weixin_39870155
weixin_39870155
2020-12-02 22:57

[BUG] A320 Still sometimes sharp banks or rolls to the left before touchdown

Mod Version

Latest master

Describe the bug

When coming down to land at some airports and sometimes just randomly when around 10ft, the aircraft will perform a sudden roll to the left or right, striking the wing into the ground. This is randomly triggered and I am not sure what causes it, but me and 3 friends all have had the issue.

To Reproduce

  1. Spawn in the Rio approach in landing challenges
  2. Try and land
  3. At around 10ft there is a 50% chance or so of rolling to the left

Expected behavior

The aircraft can land

Actual behavior

It banks the wing into the ground

References

Additional context

Was this working before/when did the issue start occurring? Since the second asobo update

Is this a problem in the vanilla unmodded game? Yes

Discord username (if different from GitHub): obama#6262

该提问来源于开源项目:flybywiresim/a32nx

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24条回答

  • weixin_39522927 weixin_39522927 5月前

    This is actually a duplicate of #974 - let's continue there.

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  • weixin_40001275 weixin_40001275 5月前

    Did you change Vapp in the FMS to any other than the computed value? It shows this behaviour when it deems the approach speed too low - although the computed values for Vapp and VLS are too high compared to the real aircraft. Also you may want to stay in Managed Airspeed mode, as switching to Selected Airspeed may cause the same behaviour, even when flying at the computed approach speed.

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  • weixin_39803207 weixin_39803207 5月前

    This issue was solved for another person by them adjusting their roll sensitivity and deadzone in game. The issue was the spoilers were actuating with nearly every input of roll causing the aircraft to roll heavily on final approach before touch down. He thought it was a wind shear before touchdown every time. Pay attention to your flight control page and watch the up arrows on the wing spoilers to indicate they're deployed/retracted as you make your landing. If it looks too touchy, adjust that deadzone/sensitivity and retry until you find a setting that is comfortable.

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  • weixin_39870155 weixin_39870155 5月前

    Did you change Vapp in the FMS to any other than the computed value? It shows this behaviour when it deems the approach speed too low - although the computed values for Vapp and VLS are too high compared to the real aircraft. Also you may want to stay in Managed Airspeed mode, as switching to Selected Airspeed may cause the same behaviour, even when flying at the computed approach speed.

    Yeah I was on selected speed mode at 145kts on this landing, I'll try a higher landing speed next time. What speed would you normally land at?

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  • weixin_39870155 weixin_39870155 5月前

    Just tried landing the A320 with no wind at 155kts, still rolls sharply. Starting to make this plane unflyable if it's not possible to land

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  • weixin_39928844 weixin_39928844 5月前

    I would like to add, that in my case, I switch OFF the AP at 100Ft; the plane flies steady onto ground and just upon touch down, it turns heavily left. Flaps FULL and calculated VLS from MCDU. Dead zones in flight controls applied.

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  • weixin_39763953 weixin_39763953 5月前

    same here

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  • weixin_39758618 weixin_39758618 5月前

    Same issue here. I noticed that if I begin and hold the flare at about 20-30ft, and then climb to 60-70ft, roll authority is restored. Perhaps it is something to do with a "ground effect" triggering a bug or something?

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  • weixin_39928844 weixin_39928844 5月前

    From my own experiments, I'm coming also more and more to the conclusion that the flair/ground effect aerodynamic model is flawed. It comes intensified w/ real weather wind (changes). I remember that in V 1.7 they'd endless flairs and I think they changed this in 1.8 probably to the other extreme.

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  • weixin_39865102 weixin_39865102 5月前

    1 out of my 3-4 flights i get this sudden roll behavior and i always get the heavy landing feeling in any landing speed i have tried....

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  • weixin_39602637 weixin_39602637 5月前

    Have you guys seen these posts? https://forums.flightsimulator.com/t/a320-rolls-left-on-retard-and-flare/190230/211?u=awareplot117729

    Is he in the Flybywiresim program? His posts seem to posit that it is a FBW tuning mode issue that would not necessarily be fully solved by changing aero parameters or increasing speed.

