Figure 5.5. T55L11 Engine Stations.
5.7.
SUMMARY
Basically, all models of the T55 series engine are of the same
design and principle. The major difference between the L7 and L7C
is that the L7C uses 28 atomizing nozzles instead of the 14
vaporizing tubes in the L7 engine. The T55L11A differs from the
T55L7C in that it has a twostage GP turbine where the L7C has a
singlestage, and of course the shp is different for each model
engine. The engine consists of an air inlet, accessory drive,
compressor, diffuser, and combustion and power turbine sections. The
T55 series engine differs from engines we have previously covered in
that it is a direct drive engine. The Lycoming T55 series engine is
used to power the CH47 Chinook helicopter.
Section II. Major Engine Sections and Systems
5.8.
GENERAL
This section discusses the five major engine sections,
beginning at the front: inlet, compressor, diffuser, combustion, and
power turbine; then it continues with descriptions of various engine
systems, including fuel, lubrication, and electrical systems. The
text and illustrations cover the T55L11A engine except where noted.
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