Need to flatten this edge

[rcruss]

Hi all,

I am trying to flatten this edge to the origin.  I have everything selected but as you can see in the screenshot, the OK button on the dialog is greyed out.  All three points are very close to the origin and I've made sure that all of the points are on the same side.  I just want them to snap to the centerline.  

Any help is greatly appreciated.

[rcruss]

Here is the project if needed.

http://a360.co/2DjLFpM

[davebYYPCU]

Select the trailing edge, then flatten, select to plane in the options, and then the plane, 

worked for me.

Might help...

[rcruss]

Thanks dave.  Not exactly sure what you mean by the trailing edge.  There are two edges that need to be flattened.  I selected both of them and then clicked Flatten.  This selected the three vertices shown in the screenshot.  In the screenshot I have also selected the plane, but the dialog has the OK button greyed out so I can't finish the operation.  I've only been using Fusion for a couple of weeks.  Probably just some noob thing, but I can't figure out what I'm doing wrong.

Thanks again.

[laughingcreek · Accepted solution]

For what ever reason, flatten doesn't work on just 3 points.  The command needs 4 or more. 

[rcruss]

That was it!  Thanks!  Good to know.

[davebYYPCU]

I was referring to the Trailing edge of Cockpit 2 / Body1, which was activated when file opened, 

Just under the rudder trailing edge, there were three faces, four points, and they looked like the area you mentioned for 3 points, 

might not be what your referred to, but I got that edge to flatten and align to the origin plane, where it wasn't aligned or flat when the file was opened.

pic might help, but selection was for Edge not Vertices.

Might help.....