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  • weixin_40001275 weixin_40001275 5月前

    Have you guys seen these posts? https://forums.flightsimulator.com/t/a320-rolls-left-on-retard-and-flare/190230/211?u=awareplot117729

    Well, yeah, so things are pretty much working as intended from Asobo's standpoint. The aircraft does switch into Direct Law once it enters the Flare phase and/or is on the ground. So their implementation is insofar correct as it tries to emulate this behaviour despite the vanilla A320 not modelling the different flight control laws.

    I remember asking around in the Discord a couple of days ago whether anyone found a way to switch off automatic elevator trim during the flight. This is also something that the real aircraft does at exactly the same 50/100 ft radar altitudes the linked forum post describes.

    For reference, see http://www.a320dp.com/A320_DP/flight-controls/sys-7.3.9.html

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  • weixin_39928844 weixin_39928844 5月前

    I see a lot of focus on the plane controls & AP, but what about the aerodynamic model and Ground Effect/Winds? Ground Effect should help the plane flairing, but since it flaires like a brick, there must be something...

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  • weixin_39615984 weixin_39615984 5月前

    I see a lot of focus on the plane controls & AP, but what about the aerodynamic model and Ground Effect/Winds? Ground Effect should help the plane flairing, but since it flaires like a brick, there must be something...

    After this last update it looks like a meteorite hitting the asphalt and rolling so that it is everywhere except towards the center of the track.

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  • weixin_39928844 weixin_39928844 5月前

    After this last update... hitting the asphalt

    I don't want repeating myself too much, but 4me the significant change occured already from MS V 1.7.14 (1st release) where plane were flairing forever, and 1.8.3

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  • weixin_39966130 weixin_39966130 5月前

    I see a lot of focus on the plane controls & AP, but what about the aerodynamic model and Ground Effect/Winds? Ground Effect should help the plane flairing, but since it flaires like a brick, there must be something...

    check the PRs, there are several improvements in the final stage

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  • weixin_39870155 weixin_39870155 5月前

    I see a lot of focus on the plane controls & AP, but what about the aerodynamic model and Ground Effect/Winds? Ground Effect should help the plane flairing, but since it flaires like a brick, there must be something...

    check the PRs, there are several improvements in the final stage

    yeah, hopefully #1295 should help fix or alleviate the issue

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  • weixin_39966130 weixin_39966130 5月前

    I see a lot of focus on the plane controls & AP, but what about the aerodynamic model and Ground Effect/Winds? Ground Effect should help the plane flairing, but since it flaires like a brick, there must be something...

    check the PRs, there are several improvements in the final stage

    yeah, hopefully #1295 should help fix or alleviate the issue

    Yeah i have been testing it in the last few days and had almost zero issues while landing

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  • weixin_39822184 weixin_39822184 5月前

    For me my rudder sensitivity/deadzone needed some tweaking because it sometimes had "phantom" inputs which were tiny but somehow caused the plane to dip. (Same for joystick z axis)

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  • weixin_39571403 weixin_39571403 5月前

    I still observe this issue, albiet it has been reduced slightly. But for example, landing challenge at Paro, the left bank required into the landing zone, at the crucial 80 - 50ft height the bank is 'locked' in place and right alerion input seems ignored for a second or 2, around 40 or 30 ft, it responds and there is an over correction tendancy. Gilbrator landing challenge was better as was more wings-level over the keys but the feeling of less to none alerion response is there. It still better than the default behaviour but unfortuntely still there in how I described in those situations.

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  • weixin_39665379 weixin_39665379 5月前

    Is it correct that this issue should be closed now considering #1295 not entirely solves the issue?

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  • weixin_39785970 weixin_39785970 5月前

    I’m agree with henrikx #1295 not entirely solves the issue !

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  • weixin_39542608 weixin_39542608 5月前

    Still a big problem for me as this kind of abnormal rolling/banking effect makes hand fly landing quite difficult to pull off. Almost everytime when I'm close to the runway like 30-50ft above it, the aileron just didn't react and keep rolling/banking to either directions. This particularly affect my crosswind or windy day landing as i will have to constantly correct the attitude of my plane during approach until the moment before touch down. Any slight correction above the runway will results in big roll or bank. Unless you have lined with the runway perfectly, if you are still doing correction above the runway Like 30-50ft then this issue will occurs.

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  • weixin_39522927 weixin_39522927 5月前

    that PR should not have closed this issue. I merged it, so it says I closed it but it was done automatically by GitHub due to erroneous content of the PR description. Sorry for this inconvenience.

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