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This is the third video in a series of four videos about the powerplant used by ATR aircraft. It gives a description of the intricate propeller control.
This video is not meant to give a fully detailed description of the system, but to give you an idea about who it works. Despite my effort to be as exact as possible, I might have made mistakes. If you find errors, please let me know, and I will add the corrections here:
1) The drawings show the turbine blades installed in the wrong direction. When viewed from behind, the HP turbine and the power turbine are rotating clockwise, and the LP turbine is rotating counter-clockwise. Here is a video from the engine manufacturer: • PW127XT engine series:...
2) The function of the Secondary Low Pitch Stop Retraction Solenoid is to block the return line from the metering window of the transfer tube. Thus allowing a lower pitch angle (less than 13 degrees) till reverse on the ground. It is operated by a microswitch in the power lever and allows for low pitch when the power lever is behind flight idle.
Links and attributions:
Engine part 1 - General: • ATR systems - Powerpla...
Engine part 2 - Gas turbine: • ATR systems - Powerpla...
Engine part 4 - Procedures: • ATR systems - Powerpla...
Governor: • Model Flyball Governor...
Take-off with “stopped” propeller: • Airplane takes off wit...
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