Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
7.14.b Engine Operation
Intake air enters the engine through an annular casing and is
then ducted toward compressor. The latter consists of four axial
compressor stages and one single centrifugal stage assembly to
form a whole assembly.
Compressed air is routed around the turbine section by means of
two ducts on both sides of the engine into the combustion
chamber on the rear end of the engine. There fuel is sprayed
into the air by a single fuel nozzle.
The air-fuel mixture is first ignited by a spark igniter plug, then
combustion continues as a result of air-fuel mixture flow. Gases
resulting from combustion expand through a series of turbine
stages.
The two-stage gas producer turbine drives the compressor and
accessory gear train. The following two-stage power turbine
furnishes the output power of the engine. The power turbine
spool is independent from the gas generator spool ("free power
turbine") and drives the propeller shaft through a reduction
gearbox.
The expanded gas discharges in a downward direction through
the twin ducts of the turbine. The subsequent exhaust ducts are
directing the flow backward and discharge into the free stream
on the lower sides of the cowling.
All engine driven accessories, except power turbine tachometer
and propeller governor, are installed on accessory gearbox.
Note The life of the engine is determined by care it receives.
Efficient engine operation and maximum service life
demands careful attention to cleanliness of air and used
fuels and oil. In addition good maintenance and service
executed by qualified maintenance personnel is demanded.
7-26 26. January 2011
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