaul. To restore an item to completely
serviceable condition as prescribed by serviceability
standards developed and published by heads of
technical services. This is accomplished through
employment of the technique of "inspect and repair only
as necessary" (IROAN). Maximum utilization of
diagnostic and test equipment is combined with
minimum disassembly of the item during the overhaul
3. Explanation of Columns
a. Functional Group. The functional group is a
numerical group set up on a functional basis. The
applicable functional grouping indexes are taken from
the Corps of Engineers Functional Grouping Indexes,
and appear on the Maintenance Allocation Chart in their
correct numerical sequence. These indexes are
normally set up according to their proximity to each
other and their function.
b. Components and Related Operation. This
column contains the functional index grouping heading,
subgroup headings, and a brief description of the part
starting with the noun name. It also designates the
operation to be performed such as service, adjust,
inspect, test, replace, repair, and overhaul.
c. Echelon Maintenance.
performed by the user or operator of
the equipment, such as servicing,
adjustments. It also includes removal
accomplish servicing and lubricating.
(2). Second Echelon. Second echelon
provided for that purpose in the using
organization, such as replacement of
all items in column 2, limited parts
adjustments, and repair on assemblies,
components, and end items that can
be accomplished without extensive
performed by specially trained units in