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Loosing speed midflight


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I have actually seen this two times I think.  I believe it is related to MSFS weather.  Both times I was using the sim's live weather and both times I was already at cruise and both times I had a sudden and major shift in wind.  The last time I went from a near 100 knot head wind to a near 100 knot tail wind.  I had issues with the stab trim going whacko for a good 50nm.  Then I was able to regain control at a lower altitude and climb back up to cruise and continue with no issues.  I am convinced that I was in some type of glitchy weather system being injected by MSFS.  I have never seen it using Weather Force and on 99.999% of my flights I don't see it even with sim weather. 

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  • 3 weeks later...

Today I had a problem which may be related to this. I was cruising fine at FL360 at M0.73 and then all of a sudden my speed was M0.55. The autopilot then started to trim up to maintain altitude. Then all of a sudden the speed went back to M0.73. It could be weather but not sure what is going on. Will try to replicate.

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49 minutes ago, John2 said:

Today I had a problem which may be related to this. I was cruising fine at FL360 at M0.73 and then all of a sudden my speed was M0.55. The autopilot then started to trim up to maintain altitude. Then all of a sudden the speed went back to M0.73. It could be weather but not sure what is going on. Will try to replicate.

Another idea, are you using real weather, if so there's an issue with it today where as you climb the OAT rises instead of decreases (reminds me of the FSX bug), although this issue is noticed right from take-off, well for me anyway

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52 minutes ago, EasternT3 said:

Another idea, are you using real weather, if so there's an issue with it today where as you climb the OAT rises instead of decreases (reminds me of the FSX bug), although this issue is noticed right from take-off, well for me anyway

I was using real weather but didn't notice OAT. I will try again...

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But weather is indeed another thing to keep in mind. Only yesterday did I got a 70 mph windshear while cruising along. AIS went from 250 to 320 in a second, of course the aircraft lost all civil behavior at that moment. 

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I did a flight from Montreal to Detroit last night and had this happen 5+ times to me in both directions (immediate drop and gain of speed) at FL320 and then again once during my descent. TheFlyingFabio had this happen a few times on stream yesterday as well. I don't think it's an issue with the aircraft, just crazy winds. I'm not knowledgeable enough about aviation to say if that's a bug in the sim or not, but it made the experience quite unpleasant. Bouncing back and forth between overspeed and way too slow in less than a second isn't fun.

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22 minutes ago, Aplato said:

I did a flight from Montreal to Detroit last night and had this happen 5+ times to me in both directions (immediate drop and gain of speed) at FL320 and then again once during my descent. TheFlyingFabio had this happen a few times on stream yesterday as well. I don't think it's an issue with the aircraft, just crazy winds. I'm not knowledgeable enough about aviation to say if that's a bug in the sim or not, but it made the experience quite unpleasant. Bouncing back and forth between overspeed and way too slow in less than a second isn't fun.

Yes, I think you are right that it something to do with the weather/wind. Asobo haven't quite figured that out yet. Happened to me again. Funny that I haven't yet experienced this with the A320NX which I have flown a lot recently.

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14 minutes ago, John2 said:

Yes, I think you are right that it something to do with the weather/wind. Asobo haven't quite figured that out yet. Happened to me again. Funny that I haven't yet experienced this with the A320NX which I have flown a lot recently.

I only noticed it starting yesterday, and only flown the 320nx yesterday and today and is massively affected, i.e 0 rate of climb/no ability to increase speed, hopefully asobo fixes the issue soon, 

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20 minutes ago, Aplato said:

It seems like it may be temperature rather than wind that is causing this problem for the past day or so: https://forums.flightsimulator.com/t/wrong-temperatures/424391/16

It is, (I've posted on that thread a couple times), it's very similar to a bug that was in FSX, I think although the temp is an issue, there's a wider issue with the weather system as a whole, as I noticed QNHs are off too

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Happened to me today with the 550 on a flight CYUL-CYQM. Cruising at FL390 at M0.76 and then all of a sudden speed is M0.56. No amount of thrust would bring speed back. Going to try the A320nx to see if it happens the same. Very weird. Forgot to look at the OAT. 

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vor 16 Stunden , John2 sagte:

Cruising at FL390

Seems quite high for the CRJ (yeah...I know specs list higher ALT but not loaded and in ideal conditions). I usualy fly default load up to about FL370 which didn't get me any headache so far. FL390 is close to the boundary and a sudden change in anything could lead to a unstable flight.

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1 hour ago, GEK_the_Reaper said:

Seems quite high for the CRJ (yeah...I know specs list higher ALT but not loaded and in ideal conditions). I usualy fly default load up to about FL370 which didn't get me any headache so far. FL390 is close to the boundary and a sudden change in anything could lead to a unstable flight.

You could be right. The autopilot actually stopped at FL370 and I had to VS it up to FL390. Simbrief gave me 39,000 so that's what I used but it could be pushing the envelope.

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