Explanation of Entries in the MAC
Columns (1) Group Number and (2) Component/Assembly. The functional groupings in the sample below
identify maintenance significant components, assemblies, subassemblies, and modules with the next higher
Servicing, handling inspection requirements, overhaul and retirement schedules. External lines
and hoses. (As applicable)
Rotor, blades, vanes, impeller, stators, inlet guide vanes, mainframe, particle separator, bleed
valve, bearings, seals, external lines and hoses.
Liners, nozzles, stators, rotor, seals, couplings, blades.
Nozzles, rotors, blades, exit guide vanes, exhaust frame, drive shaft, bearings, seals, external
lines and hoses.
ACCESSORY GEAR BOX (ACCESSORY SECTION MODULE)
Input and output gears, seals, chip detector, housings, drive shaft, and bearings.
Fuel control, fuel boost pump, governors, fuel filter assembly, sequence valve, fuel manifold,
fuel nozzle, external lines and hoses.
Electrical control units, exciters, thermocouples, ignition harness, electrical cables, history
record, torque over speed sensor, Np sensor, external lines, and hoses.
Tanks, oil filter, oil cooler, lube and scavenger pumps, oil filter bypass sensor, external lines
Column (3) Maintenance Function. Column (3) list the functions to be performed on the items listed in
Column (4) Maintenance level. The maintenance levels field and sustainment a listed on the MAC with
individual columns for AMC, ASB, TASMG, and Depot that include the work times for maintenance functions at
each maintenance level. Work time presentations such as "0.1" indicate the average time (expressed in manhours
in whole hours or decimals) it requires a maintenance level to perform a specified maintenance function. If a work
time has not been established, the columnar presentation will indicate "- -". Maintenance levels higher than the
level of maintenance indicated are authorized to perform the indicated function.
Column (5) Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool sets (not
individual tools), common TMDE, and special tools, special TMDE, and special support equipment required to
perform the designated function.
Column (6) Remarks Code. When applicable, this column contains a letter code, in alphabetical order, which is
keyed to the remarks.