Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
which feeds gas producer speed indicator located on engine
instrument panel.
7.14.f Power Turbine – Generator (N
2
)
A power turbine “tacho-generator” is attached to the reduction
gearbox. It supplies a variable frequency voltage, which feeds
propeller speed indicator located on engine instrument panel.
7.14.g Torque Sensor
Prop shaft torque is measured by hydraulically balancing the
Propeller reaction torque in the propeller reduction gear. The
resulting “torque meter pressure” is proportional to the
developed prop shaft torque and is converted into a voltage by
means of a pressure transducer. The output voltage of this
transducer is applied as an input to the torque indicator.
7.14.h Propeller Overspeed Governor
The propeller overspeed governor is installed in the reduction
gearbox. It prevents a propeller overspeed in case of main
propeller governor failure. Propeller overspeed governor is
equipped with a test solenoid, which allows performing ground
tests by momentary pushing the overspeed test button in the
instrument panel activates this solenoid, which is temporarily
lowering the overspeed warning threshold of the overspeed
governor by influencing its internal force balance. This allows
testing its function at Propeller-speeds above about 1600 rpm.
7.14.i Engine Lubrication
1 General
Engine lubrication system is a dry sump type with an external
oil reservoir, a scavenge filter, heat exchanger and oil pump.
2 Heat Exchanger
The heat exchanger (oil-cooler) is airframe mounted and fixed
via its duct outlet to the right side of the non-removable part of
cowling. The air inlet of the oil cooler is a NACA submerged
26. January 2011 7-31
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