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APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. GENERAL.
a. The Maintenance Allocation Charts (MAC) in Section II assign maintenance functions in accordance with the
Three Levels of Maintenance concept for Army aviation. These maintenance levels (categories) – Aviation Unit Mainte-
nance (AVUM), Aviation Intermediate (AVIM), and Depot Maintenance – are depicted on the MAC as:
AVUM, which corresponds to an O 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) Aviation Unit Maintenance (AVUM) activities will be staffed and equipped to perform high frequency “On-
Aircraft” maintenance tasks required to retain or return aircraft systems to serviceable condition. The maintenance capabil-
ity of the AVUM will be governed by the Maintenance Allocation Chart (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 re-
quire complex adjustments or system alinement 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, capacity, and pressure checks to hydraulic systems. Perform servicing, functional adjust-
ments, 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 alinement. 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 shop 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, battalion headquar-
ters, and 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 accomplished by the aircraft crew chief or assigned aircraft repairman and will
normally be limited to preventive maintenance, inspections, servicing, spot painting, stop drilling, application of nonstress
patches, minor adjustments, module/component fault diagnosis, and replacement of selected modules/components. Repair
functions will normally be accomplished by the supporting AVIM unit.
B–1
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