Question about trim on final? 777

[z06z33 763]

All the approaches I've made in the 777 have been a struggle. I can't keep the nose down while on final I trim it to where I need it, get it on the GS then the nose starts to rise even when I mantain the same airspeed or slow down. It's like there is a little gremlin in there and when he sees I'm nailed on the GS he decides to hit the up trim. I had to push the yoke most of the way forward to get the plane to respond. It's not a hardware issue as the yoke works great with the NGX ect. Any thoughts?

[Flamin_Squirrel 71]

I've had some strange control issues too, where as the NGX seems fine also. Something else I noticed was the yoke doesn't move in the VC. This makes me wonder if something' not installed quite right?

 

Do you have this same issue? I'll do some more research tonight.

[scandinavian13 5,192]

Auto trim...

 

I've said it a bunch here, but I'll repeat it here:

The 777 is not the 737.  Do not treat it like one or it will bite you.  This is a different bird and as I said before the release, those of you with time in the NGX will probably almost be at a disadvantage because you'll come at it with a sophomoric "oh, I know Boeing" approach.

 

There are a bunch of autotrim threads here in the forum.  There's also one on a.net, which I don't think we can link to here, so I'm using LMGTFY (but not to be a jerk for once - just to allow me to post a link for you):

 

http://lmgtfy.com/?q=777+autotrim

[por930 51]

 

 

so I'm using LMGTFY

LOL......I loved this little shortcut. I have never seen it before. But yes, you are correct, Google is the modern up to date on line encyclopedia about every and any thing that we need to always try before simply asking here.

Regards 

[AirborneZed 168]

I made a post about this. My first landing on the T7 was terrible because I thought it would handle like a big NGX. Boy was I wrong. It is an entirely different plane.

[Flamin_Squirrel 71]

Auto trim...

 

I've said it a bunch here, but I'll repeat it here:

The 777 is not the 737.  Do not treat it like one or it will bite you.  This is a different bird and as I said before the release, those of you with time in the NGX will probably almost be at a disadvantage because you'll come at it with a sophomoric "oh, I know Boeing" approach.

 

There are a bunch of autotrim threads here in the forum.  There's also one on a.net, which I don't think we can link to here, so I'm using LMGTFY (but not to be a jerk for once - just to allow me to post a link for you):

 

http://lmgtfy.com/?q=777+autotrim

 

Ok I've done some more testing. I think there's too much strangeness going on to simply be my own incompetence. I knew about auto-trim, but I'll describe what's happening, just in case.

 

The first thing I tried was to disconnect the primary flight computers to eliminate auto-trim as a variable. Some things I noticed In direct flight mode: the flaperons oscillate at about 2Hz (both on EICAS and external view). Visually, the elevators are frozen in the neutral position (both on EICAS and external view), while pitch control is maintained (in fact, controllability seems better than normal flight mode).

 

Now normal flight mode: when I pull up for example, I see the elevators move up, then return to their previous location. I pull back further, again returning back to the same position. I know auto-trim is active, but this all happens rapidly, before any change in airspeed occurs. This makes pitch control very difficult as the elevators always reset their position.

 

Oh, and the yoke is also frozen (fore/aft, the wheel rotates still) in the VC, in both normal and direct mode. It simply doesn't budge, whatever I do.

 

I know this isn't a 737, but how do you find maintaining an accurate approach, compared to the NGX?

[luscombeguy 4]

I had a similar problem with the NGX using my Saitek yoke. I found that I had the elevator and aileron axis set in both FSX and FSUIPC. Hope that helps.

[Flamin_Squirrel 71]

I had a similar problem with the NGX using my Saitek yoke. I found that I had the elevator and aileron axis set in both FSX and FSUIPC. Hope that helps.

 

A controller issue was my first suspicion too, but It's not that; the NGX flies fine.

[Flamin_Squirrel 71]

Ok, I managed to solve my issue at least. I had my elevators assigned in FSUIPC as a normal FS axis. Apparently while the NGX is happy with this, the 777 doesn't like it.

 

Anywhoo, sending control direct to FSUIPC solved the problem for me.

 

...oh, and now it flies absolutely brilliantly!

[N77022 2]

This helped me understand the very unique FBW system of the 777.

 

http://www.davi.ws/a...book_Cap_11.pdf

 

See 11.8 Control Laws and System Functionality

[icemarkom 59]

I made a post about this. My first landing on the T7 was terrible because I thought it would handle like a big NGX. Boy was I wrong. It is an entirely different plane.

 

That's really funny, as on my first flight (a familiar KSFO-KLAX) that's exactly how I treated it and did full visual (I know Kyle is reading, so I can't use the M-word) landing with no issues. Only then did I go to read the tutorial and did things the right way. I can't wait for the wife and kid to go to sleep tonight to give it another spin :-)

 

It's a fun bird to fly, for sure :-)

[scandinavian13 5,192]

 

 

(I know Kyle is reading, so I can't use the M-word)

 

After reading the FCOM and seeing that Boeing used it, I've since given up 

 

...but yes, I'm always watching  :ph34r:

haha

[kamaz74 81]

Auto trim makes the 777 awkward to control on final... Not sure if it was implemented improperly or if FSX doesn't play nice with auto trim. 

[Flamin_Squirrel 71]

Auto trim makes the 777 awkward to control on final... Not sure if it was implemented improperly or if FSX doesn't play nice with auto trim.

Those were my initial thoughts for a split second; then I remembered this is PMDG we're talking about so of course it's done properly. If you use paid for FSUIPC, make sure you let it handle the control inputs, it doesn't work properly otherwise (at least for me).

[kamaz74 81]

Those were my initial thoughts for a split second; then I remembered this is PMDG we're talking about so of course it's done properly. If you use paid for FSUIPC, make sure you let it handle the control inputs, it doesn't work properly otherwise (at least for me).

 

Make sure you let FSUIPC handle the control inputs?