e. Repair. The application of maintenance services including fault isolation/troubleshooting, removal/installation,
and disassembly/assembly procedures, 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
Services - Inspect, service, and/or replace
Fault location/troubleshooting - the process of investigating
and detecting the cause of equipment malfunctioning.
Disassembly/assembly - the step-by-step taking apart (or
breakdown) of a spare/functional group coded item to the
level of its least component that is assigned an SMR code
for the level of maintenance under consideration.
Explanation of Columns in the MAC
Column (1) - Group Number. Column (1) lists functional group code numbers, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.
Column (2) - Component/Assembly. Column (2) contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column (3) - Maintenance Function. Column (3) lists functions to be performed on item listed in Column (2). (For
detailed explanation of these functions, refer to Maintenance Functions outlined above.)
Column (4) - Maintenance Level. Column (4) specifies each level of maintenance authorized to perform each
function listed in Column (3), by indicating work time required (expressed as hours in whole hours or decimals) in
the appropriate sub-column. This work time figure represents the active time required to perform that maintenance
function at the indicated level of maintenance. If the number or complexities of the tasks within the listed
maintenance function vary at different maintenance levels, appropriate work-time figures are to be shown for each
level. The work-time figure represents the average time required to restore an item (assembly, sub assembly,
component, module, end item, or system) to a serviceable condition under typical field operating conditions. This
time includes preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location
time, and quality assurance time in addition to the time required to perform the specific tasks identified for the
maintenance functions authorized in the maintenance allocation chart.
a. C- Crew or operator maintenance done within organization or aviation unit maintenance
b. O - Aviation Unit Maintenance
c. F - Aviation Intermediate Maintenance
d. H - General support maintenance
e. L - Specialized repair activity
f. D - Depot Maintenance
Column (5) - Tools. Column (5) specifies the tool required to perform the designated function.
Column (6) Remarks