TM 55-1670-251-20&P/TO 13D3-2-2
MAINTENANCE ALLOCATION CHARTS
Section I. INTRODUCTION
a. This appendix assigns maintenance functions and repair operations to be performed by the lowest
appropriate maintenance echelon. Section II defines the maintenance operations required; Section III lists the tool
and test equipment requirements and Section IV presents a list of operating supplies.
b. Columns in the maintenance allocation chart areas follows:
(1) Part or Component. This column shows only the nomenclature or standard item name, Additional
descriptive data are included only where clarification is necessary to identify the part. Components and parts
comprising a major end item are listed alphabetically. Assemblies and subassemblies are in alphabetical sequence
with their components listed alphabetically immediately below the assembly listing.
(2) Maintenance Function. This column indicates various maintenance functions allocated to the echelon
capable of performing the operation.
(a) Service. To clean, to preserve, and to replenish fuel and lubricants.
(b) Adjust. To regulate periodically to prevent malfunction.
(c) Inspect. To verify serviceability and to detect the first stage of electrical or mechanical failure
(d) Test. To verify serviceability and to detect the first stages of electrical or mechanical failure
by use of special equipment such as gages and meters.
(e) Replace. To substitute serviceable assemblies, subassemblies and parts for unserviceable
(f) Repair. To restore to a serviceable condition by replacing unserviceable parts or by any other
action required utilizing tools, equipment, and skills available, to include welding, grinding, riveting, straightening,
(g) Calibrate. To determine, check or rectify the graduation of an instrument, weapon, or weapons
system, or components of a weapons system.
(h) Rebuild. To restore to a condition comparable to new by disassembling the item to determine
the condition of its component parts and reassembling it using serviceable, rebuilt, or new assemblies, subassemblies,
(3) 1st, 2nd, 3rd, 4th, 5th Echelon. The symbol X placed in columns 1 thru 5 indicated the echelon
responsible for performing that particular maintenance operation, but does not necessarily indicate that repair parts
will be stocked at that level. Normally there will be no deviation from the assigned level of maintenance. In cases
of operational necessity, maintenance functions assigned to a maintenance level may, on a one-time basis and at the
request of the lower maintenance level, be specifically authorized by the maintenance officer of the level of maintenance
to which the function is assigned. The special tools, equipment, etc. required by the lower level of maintenance to
perform this function will be furnished by the maintenance level to which the function is assigned. This transfer of
a maintenance function to a lower maintenance level does not relieve the higher maintenance level of the responsibility
for the function. The higher level of maintenance has the authority to determine:
1) If the lower level is capable of performing the work.
2) If the lower level will require assistance or technical supervision and on-site inspection.
3) If the authorization will be granted.
(4) Tools Required. This column indicates codes assigned to individual tool, test equipment, and
maintenance equipment referenced. The grouping of codes in this column of the maintenance allocation chart indicates
the tool, test and maintenance equipment required to perform the maintenance function.
c. Columns in the allocation of tools for maintenance functions are as follows:
(1) Tools Required for Maintenance Functions. This column lists tools, test, and maintenance
equipment required to perform the maintenance functions.
(2) lst, 2nd, 3rd, .4th, 5th Echelon. To be assigned at a later date.