MAINTENANCE ALLOCATION CHART
THREE LEVELS OF MAINTENANCE CONCEPT
B-1. MAINTENANCE ALLOCATION CHART.
modules/components and end items beyond the re-
pair capability of AVUM to the supporting AVIM.
a. This Maintenance Allocation Chart (MAC) as-
(b) Less than Company Size Aviation Units:
signs maintenance functions in accordance with the
Three Levels of Maintenance concept for army air-
Aviation elements organic to brigade, group, battalion
headquarters and detachment size units are normally
craft. These maintenance levels, Aviation Unit
small and have less than ten aircraft assigned.
Maintenance (AVUM): Aviation Intermediate Main-
tenance (AVIM) and Depot Maintenance are depicted
Maintenance tasks performed by the aircraft crew
on the MAC as:
chief or assigned aircraft repairman and will
normally be limited to preventive maintenance, in-
O - AVUM
spections, servicing, spot painting, stop drilling,
F - AVIM
application of nonstress patches, minor adjustments,
module/component fault diagnosis and replacement
D - DEPOT
of selected modules/components. Repair functions
b. The maintenance to be performed below depot
will normally be accomplished by the supporting
and in the field is described as follows.
(2) Aviation Intermediate Maintenance (AVIM) -
(1) Aviation Unit Maintenance (AVUM) - AVUM
AVIM provides mobile, responsive "One Stop" main-
activities will be staffed and equipped to perform high
tenance support. (Maintenance functions which are
frequency "On-Equipment maintenance tasks re-
not conducive to sustaining air mobility will be as-
quired to retain or return equipment to a serviceable
signed to depot maintenance.) Performs all main-
condition. The maintenance capability of the AVUM
tenance functions authorized to be done at AVUM.
will be governed by the Maintenance Allocation
Repair of equipment for return to user will emphasize
Chart (MAC) and limited by the amount and com-
support or operational readiness requirements.
plexity of support equipment, facilities required,
Authorized maintenance includes replacement and
and number of spaces and critical skills available.
The range and quantity of authorized spare modules/
repair of modules/components and end items which
components will be consistent with the mobility re-
can be accomplished efficiently with available skills,
quirements dictated by the air mobility concept.
tools, and equipment. Establishes the Direct Ex-
(Assignment of maintenance tasks to divisional
change (DX) program for AVUM units by repairing
company size aviation units will consider the overall
selected items for return to stock when such repairs
maintenance capability of the division, the require-
cannot be accomplished at the AVUM level. Inspects,
ment to conserve personnel and equipment resources
t r o u b l e s h o o t s , tests, diagnoses, repairs, adjusts,
calibrates, and aligns system modules/components.
and air mobility requirements.)
Module/component disassembly and repair will sup-
port the DX program and will normally be limited to
(a) Company Size Aviation Units: Perform
tasks requiring cleaning and the replacement of
those tasks which consist primarily of preventive
seals, fittings and items of common hardware. Un-
maintenance and maintenance repair and replace-
serviceable reparable modules/components and end
ment functions associated with sustaining a high level
items which are beyond the capability of AVIM to
of equipment operational readiness. Perform main-
repair will be evacuated to Depot Maintenance.
tenance inspections and servicing to include daily,
This level will perform special inspections which
intermediate, periodic and special inspections as
exceed AWM capability. Provides quick response
authorized by the MAC or higher headquarters.
maintenance support, on-the-job training, and
Identify the cause of equipment/system malfunctions
technical assistance through the use of mobile main-
using applicable technical manual troubleshooting
tenance contact teams. Maintains authorized opera-
instructions, built-in-test equipment (BITE), in-
tional readiness float. Provides collections and
stalled instruments, or easy to use/interpret
classification services for serviceable/unservice-
diagnostic/fault isolation devices (TMDE). Replace
able material. Operates a cannibalization activity
worn or damaged modules/components which do not
i n accordance with AR 750-50. (The aircraft
require complex adjustments or system alignment
maintenance company within the maintenance bat-
and which can be removed/installed with available
skills, tools and equipment. Perform operational
talion of a division will perform AVIM functions
consistent with air mobility requirements and con-
and continuity checks and make minor repairs.
s e r v a t i o n of personnel and equipment resources.
Perform servicing, functional adjustments, and
Additional intermediate maintenance support will
m i n o r repair/replacement. Evacuate unserviceable