TM 55-1680-320-23 & P
may perform all maintenance functions authorized to be done at AVUM. Repair of equipment for return to user will
emphasize support or operational readiness requipments. Authorized maintenance includes replacement and repair of modules
/ components and end items which can be accomplished efficiently with available skills, tools and equipment. AVIM
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. The AVIM level inspects, troubleshoots, performs diagnostic tests,
repairs, adjusts, calibrates and aligns aimcraft system modules / components. AVIM units will have capability to determine
the serviceability of specified modules/ components removed prior to the expiration of the Time Between Overhaul (TBO)
or finite life. 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. Air frame repair and
fabrication of parts will be limits to those maintenance tasks which can be performed with available tools and test equipment.
Unserviceable repairable modules / components and end items which are beyond the capability of AVIM to repair will be
evacuated to Depot Maintenance. AVIM will perform aircraft weight and balance inspections and other special inspection
which exceed AVUM capability. Provides quick response maintenance support, including aircraft recovery and air evacuation,
on-the-job training and technical assistance through the use of mobile maintenance contact teams. Maintains authorized
operational readiness float aircraft. Provides collection 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
B-2. Use of the Maintenance Allocation Chart (Section II)
Nomenclature used throughout the MAC are approved item names. Those terms / nomenclatures expressed
in parentheses are generic in nature and are not to be considered as official terminology.
a. The Maintenance Allocation Chart assigns maintenance functions based on past experience and the following con-
(1) Skills available.
(2) Work time Required.
(3) Tools and test equipment required and / or available.
b. The assigned levels of maintenance authorized to perform a maintenance function are indicated.
c. A maintenance function assigned to a maintenance category will automatically be authorized to be performed at
any higher maintenance category.
d. A maintenance function that cannot be performed at the assigned category of maintenance for any reason may be
evacuated to the next higher maintenance category. Higher maintenance categories will perform the maintenance functions
of lower maintenance categories when required or directed by the commander that has the authority to direct such tasking.
e.The assignment of a maintenance function will not be construed as authorization to carry the related repair parts
or spares in stock. Information to requisition or otherwise secure the necessary repair parts will be as specified in the
associated Repair Parts and Special Tools List (RPSTL).
f. Normally there will be no deviation from the assigned level of maintenance. In cases of operational necessity,
maintenance functions assigned to a maintenance level may, on a one-time basis and at the request of the lower maintenance
level, be specifically authorized by the maintenance officer of the level of maintenance to which the function is assigned,
The special tools, equipment, etc. required by the lower level of maintenance to perform this function will be furnished by