MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
MAINTENANCE ALLOCATION CHART. This Maintenance Allocation Chart (MAC) assigns maintenance
functions in accordance with the task levels of specific categories of maintenance in regard to functions on repairable
items and components and the tools and equipment required to perform each function. This appendix may be used as
an aid in planning maintenance operations.
MAINTENANCE FUNCTION. Maintenance functions will be limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination.
b. Test. To verify serviceability and to detect failure by measuring the mechanical or electrical characteristics of an
item and comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(decontaminate), to preserve, to dust, or to paint.
d. Adjust. To maintain, within prescribed limits, by bringing into proper or exact position, or by setting the operating
characteristics to the specified parameters.
Aline. To adjust specified 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 or test measuring
and diagnostic equipment used in precision measurement. Consists of comparisons of two instruments, one of which is a
certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument to be
g. Install. The act of emplacing, seating, or fixing, into position an item, part or module (component or assembly) in
a manner to allow the proper functioning of the equipment or system.
h. Replace. The act of substituting a serviceable like-type part, subassembly, or module (component or assembly)
for an unserviceable counter part.