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TM 55-4920-412-13&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 aircraft.
These maintenance levels: Aviation Unit Maintenance
(AVUM), Aviation Intermediate Maintenance (AVIM) and
Depot Maintenance are depicted on the MAC as:
AVUM WHICH CORRESPONDS TO THE O CODE
IN THE REPAIR PARTS AND SPECIAL TOOLS LIST
(RBT)
AVIM WHICH CORRESPONDS TO THE F CODE
IN THE REPAIR PARTS AND SPECIAL TOOLS LIST
(RBT)
DEPOT WHICH CORRESPONDS TO THE D CODE
IN THE REPAIR PARTS AND SPECIAL TOOLS LIST
(RBT)
b.
The maintenance to be performed below depot
and in the field is described as follows:
(1)
Aviation Unit Maintenance (AVUM) AVUM
activities will be staffed and equipped to perform high
frequency "On-Equipment" maintenance tasks required
to retain or return equipment to a serviceable condition.
The maintenance capability of the AVUM will be
governed by the MAC and limited by the amount and
complexity of support equipment, facilities required, and
number of spaces 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. (Assignment 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
equipment operational readiness. Perform maintenance
inspections and servicing to include daily, intermediate,
periodic 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 instruments, or easy to
use Test Measurement and Diagnostic Equipment
(TMDE).
Replace
worn
or
damaged
modules/components which do not require complex
adjustments or system alignment and which can be
removed/installed
with
available
skills,
tools
and
equipment. Perform operational and continuity checks
and make minor repairs. Perform servicing, functional
adjustments, and minor repair/replacement. 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 headquarters and detachment size units are
normally small and have less than ten aircraft assigned.
Maintenance tasks performed by the aircraft crew chief
or assigned aircraft repairman will normally be limited to
preventive maintenance, inspections, servicing, spot
painting, stop drilling, minor adjustments, module/
component fault diagnosis and replacement of selected
modules/components. Repair functions will normally be
accomplished by the supporting AVIM unit.
(2)
Aviation Intermediate Maintenance (AVIM)
AVIM
provides
mobile,
responsive
"One
Stop"
maintenance support. (Maintenance functions which are
not conducive to sustaining air mobility will be assigned
to depot maintenance). Performs all maintenance
functions authorized to be done at AVUM. Repair of
equipment for return to user will emphasize support or
operational
readiness
requirements.
Authorized
maintenance
includes
replacement
and
repair
of
modules/ components and end items which can be
accomplished efficiently with available skills, tools, and
equipment. Establishes the Direct Exchange (DX)
program for AVUM units by repairing selected items for
return
to
stock
when
such
repairs
cannot
be
accomplished
at
the
AVUM
level
Inspects,
troubleshoots, tests, diagnoses,
B-1
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