Hi

 

I need some help with the 737NGX autothrottle logic for building a motorised throttle quadrant.

 

Could someone tell me how I could determine when the plane commands the autothrottles to on and when they're commanded to off again throughout all the flight modes?

 

I need to power up my servos only when the plane is commanding the throttles and then remove power again when the AT disengages, for whatever reason. I just need to be able to determine when this is happening. Initially I can check for the TOGA button "press", but after this I still need to know when the AT disengages.

 

I'm currently using FSUIPC to read the throttle positions from FSX as well as the 737NGX specific offsets for AT Arm and FD switches etc.

 

Any help would be greatly appreciated.

 

Regards

I think you can move throttle levers only in ARM and THR HOLD modes, maybe you can use SDK to read what AT mode is active and disengage your motors when one of these are active.

You can set throotles to overpower servos always or only in arm/hold modes. The former is useful if you have throttle with servos, and the later to perform rto-s

Hi, thanks for the info.

 

I had a look at the available offsets in the SDK, but there are no offsets indicating the state of the different modes... i.e. ARM, THR HOLD, FMA thrust mode etc.

 

According to TUTORIAL #1, Page 0.00.70, the following will happen when reaching the T/D point: "The FMA thrust mode annunciates RETARD while the throttles are being moved back to idle, followed by ARM in white, which indicates that the autothrottle servo is disconnected from the physical throttles."

 

Is there a way to infer these modes from the available offsets, or would this mean that PMDG will have to add extra values to the SDK to indicate the different "modes" of the plane? Anyone from PMDG willing to comment on this and whether it might be something you'll consider adding?

 

Thanks.