Use of the Maintenance Allocation Chart.

TM 55-4920-425-13-13&P

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 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 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.

c. A maintenance function assigned to a maintenance level will automatically be authorized to be performed at any

higher maintenance level.

d. A maintenance function that cannot be performed at the assigned level of maintenance for any reason may be

evacuated to the next higher maintenance organization. Higher maintenance levels will perform the maintenance

functions of lower maintenance levels when required or directed by the appropriate commander.

e. The assignment of a maintenance function will not be construed as authorization to carry the associated repair

parts in stock. Authority to requisition, stock, or otherwise secure necessary repair parts will be as specified in the repair

parts and special tools list appendix.

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 to 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 the maintenance level to which the function is assigned. This transfer of a maintenance

function to a lower maintenance level does not relieve the higher maintenance level of the responsibility of the function.

The higher level of maintenance will provide technical supervision and inspection of the function being performed at the

lower level.

g. Organizational through depot maintenance of the US Army Electronics Command equipment will be performed

by designated US Army Electronics Command personnel.

h. Changes to the MAC will be based on continuing evaluation and analysis by responsible technical personnel and

on reports received from field activities.

B-3. Definitions.

a. Inspect. To determine serviceability of an item by comparing its physical, mechanical and electrical

characteristics with established standards.

b. Test.

To verify serviceability and detect incipient failure by measuring the mechanical or electrical

characteristics of an item and comparing those characteristics with prescribed standards.

c. Service. To clean, to preserve, to charge, and to add fuel, lubricants, cooling agents and air.

d. Adjust. To rectify to the extent necessary to bring into proper operating range.

e. Align. To adjust specified variable elements of an item to bring to optimum performance.

i. Calibrate. To determine the corrections to be made in the readings of instruments or test equipment used in

precise measurement. Consists of the comparison of two instruments, one of which is a certified standard of known

B-2