flyingpilot1740

Strange Managed Speed problem

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I add myself to the list of people affected with this issue!

 

I did some test flights, everything went well. Updated to the latest, now having this twice in my last 5 flights.

 

I did notice that the speed the Airbus managed mode was trying to go was the same speed that was entered in the PROG decent page even if I was still far from the TOD!

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9 hours ago, Draftstone said:

I add myself to the list of people affected with this issue!

 

I did some test flights, everything went well. Updated to the latest, now having this twice in my last 5 flights.

 

I did notice that the speed the Airbus managed mode was trying to go was the same speed that was entered in the PROG decent page even if I was still far from the TOD!

how did you add yourself to the list

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I just want to add those 2 screenshots of the PFD and the PERF page. From what I understand the plane indicates that it is in ALT CRZ and does not want to go to the speed it should go according to the PERF page. When I set it in selected mode, the speed is fine so the autothrottle works fine, but not in managed mode.

 

For this flight I was in cruise for about one hour before it decided to drop speed. For the whole time it had hold the managed speed fine! But suddenly engines went IDLE and dropped speed fast to go to 128 knots even if PERF page shows 0.78 managed speed

 

EDIT: When I started the descent, managed speed went to 230 which is the speed shown in the PERF DES page. So only the CRZ one is broken

managed.png

manual.png

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I"m also experiencing the same issue. I'm noticing climb rates are much slower than normal for the loaded weight. 

 

Once at cruise for some time, the AP will drop the airspeed dramatically and the plane goes into a stall and begins to descend. I'm able to continue if I disable managed speed. 

 

I had also just posted a thread over at FSDT to mention that GSX2 is loading the a320 in a strange way. The loadsheet calls for 180 pax and 6.5mt of cargo. When the GSX vehicles arrive, less than 10 pax board and almost no cargo and bags are loaded. Perhaps this is related?

 

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Dear Aerosoft Team,

 

when will you fix the problem with the speed? You can´t go out of the room for a moment. And selecting speed is not very real :(

 

Best 

Christian

 

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53 minutes ago, Chris1983 said:

And selecting speed is not very real :(

 

Why not? We do it all the time. And I would say that as long as we have this bug it is even realistic to do so if you as a pilot knows this can happen. 

 

Ofcourse the bug should be fixed asap and this is not acceptable in the long run. 

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Hi Frank,

 

sure i select speed during the flight in some situation. But not all times during the flight.

 

Best Chrisitan

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So after being told that everything works prior to the last couple of updates I was told I was suddenly not imputing data into the MCDU correctly. Now a clean install of 4.4 will fix this? Problem started with 4.3. Seems like we are simply having ideas thrown at us instead of solutions. 

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I am sorry you feel that way.  Yet as I said and user djspatrick confirmed this is something we have seen a few times.  I assume you have seen his post only a few posts above you?

 

image.png

 

 

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I seem to be one of the users having this issue, as well as a CTD problem when spawning the CRJ (reported in another thread - Hans has been researching).

 

I think these 2 problems are related, however that may have found itself into my sim. So a reinstall will help I see, I believe it.

Ok, so my Saturday is now planned. 

 

Will report back. 

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I've just did a full re-install due to upgrading to P3D v4.4. I thought I was ok, just did 3 flights where everything was ok, but no, it just happened on the 4th flight as I am cruising at FL350 between CYYZ and KMIA. Managed speed dropped to 120 knots, engines went idle. I am around 45 minutes from TOD, so I had to put speed into Selected mode to continue.

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8 hours ago, Draftstone said:

I've just did a full re-install due to upgrading to P3D v4.4. I thought I was ok, just did 3 flights where everything was ok, but no, it just happened on the 4th flight as I am cruising at FL350 between CYYZ and KMIA. Managed speed dropped to 120 knots, engines went idle. I am around 45 minutes from TOD, so I had to put speed into Selected mode to continue.

v4.4, just happened to me YVR-LAX. Plane stalled out and started dropping... engines appeared to be producing thrust but really weren't doing anything, put it in togalock and it fixed it. Had to take the plane out of managed.

 

Happened when I was coming up on my first altitude/speed restriciton fix.

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It's certainly a bug.
Today - I changed my destination runway around from 36R to 36C  ... just trying to get some fresh data into the flight plan .. and the normal managed speeds came back.

I'll try again when I can re-produce the issue - but if anyone's in mid-flight right now and can try it I'd be curious if it's a good temporary work-around.

 

I'm also curious if those having the problem have been closing the disconnect between the STAR and the final approach fix.

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On 12/9/2018 at 10:09 AM, bob34 said:

It's certainly a bug.
Today - I changed my destination runway around from 36R to 36C  ... just trying to get some fresh data into the flight plan .. and the normal managed speeds came back.

I'll try again when I can re-produce the issue - but if anyone's in mid-flight right now and can try it I'd be curious if it's a good temporary work-around.

 

I'm also curious if those having the problem have been closing the disconnect between the STAR and the final approach fix.

Mine had an open disconnect, it was the IRNMN2 in to LAX which has a downwind then unattached inbound final approach course. And I had this issue.

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Thanks for that report. We do have some other users who report they still see the issue so we are still interested in feedback.

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On ‎12‎/‎9‎/‎2018 at 11:09 AM, bob34 said:

It's certainly a bug.
Today - I changed my destination runway around from 36R to 36C  ... just trying to get some fresh data into the flight plan .. and the normal managed speeds came back.

I'll try again when I can re-produce the issue - but if anyone's in mid-flight right now and can try it I'd be curious if it's a good temporary work-around.

 

I'm also curious if those having the problem have been closing the disconnect between the STAR and the final approach fix.

 

Yes, I always CLR ALL disconnects. 

 

Changing destination runway has worked to restore managed speed after "drops" for me; however, managed speed may drop again.  I've gotten to the point now that for CRZ I will fly in manual mode, until just before TOD; then if the FMC DES PERF page shows a ridiculous speed like 204 kts, I change runway to restore correct managed speed; and set managed speed mode just short of TOD to get the decent managed speed mode.  If you leave the managed descent mode speed at 204 or whatever it drops to, your TOD will be way late and in manual descent you have to keep playing with VS to make waypoint altitude constraints.  May as well be flying the CRJ.

 

Also be aware this issue is reported in the Flight Model/AP/FMS forum.

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