TM 9-4931-374-13&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
modules/components will be consistent with the mobility requirements B-1
B-1. MAINTENANCE ALLOCATION CHART
dictated by the air mobility concept. (Assignments of maintenance tasks to
divisional company size aviation units will consider the overall maintenance
a. This Maintenance Allocation Chart (MAC) assigns maintenance
capability of the division, the requirement to conserve personnel and
functions in accordance with the three levels of maintenance concept for
equipment resources, and air mobility requirements.)
Army aviation.
These maintenance levels (categories)-Aviation Unit
Maintenance (AVUM), Aviation Intermediate Maintenance (AVIM), and Depot
(a) Company Size Aviation Units: Perform those tasks
Maintenance-are depicted on the MAC as:
which consist primarily of preventive maintenance and maintenance repair
and replacement functions associated with sustaining a high level of aircraft
AVUM, which corresponds to an O code in the Repair Parts and
operational readiness. Perform maintenance inspections and servicing to
Special Tools List (RPSTL)
include preflight, daily, intermediate, periodic (or phased), and special
inspections as authorized by the MAC or higher headquarters. Identify the
AVIM, which corresponds to an F code in the Repair Parts and Special
cause of equipment/system malfunctions using applicable technical manual
Tools List (RPSTL)
troubleshooting instructions, built-in-test equipment (BITE), installed aircraft
instruments, or test, measurement, and diagnostic equipment (TMDE).
DEPOT, which corresponds to a D code in the Repair Parts and
Replace worn or damaged modules/components that do not require complex
Special Tools List (RPSTL)
adjustments or system alinement and which can be removed/installed with
available skills, tools, and ground support equipment. Perform operational
b. The maintenance to be performed below depot and in the field is
and continuity checks and make minor repairs to the electrical system.
described as follows:
Inspect, service and make operational, capacity, and pressure checks to
hydraulic systems. Perform servicing, functional adjustments, and minor
(1) Aviation Unit Maintenance (AVUM) activities will be staffed and
repair/replacement to the flight control, propulsion, power train, and fuel
equipped to perform high frequency "On-Aircraft" maintenance tasks required
systems. Accomplish air frame repair that does not require extensive
to retain or return aircraft systems to a serviceable condition.
The
disassembly, jigging, or alinement. The manufacture of air frame parts will be
maintenance capability of the AVUM will be governed by the Maintenance
limited to those items which can be fabricated with tools and equipment found
Allocation Chart (MAC) and limited by the amount and complexity of ground
in current air mobile tool and shop sets.
support equipment (GSE), facilities required, authorized manning strength,
and critical skills available. The range and quantity of authorized spare
B-1
