TM 1-4220-250-12&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
SECTION 1. 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 aviation. These maintenance levels - Aviation Unit Maintenance (AVUM, Aviation
Intermediate Maintenance (AVIM), and Depot Maintenance - are depicted on the MAC as:
AVUM, which corresponds to an 0 Code in the Repair Parts and Special Tools List (RPSTL)
AVIM, which corresponds to an F Code in the Repair Parts and Special Tools List (RPSTL)
DEPOT, which corresponds to a 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) AVUM activities will be staffed and equipped to perform high frequency On-Aircraft maintenance tasks
required to retain or return aircraft systems to a serviceable condition. The maintenance capability of AVUM
will be governed by the MAC and limited by the amount and complexity of ground support equipment (GSE),
facilities required, authorized manning strength, 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. (Assignments 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 aircraft
operational readiness. Perform maintenance inspections and servicing to include preflight, daily,
intermediate, periodic (or phased), 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 aircraft instruments, or test,
measurement, and diagnostic equipment (TMDE). Replace worn or damaged modules/components that
do not require complex adjustments or system alignment and which can be removed/installed with
available skills, tools, and ground support equipment. Perform operational and continuity checks and
make minor repairs to the electrical system. Inspect, service and make operational, check capacity and
pressure of hydraulic systems. Perform servicing, functional adjustments, and minor repair/replacement
to the flight control, propulsion, power train, and fuel systems. Accomplish airframe repair that does not
require extensive disassembly, jigging, or alignment The manufacture of airframe parts will be limited to
those items which can be fabricated with tools and equipment found in current air mobile tool and ship
sets. Evacuate unserviceable modules/components and end items beyond the repair capability of AVUM
to the supporting AVIM.
(b) Less than Company Size Aviation Units: Aviation elements organic to brigade, group, and battalion
headquarters, and other detachment size units are normally small and have less than ten aircraft
assigned. Maintenance tasks performed by these units will be those which can be
B-1
