TM 55-1680-317-23&P
(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 to be repairing selected items for return to stock when such repairs cannot be accomplished at
the AVUM level. Inspects, troubleshoots, tests, diagnoses, repairs, adjusts, calibrates, and aligns system
modules/components. Module component disassembly and repair will support the DX program and will
normally be limited to tasks requiring cleaning and the replacement of seals, fittings, and items of common
hardware. Unserviceable reparable modules/components and end items which are beyond the capability of
AVIM to repair will be evacuated to Depot Maintenance. This level will perform special inspections which
exceed AVUM capability. Provides quick response maintenance support, on-the-job training, and technical
assistance through the use of mobile maintenance contact teams. Maintains authorized operational
readiness float. Provides collections and classification services for serviceable/unserviceable material.
Operates a cannibalization activity in accordance with AR 750-50. (The aircraft maintenance company
within the maintenance battalion of a division will perform AVIM functions consistent with air mobility
requirement resources. Additional intermediate maintenance support will be provided by the supporting non-
divisional AVIM unit.)
B-2. USE OF THE MAINTENANCE ALLOCATION CHART
a. The MAC assigns maintenance functions to the lowest level of maintenance based on past experience and the
following considerations:
(1) Skills available.
(2) Time required.
(3) Tools and test equipment required and/or available.
b. Only the lowest level of maintenance authorized to perform a maintenance function is indicated. If the lowest
level of maintenance cannot perform ail tasks of any single maintenance function (e.g. test, repair), then the
higher maintenance level(s) that can accomplish additional tasks will also be indicated.
c. A maintenance function assigned to a maintenance level will automatically be authorized to be performed at any
higher maintenance level.
B-2
