787 autopilot question - won't respond to speed/altitude changes

I’m new with airliners and autopilot so it’s likely something I’m doing but figured I’d ask. When I first engage autopilot it responds correctly to my changes in attitude and airspeed but after a little while of flying it seems to lock in and no longer respond to changes in the dials. It settles at the original altitude I set, say 36,000 feet but then won’t do anything if I change the altitude. Same for speed. It seems to hit the max speed (before going into the red) and holds it. Changing the airspeed then has no affect. I’ve tried switching between Vnav on/off, tried FLC mode, IAS on/off etc and no difference. What am I doing wrong?

When you change to 36000 did you click the knob again to change it?

Here’s a guide I made a while back on the 787. I hope this helps you.

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I’ve tried clicking the knob and nothing changes. I’ve tried altitude hold on and off, no change. Again, it seems like it gets locked into some program that it won’t let go of. I mean, it seems to be like Skynet doing a nice perfect flight hold pattern yet ignoring any human desire for input change.

Have you checked your settings? Your flight model needs to be set to Modern, and not legacy.
And you have to turn off all assistance settings and set them to Hard/True to life. Also turn off Copilot AI.

Sadly, I’ve done all that. My flight model and settings have been set to as true to life as possible since day one. What I don’t get is how it seems to get locked in and stuck. I mean, for the first 20 minutes or so I can change the airspeed or altitude but there comes a point where it locks in and won’t let me manually make any changes.

Hard to tell what’s wrong.

Is Auto thrust on? Is LNAV on? Is VNAV on?Does it follow your flightplan?

It needs to be set to “modern” and when modern is selected no other options can be changed.

This is a brilliant guide and so easy to use. I love flying the 787 but there were always a couple of things that eluded/annoyed me that you have clarified. Thanks!

It is set to modern, it’s always been set to Modern. I’ll check out Neo’s guide.

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OK, first things first - that guide linked above was fantastic. Everything getting to altitude worked perfectly. The descent however…

First, the speed never holds on descent, and you have to use the spoilers to keep the plane from overspeed. Now, the 777 worked that way in FSX, so it’s not something new to me, and it’s been doing this since release - but the guide doesn’t mention that, so I don’t know if that’s what the guide author is seeing as well.

Second, and this may be related to a recent patch since I haven’t flown the 787 in a bit, it does work like described (except for speed) to get you down to the new altitude given - but, the V/S goes to something like 8K’/minute, and can’t seem to get out of it in time, and always needs to climb back to new altitude (for reference I think the A320 is around 2500 or 3000’/minute).

Thirdly, the managed speed seemed to just stop working, or at least I couldn’t get it turned back on again. I was told to keep it below 280, so as the managed speed was at 310 (? - would think it’d be closer to 285 like the A320), so I intervened and set it to such. But when I got below 10,000’, I tried to turn managed speed back on - and it did nothing. I had to manually use the throttle to get to the speed I wanted - which again, not a huge deal, but not as described so I wanted to make sure I’m not doing something wrong.

At least the ILS landing worked. Wasn’t doing so last time I flew a 787.

Anyway, are these things bugs, or am I doing something wrong?

Also - does the 787 flare/land automatically OK now, or does it still bounce like crazy?

Same here. Tried it again after reading some of that posted guide and same results. Things respond for a little while then just stop responding to manual changes even if I set manual speed intervention or altitude changes.

Autoland hasn’t been implemented (yet) on any MSFS aircraft, but you can do an ‘assisted’ autolands.
https://forums.flightsimulator.com/t/787-final-approach-landing-and-assisted-autoland-guide-1-11-6-0/285976?u=pzl104

I’ve written than guide fairly close to launch date, so it’s using the old version of the 787. I haven’t really flown the 787 these days after the new patch so there might be some discrepancies here and there. I leave that at your own discretion on how you decide to fly.

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