TM 55-1560-307-13&P
APPENDIX B
MAINTENANCE ALLOCATION CHART
Section I. 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
(categories)
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 the 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 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 adjustments, and minor repair/replacement to
the flight control, propulsion, power train, and fuel
systems. Accomplish air frame repair that does not
require extensive disassembly, jigging, or alinement. The
manufacture of air frame 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-1