Version: SU14 XX - 1.35.21.0
Frequency: Consistently
Severity: Low/
Context: In flight, community and developer mode
Bug description: I have created a custom TO/GA switch which triggers AUTO_THROTTLE_TO_GA. The flight director responds, but AUTOPILOT TAKEOFF POWER ACTIVE simvar does not change to 1. This is on custom avionics where the AP and flight director are read but not set by our avionics.
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Hello @SWS-AlexVletsas
First, you have set autothrottle_available to 0 in the AUTOPILOT section of systems.cfg. The TOGA mode requires the autothrottle to be available.
Additionally, Working Title avionics intercepts that AUTO_THROTTLE_TO_GA key event. So the sim will not process it and you want to look at the avionics framework files to see how this event is processed.
Regards,
Sylvain
Hello @FlyingRaccoon ,
I checked against the default Caravan (WT G1000) and King Air (AS3X) and both have autothrottle_available =0, but TOGA works there.
An interesting detail is that TOGA works when using the PMS and TDS GTN750, but these 3rd party units may be explicitly setting the flight director to the TOGA pitch. Take this with a pinch of salt.
Alex
Hello @SWS-AlexVletsas
The AUTO_THROTTLE_TO_GA key event does 2 things:
- Set the A/T to TOGA mode
- Set the autopilot pitch reference to what’s configured with pitch_takeoff_ga
So if you have no A/T, it will just change the AP target pitch.
That’s what happens with the King Air but then, you will notice the AUTOPILOT TAKEOFF POWER ACTIVE simvar also stays to 0 in that case.
Regards,
Sylvain
Correct, but the FD does not move when I do that. 
It does in the King Air.
The base autopilot updates both AUTOPILOT FLIGHT DIRECTOR PITCH and AUTOPILOT FLIGHT DIRECTOR PITCH EX1 simvars in this case.
But once again, I can’t give any guarantee if the avionics your aircraft is based on intercepts AUTO_THROTTLE_TO_GA to implement its own logic.
Regards,
Sylvain