Problems with Power Settings

[jdriskell]

I'm using MSFS2024 and flying the PMDG 777 series.  I control everything with FSUIPC and generally don't have any problems.

Last two flights, one going into KORD and the other going into EHAM, the auto-throttle speed dropped off until a low speed warning occurred. It's been my practice to reduce the levers of my throttle quad to the idle position when the descent starts and allow the auto-throttle to control the power. Each time the speed dropped to about 170K when the system wanted 240-220K. Goosing the throttle levers seems to wake the system up and then the auto-throttle corrects the power and speed. However in the case that occurred at KORD, the auto-throttle got over anxious and caused an over speed condition. This problem seems to occur with the 200ER variant. The F and 300ER variants don't exhibit this behavior.   What could be influencing the aircraft system to ignore the FSUIPC calibrated throttles.

[John Dowson]

17 hours ago, jdriskell said:

What could be influencing the aircraft system to ignore the FSUIPC calibrated hrottles.

Not sure. There have been previous reports of loss of power in PMDG aircraft, but I think these were during climb (and I think for the 737). This issue was identified as being caused by either flaps or spoilers configuration/calibration in FSUIPC, which sometimes doesn't pay well with FSUIPC unless configured correctly. See 

But as this only occurs with one variant,  I doubt this is the issue.

Not sure what to advise. You could maybe try logging the throttle lever position offset, the auto-throttle arm offset and maybe the engine N1/N2 values to see if that reveals anything. You can also attach your FSUIPC7.ini file here and I will check it to see if anything stands out, but I can't think of anything in FSUIPC which would cause such issues.

John