TM 55-4920-384-13&P
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
Test Measurement and Diagnostic Equipment
B-1. Maintenance Allocation Chart.
(TMDE). Replace worn or damaged modules/com-
a. This Maintenance Allocation Chart (MAC)
ponents which do not require complex adjustments
assigns maintenance functions in accordance with
or system alignment and which can be remov-
the Three Levels of Maintenance concept for army
ed/installed with available skills, tools and equip-
aircraft. These maintenance leve1: Aviation Unit
ment. Perform operational and continuity checks
Maintenance (AVUM), Aviation Intermediate
and make minor repairs. Perform servicing, func-
Maintenance (AVIM) and Depot Maintenance are
tional adjustments, and minor repair/replacement.
dipicted on the MAC as:
Evacuate unserviceable modules/components and
AVUM which corresponds to the O code in the
end items beyond the repair capability of AVUM
Repair Parts and Special Tools List (RPSTL).
to the supporting AVIM.
AVIM which corresponds to the F code in the
(b) Less than Company Size Aviation Units.
Repair Parts and Special Tools List (RPSTL).
Aviation elements organic to brigade, group, bat-
talion headquarters and detachment size units are
DEPOT which corresponds to the D code in the
normally small and have less than ten aircraft
Repair Parts and Special Tools List (RPSTL).
assigned. Maintenance tasks performed by the air-
b. The maintenance to be performed below depot
craft crew chief or assigned aircraft repairman will
and in the field is described as follows:
normally be limited to preventive maintenance, in-
(1) Aviation Unit Maintenance
spections, servicing, spot painting, stop drilling,
(AVUM). AVUM activities will be staffed and
minor adjustments, module/component fault
equipped to perform high frequency "On- Equip-
diagnosis a n d r e p l a c e m e n t o f s e l e c t e d
ment" maintenance tasks required to retain or
modules/components. Repair functions will nor-
return equipment to a serviceable condition. The
mally be accomplished by the supporting AVIM
maintenance capability of the AVUM will be
unit.
governed by the MAC and limited by the amount
and complexity of support equipment, facilities re-
quired, and number of spaces and critical skills
(2) Aviation Intermediate Maintenance
available. The range and quantity of authorized
(AVIM). AVIM provides mobile, responsive "One
spare modules/components will be consistent with
Stop" maintenance support, (Maintenance func-
the mobility requirements dictated by the air
tions which are not conducive to sustaining air
mobility concept. (Assignment of maintenance
mobility will be assigned to depot maintenance).
tasks to divisional company size aviation units
Performs all maintenance functions authorized to
will consider the overall maintenance capability of
be done at AVUM. Repair of equipment for return
the division, the requirement to conserve person-
to user will emphasize support or operational
nel and equipment resources and air mobility re-
readiness requirements. Authorized maintenance
quirements).
includes replacement and repair of modules/com-
ponents and end items which can be accomplished
(a) Company Size Aviation Units. Perform
efficiently with available skills, tools, and equip-
those tasks which consist primarily of preventive
ment. Establishes the Direct Exchange (DX) pro-
maintenance and maintenance repair and replace-
gram for AVUM units be repairing selected items
ment functions associated with sustaining a high
for return to stock when such repairs cannot be ac-
level of equipment operational readiness. Perform
complished a t t h e A V U M l e v e l . Inspects,
maintenance inspections and servicing to include
troubleshoots, test, diagnoses, repairs, adjusts,
daily, intermediate, periodic and special inspec-
calibrates, a n d aligns system modules/com-
tions as authorized by the MAC or higher head-
ponents. Module/component disassembly and
quarters. Identify the cause of equipment/system
repair will support the DX program and will nor-
malfunctions using applicable technical manual
mally be limited to tasks requiring cleaning and
troubleshooting instructions, Built-In-Test Equip-
ment (BITE), installed instruments, or easy to use
