TM 55-2840-254-23
B-4 FUNCTIONAL GROUPS (COLUMNS 1 and 2 )
The functional groupings shown in the sample below identify maintenance significant components,
assemblies, subassemblies, and modules with the next higher assembly.
GROUP
GROUP
NUMBER
DESCRIPTION
DESCRIPTION
NUMBER
FUEL SYSTEM
04
0406
ENGINE GENERAL
Fuel control, fuel boost pump, gover-
0401
nors, fuel filter assembly, sequence
valve, fuel manifold, fuel nozzle,
Servicing, handling, inspection re-
external Iines and hoses.
quirements, lubrication charts,
overhaul and retirement schedules,
External lines & hoses. (As appli-
0407
ELECTRICAL SYSTEM
cable)
Electrical control units, exciters,
COMPRESSOR SECTION
0402
thermocouples, ignition harness,
electrical cables, history record, torque
(COLD SECTION MODULE)
overspeed sensor, Np sensor, alternate
Rotor, blades, vanes, impeller,
stator, blowers.
stators, inlet guide vanes, main
frame, particle separator, bleed
0408
OIL SYSTEM
valve, bearings, seals, external
lines & hoses.
Tanks, oil filter, oil cooler, lube and
scavenge pumps, oil filter bypass
COMBUSTION SECTION
0403
sensor, external lines and hoses.
(HOT SECTION MODULE)
DRIVE SYSTEM
0409
Liners, nozzles, stators, rotor,
Reduction gear assembly, output
seals, couplings, blades.
shaft, seal, bearing.
0404
POWER-TURBINE (POWER
TURBINE MODULE)
0410
MISCELLANEOUS EQUIPMENT
(As applicable)
Nozzles, rotors, blades, exit guide
vanes, exhaust frame, drive shaft,
bearings, seals, external lines and
hoses.
0405
ACCESSORY GEAR SECTION
Input/and output gears, seals,
chip detector, housings, drive
shaft, bearings, and seals.
B-5
