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 associated RPSTL.
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 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 defined as follows:
1. 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).
2. Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical characteristics
of an item and comparing those characteristics with prescribed standards.
3. 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 fluids, or gases.
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by
setting the operating characteristics to specified parameters.
5. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
6. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test,
measuring, and diagnostic equipments 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.
7. Remove/Install. To remove and install the same item when required to perform service or other
maintenance functions. Install may be the act of emplacing, 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
8. 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.
9. Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, disassembly/assembly procedures, and maintenance actions to identify troubles 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" maintenance function:
Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting - The process of investigating and detecting the
cause of equipment malfunctioning; the act of isolating a fault within a system or
Unit Under Test (UUT).