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TM 1-1730-223-13&P
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION CONTINUED
NOTE
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).
Disassembly/assembly. The step-by-step taking apart (or breakdown) of a spare/func-
tional group coded item to the level of its least component identified as maintenance
significant (i.e., assigned an SMR code) for the level of maintenance under consideration.
Actions. Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
11. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely service-
able/operational condition as required by maintenance standards in appropriate technical publications.
Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not nor-
mally return an item to like new condition.
12. Rebuild. Those services/actions necessary for the restoration of unserviceable equipment to a like new con-
dition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel main-
tenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age
measurements (e.g., hours/miles) considered in classifying Army equipment/components.
Explanation of Entries in the MAC
Group Number and Component/Assembly. The functional groupings in the sample below identify maintenance sig-
nificant components, assemblies, subassemblies, and modules with the next higher assembly.
Group Number
Component/Assembly Description
04
POWER PLANT
0401
ENGINE, GENERAL Servicing, handling inspection requirements, overhaul
and retirement schedules. External lines and hoses. (As applicable.)
0402
COMPRESSOR SECTION (COLD SECTION MODULE) Rotor, blades,
vanes, impeller, stators, inlet guide vanes, mainframe, particle separa-
tor, bleed valve, bearings, seals, external lines and hoses.
0403
COMBUSTION SECTION (HOT SECTION MODULE) Liners,
nozzles, stators, rotor, seals, couplings, blades.
0404
POWER-TURBINE (POWER TURBINE MODULE) Nozzles,
rotors, blades, exit guide vanes, exhaust frame, drive
shaft, bearings, seals, external lines and hoses.
0405
ACCESSORY GEAR BOX (ACCESSORY SECTION MODULE) Input and
0406
FUEL SYSTEM Fuel control, fuel boost pump, governors, fuel filter assembly,
sequence valve, fuel manifold, fuel nozzle, external lines and hoses.
0407
ELECTRICAL SYSTEM Electrical control units, exciters, thermocou-
ples, ignition harness, electrical cables, history record, torque over
speed sensor, Np sensor, external lines and hoses.
0408
OIL SYSTEM Tanks, oil filter, oil cooler, lube and scavenger
pumps, oil filter bypass sensor, external lines and hoses.
Maintenance Function. Entry lists the functions to be performed on the items listed in Component/Assembly.
Maintenance Level. The maintenance levels field and sustainment are 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,
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