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TM 1-6625-735-14
MAINTENANCE ALLOCATION CHART
SECTION
Introduction
I.
B.1.
MAINTENANCE ALLOCATION CHART.
a.
This Maintenance Allocation Chart (MAC) assigns maintenance functions in accordance with the Aviation
Maintenance concept for Army aviation. These maintenance levels - Unit Maintenance (AVUM), Direct Support
(AVIM), and Depot Maintenance - are depicted on the MAC as:
AVUM -
corresponds to an O code
in the Repair Parts and
Special
Tools
List
(RPSTL).
AVIM -
corresponds to an F code
in the Repair Parts and
Special
Tools
List
(RPSTL).
DEPOT -
corresponds to a D code in
the Repair Parts and Spe-
cial 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
9On-Aircraft9 maintenance tasks required to retain or return aircraft systems to a serviceable condition. The
maintenance capability 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
requirements to conserve personnel and equipment resources, and air mobility requirements.)
(a)
Company Size Aviation Units: Perform those tasks which consist primarily of preventive mainte-
nance 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,
capacity, and pressure checks to 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

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