MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. Maintenance Allocation 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 0 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.
(Assignment of maintenance tasks to divisional company size aviation units will consider the overall maintenance
capability of the division, the requirement to conserve personnel and equipment resources and air mobility requirements).
(a) Company Size Aviation Units.
Perform those tasks which consist primarily of preventive
maintenance and maintenance repair and replacement functions associated with sustaining a high level of equipment
Perform maintenance inspections and servicing to include daily, intermediate, periodic and
special inspections as authorized by the MAC or higher headquarters.
Identify the cause of equipment/system
malfunctions using applicable technical manual troubleshooting instructions, Built-In-Test Equipment (BITE), installed
instruments, or easy to use Test Measurement and Diagnostic Equipment (TMDE). Replace