MAINTENANCE ALLOCATION CHART
Section I - INTRODUCTION
General. This Maintenance Allocation Chart (MAC) designates responsibility for performance of maintenance
functions to specific maintenance categories.
Maintenance Functions. Maintenance functions are as follows:
Inspect: To determine the serviceability of an item by comparing its physical, mechanical or electrical
characteristics with established standards through examination.
Test: To verify serviceability and detect incipient failures by measuring the mechanical and/or electrical
characteristics 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
(decontaminate), to preserve, to drain, to paint or to replenish fuel, lubricants, hydraulic fluids or compressed air (gas)
Adjust: To maintain, within prescribed limits, by bringing into proper or exact position or by setting the
operating characteristics to specified parameters.
Align: 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,
measurement 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 being compared.
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 an equipment or system.
Replace: The act of substituting a serviceable like type part, sub-assembly or module (component or
assembly) for an unserviceable counterpart.
Repair: The application of maintenance services or other maintenance actions to restore serviceability to an
item by correcting specific damage, fault, malfunction or failure in a part, subassembly, module (component or assembly),
end item or system.