MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION CONTINUED
A maintenance function that cannot be performed at the assigned level of maintenance for any reason may be
evacuated to the next higher maintenance level. Higher maintenance levels will perform the maintenance func-
tions of lower maintenance levels when required by the commander who has the authority to direct such tasking.
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 specied
in the associated PSTL.
Normally there will be no deviation from the assigned level of maintenance. In cases of operational necessity, at
the request of a lower maintenance level and on a one-time basis, transfer of maintenance functions to the lower
level may be accomplished by specic authorization of the maintenance ofcer of the higher 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 trans-
fer of a maintenance function to a lower maintenance level does not relieve the higher maintenance level of the
responsibility for the function. The higher level of maintenance will provide technical supervision and inspection
of the function being performed at the lower level.
Maintenance functions will be limited to and dened as follows:
Inspect. To determine the serviceability of an item by comparing its physical, mechanical and/or elec-
trical characteristics with established standards through examination (e.g., by sight, sound, or feel).
Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic or electrical character-
istics of an item and comparing those characteristics with prescribed standards.
Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical uids, or gases.
Unpack. To remove from packing box for service when required for the performance of mainte-
Repack. To return item to packing box after service and other maintenance operations.
Touch up. To spot paint scratched or blistered surfaces.
Mark. To restore obliterated identication.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position or by
setting the operating characteristics to specied parameters.
Align. To adjust specied variable elements of an item to bring about optimum or desired performance.
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, mea-
suring and diagnostic equipment used in precision measurement. Consists of comparisons of two in-
struments, one of which is a certied standard of known accuracy, to detect and adjust any discrepancy
in the accuracy of the instrument being compared.
Remove/Install. To remove and install the same item when required to perform service or other mainte-
nance functions. Install may be the act of emplacing, seating or xing into position a spare, repair part
or module (component or assembly) in a manner to allow the proper functioning of an equipment or sys-
Paint. To prepare and spray color coats of paint so that the ammunition can be identied and protected.
The color indicating primary use is applied, preferably, to the entire exterior surface as the background
color of the item. Other markings are to be painted as original so as to retain proper ammunition iden-
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace"
is authorized by the MAC and assigned maintenance level is shown as the third position code of the
Source, Maintenance and Recoverability (SMR) code.