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 25 A/T keeps reducing the speed (Read 3988 times)
Raj
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A/T keeps reducing the speed
Aug 6th, 2018 at 4:44pm
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I just upgraded to version 1.2 and noticed that the aircraft is unable to maintain the FMC speed using auto throttle. It slowly keeps reducing the speed.

I am not sure how low the speed gets to, but yesterday I put it on autopilot and left, came back to see it crawling on the ground.  Smiley I am assuming the speeds dropped to the point that the aircraft stalled.

I am currently flying the same route as yesterday and have to turn the A/T off, increase speed manually every 30 min or so. This happens in both VNAV and speed mode.

Anyone else experiencing this?
  
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Richard Nellyer
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Re: A/T keeps reducing the speed
Reply #1 - Aug 7th, 2018 at 12:20pm
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Same issue here. Also the Flex figures seem to be way off and under thrust. Unable to climb at 111800KG and TO-1 w/ flaps 5. AT issue seems to be cured by changing thrust rating to TO/GA however once set to CRZ or CLB the speed falls off again. Will keep testing and add more detail.
  
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CaptainGimp
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Re: A/T keeps reducing the speed
Reply #2 - Aug 8th, 2018 at 8:13pm
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Yes having the same issue since installing updated version.

Doesn't hold FMC speed and even when setting a speed manually it just seems to gradually lose speed until it stalls. I've had to disconnect auto throttle completely.

Strange thing is I did a overnight flight last night and it worked fine!
  
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CaptainGimp
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Re: A/T keeps reducing the speed
Reply #3 - Aug 9th, 2018 at 12:06pm
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Forget my comment about the over night flight, thinking about it I did this before the update. Done another flight today and still have same issue, throttle tails off.
  
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Markoz
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Re: A/T keeps reducing the speed
Reply #4 - Aug 10th, 2018 at 2:23am
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I've just done a test flight (in P3Dv4), and once I reach FL390 (or above), I'm also finding that the speed starts to slowly drop off. I didn't let it get to point of stalling, I just turned the AT off, increased to full power, got back up to M.789, then turned the AT back on. And again it slowly started to lose speed.
  

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CaptainGimp
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Re: A/T keeps reducing the speed
Reply #5 - Aug 10th, 2018 at 11:52am
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Glad its not just me! Annoyingly I deleted the installer for the previous version, was going to revert back until this is resolved but in the rush to clear out old files I removed it Sad
  
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American757
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CS7571.2 PW VNAV Autothrottle
Reply #6 - Aug 9th, 2018 at 6:03pm
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Hello,

Not sure if it has been confirmed as a bug VNAV A/T does not maintain speed when in cruise. It's the same bug that was identified in version 1.0. Just wondering if anyone can confirm this  as bug as well. Thanks

American 757
  
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American757
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Re: CS7571.2 PW VNAV Autothrottle
Reply #7 - Aug 9th, 2018 at 9:55pm
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Tried again.. no way to control A/T at cruise. Please advise. Thanks!!

American757
  
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American757
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Re: CS7571.2 PW VNAV Autothrottle
Reply #8 - Aug 10th, 2018 at 2:42am
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VNAV fails to maintain speed when above FL180. The speed continually falls until it stalls even when a high speed is dialed/selected.
  
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Eric57
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Re: CS7571.2 PW VNAV Autothrottle
Reply #9 - Aug 10th, 2018 at 11:07am
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Hello all,
Same issue for me. I have done 2 flies EDDF/GCTS. After climbing phase, after TOC, the vnav speed drops down. The only way to keep speed is to manage manually the throttle levers. I interrupted the fly saving it with PRO ATC/X. After reloading the fly, authothrottle works well, but when you change anything (vnav speed or altitude), the problem is back. No issue with version 1.10. I will try to reinstall the plane and I will comme back. Regards.
  
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Captain Sim
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Re: A/T keeps reducing the speed
Reply #10 - Aug 10th, 2018 at 1:57pm
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1. Is that PW, RR or both?

2.
- SAVE the scenario - press ; 
- ZIP all 3 files of the saved scenario: 
xxxxx.fxml
xxxxx.cs.config
xxxxx.wx
(located in %USERPROFILE%\Documents\Prepar3D v4 Files\  folder)
- Attach the ZIP archive to your post.

Thanks.
  
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CaptainGimp
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Re: A/T keeps reducing the speed
Reply #11 - Aug 10th, 2018 at 5:42pm
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I only have the PW version so cant comment on RR.

Will recreate and send saved files through
  
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American757
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Re: A/T keeps reducing the speed
Reply #12 - Aug 10th, 2018 at 6:01pm
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Captain Sim wrote on Aug 10th, 2018 at 1:57pm:
1. Is that PW, RR or both?

2.
- SAVE the scenario - press ; 
- ZIP all 3 files of the saved scenario: 
xxxxx.fxml
xxxxx.cs.config
xxxxx.wx
(located in %USERPROFILE%\Documents\Prepar3D v4 Files\  folder)
- Attach the ZIP archive to your post.

Thanks.



1.PW Variant
2. Please see attached file


  

American_757_CS_757_Files_AT_Bug.zip ( 103 KB | 38 Downloads )
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CaptainGimp
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Re: A/T keeps reducing the speed
Reply #13 - Aug 10th, 2018 at 6:27pm
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Files attached
  

757_test.zip ( 26 KB | 33 Downloads )
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Captain Sim
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Re: A/T keeps reducing the speed
Reply #14 - Aug 10th, 2018 at 7:18pm
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Thanks.
Try this, do not to reload the 757 or the scenario with the 757:
- Run the sim
- Select the 757 one single time/no reloads
- Go!
  
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