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TM 1-4920-924-13&P
AVIATION SHOP EQUIPMENT CONTACT MAINTENANCE (AV SECM) SYSTEM MAINTENANCE ALLOCATION
CHART (MAC) INTRODUCTION - (CONTINUED)
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 speciic authorization of the maintenance oficer 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
Maintenance functions will be limited to and deined 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 luids, or gases.
a. Unpack. To remove from packing box for service when required for the performance of maintenance
operations.
b. Repack. To return item to packing box after service and other maintenance operations.
c. Clean. To rid the item of contamination.
d. Touch up. To spot paint scratched or blistered surfaces.
e. Mark. To restore obliterated identiication.
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by
setting the operating characteristics to speciied parameters.
5. Align. To adjust speciied variable elements of an item to bring about optimum or desired performance.Align.
To adjust speciied 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 equipment used in precision measurement. Consists of comparisons of two
instruments, one of which is a certiied 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 ixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
8. Paint (ammunition only). To prepare and spray color coats of paint so that the ammunition can be identiied
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 identiication.
9. 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.
10. 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 speciic damage, fault, malfunction, or failure in a part,
subassembly, module (component or assembly), end item, or system.
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