TM 1-1730-232-13&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
SECTION I INTRODUCTION
B-1. AVIATION MAINTENANCE ALLOCATION CHART.
The Maintenance Allocation Chart (MAC) assigns maintenance functions in accordance with the Aviation Maintenance
concept for Army aviation. The maintenance levels are Aviation Unit Maintenance (AVUM), Aviation Intermediate
Maintenance (AVIM), and Depot Maintenance, described below. These maintenance levels are column headings in
Maintenance Allocation Chart, Table B-1.
AVUM
corresponds to an O code in 3rd position of SMR code in the Repair Parts and Special
Tools List (RPSTL).
AVIM
corresponds to an F code in 3rd position of SMR code in the Repair Parts and Special
Tools List (RPSTL).
DEPOT
corresponds to a D code in 3rd position of SMR code in the Repair Parts and Special
Tools List (RPSTL).
a. Aviation Unit Maintenance (AVUM). The AVUM activities are staffed and equipped to perform high frequency
"On-Aircraft" maintenance tasks required to keep aircraft systems or support systems In a serviceable condition.
Assignment of maintenance tasks to divisional company size aviation units depends on the overall maintenance
capability of the division, the requirement to conserve personnel and equipment resources, and air mobility requirements.
(1) Maintenance Capability. The maintenance capability of the AVUM is governed by the Maintenance
Allocation Chart (MAC). The maintenance capability is limited by the amount and complexity of ground support
equipment (GSE), facilities required, authorized manning strength, and critical skills available.
(2) Authorized Spares. The range and quantity of authorized spare modules/components will be consistent
with the mobility requirements dictated by the air mobility concept.
(3) Task Assignment to Company Size Aviation Units. Company size units perform preventive maintenance,
maintenance repair, and replacement tasks necessary to sustain a high level of aircraft operational readiness.
(a) The maintenance inspections and servicing tasks include preflight, daily, intermediate, periodic or
phased, and special inspections authorized by the MAC or higher headquarters.
(b) Applicable technical manual troubleshooting tasks identify the cause of equipment or system
malfunctions. Test, measurement, and diagnostic equipment (TMDE) is used as required.
(c) If no complex adjustments or system alignment is required, removal/installation tasks are used to
replace worn or damaged modules/components. All tasks are performed with available skills, tools, and ground support
equipment.
B-1
