Section I. INTRODUCTION
diagnostic and test equipment is combined with
minimum disassembly of the item during the overhaul
This appendix contains explanations of all
maintenance and repair functions authorized for the
h. Repair. To restore an item to serviceable
condition through correction of a specific failure or
unserviceable condition. This function includes but is not
limited to, inspecting, cleaning, preserving, adjusting,
replacing, welding, riveting, and straightening.
Maintenance is any action taken to keep materiel
in a serviceable condition or to restore it to serviceability
3. Explanation of Columns
when it is unserviceable. Maintenance of materiel
a. Functional Group. The functional group is a
includes the following:
numerical group set up on a functional basis. The
a. Service. To clean, to preserve, and to
applicable functional grouping indexes are taken from
the Corps of Engineers Functional Grouping Indexes,
b. Adjust. To regulate periodically to prevent
and appear on the maintenance allocation chart in their
correct numerical sequence.
These indexes are
c. Inspect. To verify serviceability and to
normally set up according to their proximity to each other
detect incipient mechanical failure by scrutiny.
and their function.
d. Test. To verify serviceability and to detect
incipient mechanical failure by use of special equipment
b. Components and Related Operation. This
such as gages, meters, and so on.
column contains the functional index group heading,
To substitute serviceable
subgroup headings, and a brief description of the part
assemblies, sub-assemblies, and parts for unserviceable
starting with the noun name. it also designates the
operations to be performed such as service, adjust,
Rebuild. To restore an item to a standard
inspect, test, replace, repair, and overhaul.
as near as possible to original or new condition in
c. Echelons of Maintenance. This column
appearance, performance and life expectancy. This is
contains the various echelons of maintenance by number
accomplished through the maintenance technique of
designation. An X placed in the appropriate echelon
complete disassembly of the item, inspection of all parts
column and in line with an indicated maintenance
or components, repair or replacement of worn or
function, authorizes the particular echelon to perform the
unserviceable elements using original manufacturing
function. The symbol X indicates the lowest echelon
tolerances and/or specifications and subsequent
responsible for performing that particular function. The X
reassembly of the item.
does not necessarily indicate repair parts will be stocked
g. Overhaul. To restore an item to completely
at that level.
Echelons higher than the echelon
serviceable condition as prescribed by serviceability
annotated by X are authorized to perform the indicated
standards developed and published by heads of
This is accomplished through
employment of the technique of "inspect and repair only
as necessary" (IROAN).
Maximum utilization of