Figure 4.36.
Exhaust Thermo
couple Harness.
The thermocouples are
inserted through the exhaust
diffuser into the exhaust gas
flow. When heated by the exhaust
gas, an electromotive force(emf)
is generated. Any two dissimilar
metals placed in contact with
each other generate a small
voltage if heated at that
junction. The amount of voltage
produced varies with the metals
used and the temperature they are
heated to. Electrically, the
thermocouples are connected in
parallel with each other. This
results in an average temperature
reading. If one thermocouple
becomes inoperative an average reading of the remaining ones will
result. The thermocouples and their leads are made of chromel and
alumel. Chromel is an alloy of nickel and chromium. Alumel is an
alloy of nickel, manganese, aluminum, and silicon. The accuracy of
the thermocouple harness is +5 at 1292 F (700 C).
4.23.
SUMMARY
The major engine assemblies are the inlet, accessory gearbox,
compressor, diffuser, and combustor turbine assembly. The inlet
housings on both the T53L15 and T53L701 have a propeller
reduction gear assembly.
Fuel is metered by a hydromechanical fuel control to twenty
two atomizers. The fuel control has two modes of operation: normal,
and manual fuel flow. The internal cooling and pressurization system
provides cooling air to internal engine parts and pressurizes the
main bearing seals. The engine has variable inlet guide vanes to
ensure a
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