I’m aware, the increase in GS combined with the lack of response from the AP is what caused it to overshoot the G/S on the last 400 ft, the question now becomes is this something we can repeat and submit as a bug.
Edit: Need to test a few more configurations, then the unmodded version, but so far this is looking repeatable.
So it looks like the video is a combination of a few things going on based on what I observed in some tests I did. First is that a wind change of 5 kts or more below 500’ AGL will cause the aircraft to initially overshoot/undershoot the glide slope. The other thing that happens is if the wind drops instantly, the aircraft also sees a brief equivalent drop in IAS, and this is where our problem starts.
We’ll use the example where we’ve overshot the glide slope, and you can watch these events unfold in the video by @Neo4316 starting at the 2:12 mark. The headwind drops by about 6 kts as shown by the increase in Ground Speed, you initially see the aircraft briefly reduce power and the descent rate slowly increasing to re-capture the glide slope. Here we run into our first problem, at the lower Vapp speeds used by the A32N in combination with the apparent reduced AP Pitch authority in the last updated, the aircraft is having trouble keeping up with the increased sensitivity of the glide slope at this point. Then at 2:44 the wind drops again, the engines spool up to correct the IAS drop, the IAS immediately stabilizes and the aircraft starts to pitch up to maintain speed while the engines spool back down. At this point there’s nothing left to do but either land long or go around.
As things stand right now the moral of the story is either fly in calm weather, or come off the AP before 400’ AGL until we getter better autoland functions or better low speed pitch authority.
Yep- still not fixed. You have to turn off SEC1 to prevent the death roll and then you lose FBW.
btw, autopilot Related issue is started to fix it!
I have a hunch that if you’d tried correcting either of those touchdowns to the CL with an aileron correction you’d have seen it.
True… but it doesn’t look like I need aileron corrections.
Oh I wasn’t suggesting you needed to correct, but if you had I suspect it would’ve displayed itself. I find that it’ll take a small aileron correction near the ground and it will just keep rolling in that direction even though you correct back the other way twice as much. It’s like it gets confused by ground effect or something.
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