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TM 1-4920-436-13&P
INTRODUCTION CONTINUED
NOTE
The following deinitions 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 identiied as maintenance
signiicant (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 ser-
viceable/operational condition as required by maintenance standards in appropriate technical publica-
tions. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does
not normally return an item to like new condition.
12. Rebuild. Those service/actions necessary for the restoration of unserviceable equipment to a like new
condition in accordance with original manufacturing standards. Rebuild is the highest degree of mate-
rial maintenance 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.
Explanations of Entries in the MAC
Columns (1) - Group Number and (2) Component/Assembly. The functional groupings in the sample below iden-
tify maintenance signiicant components, assemblies, subassemblies, and modules with the next higher assem-
bly.
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 separator, 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 output gears, seals, chip detector, housings, drive shaft, and
bearings.)
0406
FUEL SYSTEM
Fuel control, fuel boost pump, governors, fuel ilter assembly, sequence
valve, fuel manifold, fuel nozzle, external lines, and hoses.
0407
ELECTRICAL SYSTEM
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