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Value
Explanation
Acceler.
In this state the turbine is run up to a speed beyond the idle speed. This is
achieved by automatically and progressively increasing the fuel pump
voltage, starting from the initial value.
In this state the yellow "Standby" LED. The red "Pump running" LED lights
up to indicate that the fuel pump is switched on.
Under normal conditions the rotational speed of the turbine should now
continue to rise until it eventually exceeds the programmed idle speed.
Once this is the case, the process moves on to the next state: "Stabilise".
If any of the following error conditions should occur, the Accelerate phase
is halted, and the process moves to the "Slow-down" state:
• The turbine fails to reach and exceed the idle speed within about 40
• The increase in turbine speed is inadequate.
• The measured exhaust gas temperature is too high.
Stabilise
The turbine has accelerated successfully to idle speed, and is now
automatically stabilised at around 35,000 rpm.
As soon as the turbine speed has been stabilised fully at this speed for at
least one second, the process moves to the next state: "Learn LO".
LearnLO
In this state the turbine is automatically stabilised at the idle speed. The
Jet-tronic maintains the turbine at the idle speed until the operator moves
the rpm-slider to idle. Once this has occurred, and the turbine is running at
idle speed, the process moves on to the next state "RUN (reg)".
RUN (reg.)
The turbine is now in normal governor mode, i.e. the operator can set the
rpm of the engine to any level by positioning the rpm-slider accordingly.
In this state the green "OK" LED lights up to indicate that the pilot has
control of rpm.
The control system remains in this state until the turbine is shut down.
SlowDown
This state is confirmed by the green "OK" LED flashing; all the other LEDs
are off; the fuel pump is switched off and the shut-off valve closed.
The system remains in this state until all the following conditions are
fulfilled:
• The turbine speed is below 800 rpm
• The exhaust gas temperature is below 110°C
Once these conditions are met, the process progresses to the "OFF" state.
Manual
The Jet-tronic is in manual mode, which is confirmed by the yellow
"Standby" LED flashing.
The operator quits manual mode by pressing the "Manual" button.
seconds.
Helicopter mechanics
with model turbine engine
60
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