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ATS Remains Engaged in flight with one N1 fan rotor locked (incorrect; > 13% N1 split)


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Posted (edited)

I was playing with failures and locked the left N1 fan.  As you can see from the screenshot, left N1 is zero and right N1 is around 80.  According to the AFM, an N1 split > 13% will cause the ATS to disengage with a DISENG'D message in the MSD.  In this case, the ATS seamlessly increased thrust on the right engine apparently to compensate for the loss of thrust from the left engine.  ATS should have disengaged. Interestingly, when I restored N1 rotation (cleared the failure), the ATS disengaged with a FAIL, rather than DISENG'D in the MSD.

I also tried locking N2 and as expected the whole engine failed and ATS disengaged with a FAIL.  I'm not sure if it's supposed to show FAIL or DISENG'D in the MSD in that case.

Also, I used the mouse to grab one power lever and reduced thrust until the split was > 13%:  ATS disengaged, but with a FAIL message, rather than DISENG'D as per the AFM.

Also, I'm sneaking this in since it's right there in the screenshot.  The L WINDOW HEAT CAS message is on:  This stayed on after shorting the left window and then clearing that failure (before all my N1 shenanigans). I had to cycle the switches off and on again to clear the CAS message after clearing the failure.  Same with the hydraulic B pump shorts that I tried.  After pressing "Clear All Triggered", I still had to cycle the respective switches to restore function to the pumps.  Is this intentional?

BTW, the simulator is running, aircraft is cruising as I write this, and even though I cleared all failures and cycled the window/windshied heat switch and cleared the L WINDOW HEAT CAS message some minutes ago, that same CAS message just came on again for no reason I can understand.  Switches are in LOW, there are no failures, and I haven't touched anything.  is there some persistent damage that was caused by the short I induced?

All the above was accomplished during one segment/session in non-persistent mode.

Encablulator from Discord

AFM ATS Disengage.png

ATS Engaged with big N1 split.jpg

Edited by mesae
  • mesae changed the title to ATS Remains Engaged in flight with one N1 fan rotor locked (incorrect; > 13% N1 split)

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