TM 55-4920-394-13&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 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 requirements
and conservation of personnel and equipment 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 consideration:
(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 all 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.
B-2
