A maintenance function assigned to a maintenance level will automatically be authorized to be performed at any
higher maintenance level.
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 functions 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 specified in the
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 specific authorization of the maintenance officer 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 transfer of a maintenance
function to a lower maintenance level does not relieve the higher 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
Maintenance functions are limited to and defined as follows:
Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or
electrical 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
characteristics of an item and comparing those characteristics with prescribed standards.
Service. Operations required periodically to keep an item in proper operating condition; e.g., to clean
(includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, lubricants,
chemical fluids, or gases.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper 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 of 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 being compared.
Remove/Install. To remove and install the same item when required to perform service or other
maintenance functions. Install may be the act of placing, seating, or fixing into position a spare, repair
part, or module (component or assembly) in a manner to allow the proper functioning of an equipment or
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and the assigned maintenance level is shown as the third position code of the
Source, Maintenance and Recovery (SMR) code.
Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, and disassembly/assembly procedures, and maintenance actions to identify trouble
and 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.
The following definitions are applicable to the repair
ServicesInspect, test, service, adjust, align, calibrate,