MAINTENANCE ALLOCATION CHART
SECTION I INTRODUCTION
B-1 . MAINTENANCE ALLOCATION A CHART.
a. This Maintenance Allocation Chart (MAC) assigns maintenance functions in accordance with the
Three Levels of Maintenance concept for army aircraft. These maintenance levels: Aviation Unit
Maintenance (AVUM), Aviation Intermediate Maintenance (AVIM), and Depot Maintenance are
depicted on the MAC as:
AVUM which corresponds to the O code in the Repair Parts and Special Tools List (RPSTL).
AVIM which corresponds to the F code in the Repair Parts and Special Tools List (RPSTL).
Depot which corresponds to the D code in the Repair Parts and Special Tools List (RPSTL).
b. The maintenance to be performed below depot and in the field is described as follows:
(1) Aviation Unit Maintenance (AVUM). AVUM activities will be staffed and equipped to
perform high frequency On-Equipment maintenance tasks required to retain or return equipment to a
serviceable condition. The maintenance capability of the AVUM will be governed by the MAC and
limited by the amount and complexity of support equipment, facilities required, and number of spaces
and critical skills available. The range and quantity of authorized spare modules/components will be
consistent with the mobility requirements dictated by the air mobility concept.
(2) Aviation Intermediate Maintenance (AVIM). AVIM provides mobile, responsive One Stop
maintenance support. (Maintenance functions which are not conductive to sustaining air mobility will
be assigned to depot maintenance.) Performs all maintenance functions authorized to be done at
AVUM. Repair of equipment for return to user will emphasize support or operational readiness re-
quirements. Authorized maintenance includes replacement and repair of modules/components and end
items which can be accomplished efficiently with available skills, tools, and equipment. Establishes the
Direct Exchange (DX) program for AVUM units by repairing selected items for return to stock when
such repairs cannot be accomplished at the AVUM level. Inspects, troubleshoots, tests, diagnoses,
repairs, adjusts, calibrates, and aligns system modules/components. Module/component disassembly
and repair will support the DX program and will normally be limited to tasks requiring cleaning and
the replacement of seals, fittings and items of common hardware. Unserviceable reparable modules/
components and end items which are beyond the capability of AVIM to repair will be evacuated to
Depot Maintenance. This level will perform special inspections which exceed AVUM capability.
Provides quick response maintenance support, on-the-job training, and technical assistance through the
use of mobile maintenance contact teams. Maintenance authorized operational readiness float. Provides
collections and classification services for serviceable/unserviceable material. Operates a cannibaliza-
tion activity in accordance with AR 750-50.
(3) At AVIM level, complex electronic repair and testing are performed by Calibration Repair
Center (CRC) personnel of The Army TMDE Support Team (ATST).