MAINTENANCE ALLOCATION CHART
The Army Maintenance System MAC
The Maintenance Allocation Chart (MAC) assigns maintenance functions in accordance with the Aviation
Maintenance concept for Army aviation. Overall authority and responsibility is designated for the performance of
maintenance functions on the identified component. The application of the maintenance function is consistent with
the capacities and capabilities of Aviation Unit Maintenance (AVUM) and Aviation Intermediate Maintenance
(AVIM) units. AVUM and AVIM maintenance assignments are shown on the MAC in column (4) as:
AVUM corresponds to an O code in the Repair Parts and Special Tools List (RPSTL).
AVIM corresponds to an F code in the RPSTL.
Use of the Maintenance Allocation Chart
Approved item names are used throughout this MAC.
Generic terms/nomenclature (if any) are expressed in
parentheses and are not to be considered as official
This Maintenance Allocation Chart assigns maintenance functions to the lowest level of maintenance. Only the
lowest level of maintenance authorized to perform a maintenance function is indicated.
If the lowest maintenance level cannot perform all tasks of any single maintenance function (e.g., repair), then the
higher maintenance level(s) that can accomplish additional tasks will also be indicated.
A maintenance function assigned to a maintenance level will be automatically authorized to be performed at any
higher maintenance level.
A maintenance function that cannot be performed at the assigned level of maintenance for any reason may be
evacuated to the next higher maintenance level. Higher maintenance levels will perform the maintenance
functions of lower maintenance levels when required by the commander who has the authority to direct such
The assignment of a maintenance function will not be construed as authorization to carry the related repair parts
or spares in stock. Information to requisition or otherwise secure the necessary repair parts will be as specified in
the associated Repair Parts and Special Tools List (RPSTL).
Maintenance functions are limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination (e.g., by sight, sound, or feel).
b. Service. Operations required periodically to keep an item in proper operating condition; e.g., to clean (includes
decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids,
c. Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
d. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. Replace is
authorized by the MAC and assigned maintenance level is shown as the 3rd position code of the SMR code.