Thank you for using the Bug section, using templates provided will greatly help the team reproducing the issue and ease the process of fixing it.
Are you using Developer Mode or made changes in it?
No
Have you disabled/removed all your mods and addons?
Yes
Which aircraft are you reporting an issue about? (Please also add the proper tag for it)
Boeing 787 Dreamliner
Brief description of the issue:
Pitch becomes uncontrollable or extremely hard to control during flights. Happens every time and only with Boeing aircraft.
Provide Screenshot(s)/video(s) of the issue encountered:
Not allowed to upload
Detailed steps to reproduce the issue encountered:
Start up engines and take off. When I tried to descend to land the airplane would extremely pitch upwards even though Iâm holding the yoke in the fully pitch down position.
PC specs and/or peripheral set up if relevant:
N/A
Build Version # when you first started experiencing this issue:
1.33.8.0
For anyone who wants to contribute on this issue, Click on the button below to use this template:
Do you have the same issue if you follow the OPâs steps to reproduce it?
Provide extra information to complete the original description of the issue:
If relevant, provide additional screenshots/video:
Moved to #gd-commsupport:anc which is more appropriate 
When it next happens, could you note your airspeed, autopilot settings, and flaps/spoilers positions. If youâre able to take a screenshot or photo that would be helpful too.
Here is a link to the video. I always have auto pilot off/disengaged, and I only have auto-trim enabled. https://youtu.be/qZZiHGjN6BA
Are you aware of how airplanes work? Genuine question. You start your video with gear down, flaps at 5 and an airspeed of 370 knots.. I meanâŠ
1 Like
You sure you donât have other assists on?
Pretty sure at that speed youâd be over speeding the gear and flaps (Stress Damage).
Thatâs just an example video. This happens even without the extreme speed etc.
Itâs only an example video. It happens no matter what the airplane speed, flaps config, etc.
Then post a video with your speed within limits. Itâs hard to believe at that point. What I see here is exactly what I would expect: a plane going nuts. Maybe a bit exaggerated but youâre in an area of a weird combination where I doubt that the plane is being correctly simulated anymore. In reality it would simply break.
Additionally your autothrust control is off, your autopilot disconnect bar is down, I donât know what else you did. Depending on how well and extensive the plane has been modelled now you have turned off all kind of aircraft safety and control systems doing that. As I said: fly the plane within limits and we can start to look for the problem(s). Leave the mentioned switches up for a start. Thatâs important.
1 Like
I was in a bit of a hurry before but have the time now to explain it.
The details are basically that the autothrust arm switch isnât there to turn the autothrottle off but itâs a main switch for the whole autothrust system. It includes the safety thrust systems (I donât remember their real names from memory) which prevents the 787 (and 777) to go into over and under speed situations. If you are to overspeed it will reduce the thrust, if youâre about to stall it will throttle up. If you disarm this switch you disable this system and this safety is gone already. Normally you disconnect the autothrust with the thumb button at the side of the thrust levers.
Now the AP disc bar. Iâm not sure anymore about this bar but itâs definitely a hard disconnect. Itâs only used in case the yoke buttons fail. It will be returned to the up position. What Iâm not sure anymore is the level of degration it brings to the fly by wire and flight control system. There is a button or two at the upper left overhead (in the 777, should be similar in the 787) where you could turn off the primary flight computers. Youâd still be able to fly the plane of course but you will turn off further safety measures like the alpha floor protection (pulls up before overspeed, pushes dows to prevent underspeed). It COULD be that the AP disc bar does the same thing if not returned to the norm position. Youâd have to check the FCOM though, usually to be found with an online search.
Doing these things, together with that high airspeed AND addition lift devices set would explain the reaction of your aircraft although it seems obviously a little exaggarated with this 90 deg climb. But have a look at your wing flex, thatâs what the sim calculates here.
1 Like
Okay, thank you. Also when this happens, the dashboard reads â Pitch Up authorityâ. Do you know how to disable it? I donât know if this is just a Boeing thing but this never happens when I use a airbus plane to fly.
Airbus aircraft work entirely different with a very different philosophy behind them. They DO have some quite similar protection systems per certification requirements but their procedures and terminology is very different from Boeing. Iâm absolutely not familiar with Airbus.
For the pitch up authority EICAS messge you should look for an FCOM or QRH, I really donât know it. I ASSUME that it might have to do with the flight protection system being degraded or the aircraft being so out of trim that full control input wonât be enough. But really, I donât know it.
The problem keeps happening, hereâs another video. I just take off and it immediately starts pulling up. When I try to pull back down it barley lets me or just moves down very slowly. https://youtu.be/LclX6zNDrxw
Trim down?
Youâre used to Airbus, they trim themselves⊠This is a Boeing, youâre the pilot, you need to use the trim. Itâs in Takeoff position. I didnât even notice that in the first video since itâs natural to me but you hadnât trimmed your plane there either. Thatâs the whole reason. More lift â Nose comes up. Trim your plane.