Today I started a flight with the 777/300. I set an altitude of FL360.

 

Once I was about 1000ft from the TOC the aircraft went above by a 1000, and then tried to correct it self and went below by a 1000.

 

This happened for about 100miles.

 

It then settled down and maintained the FL of 360.

 

Does anyone have any ideas why this happened pls

 

Darren Crosby

Had the same thing with 744X, problem solved by removing the step climb.

Could you be a little more specific about what happened, exactly?

 

Did you set the MCP altitude below the cruise altitude? What do you mean by "above 1000" and "below 1000?" Are you referring to it suddenly climbing and then descending, or that it was above path and below path?

If the plane was climbing then descending repeatedly, it could be caused by an eternal weather program.

climbing and decending over 1000/200 ft. its as if the AP could not maintain FL360.

 

I was running ASN at the time.

 

never had this issue before.

 

Darren

 

 

climbing and decending over 1000/200 ft. its as if the AP could not maintain FL360.

 

Sounds like a hardware trim axis conflict to me. Do you have an elevator axis assigned to your hardware?

 

Also, full names are required in every post. You can configure one in your user settings if you click on your forum name at the top right of the page.

Sounds like a weather problem.  Try disabling weather the next time this happens to troubleshoot.

Ok thanks