4.8.
SUMMARY
Following the air path through the engine shows how air is
drawn into and moved through the engine's Eve sections. Air brought
into the compressor section is accelerated into the diffuserhousing
air passageway. As the air moves through the passageway, its
velocity changes to pressure and, under pressure, the air enters the
combustion chamber to mix with injected fuel. The flow of the hot
gases across the turbine rotors produces mechanical energy to drive
the compressor and propel the aircraft.
The various models of the T53 include the L13, L13A, L15,
and L701. Some of the specifications differ in each model.
Section II. Major Engine Systems and Assembles
4.9.
GENERAL
Starting at the front of the engine and working rearward we
discuss the major engine assemblies. Systems such as fuel, oil, and
electrical are covered in their entirety, after the major engine
assemblies. Also keep in mind that the T53L13 is a turboshaft
engine, and the T53L701 is a turboprop engine. The turboprop
engine has a propeller reduction gear assembly in the inlet housing
where the turboshaft engine has a smaller output reduction gear
assembly.
4.10.
INLET HOUSING ASSEMBLY
The forward structural support of the engine is provided by
the inlet housing assembly shown in figure 4.5. The outer housing,
supported by six hollow struts, forms the outer wall of the annular
air inlet and houses the antiicing manifold. The inner housing
forms the inner wall of the inlet area.
Enclosed in the inlet housing is the output reduction carrier
and gear assembly, the oil transfer support assembly, and the
accessory drive carrier. A torquemeter valve and cylinder, power
shaft support bearing, and No. 1 main bearing are also mounted
internally. At the rear of the housing the inlet guide vanes are
installed in the airflow path to direct air at the proper angle onto
the first stage of the compressor rotor.
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