Hello,My problem is that the plane won't follow the course, like it is programmed on the fmc. vnav and lnav are armed just before takeoff, and the a/t is also armed.at about 2500 ft, i engaged the autopilot.Now when i moved my joystick the autopilot goes out, i try to re-engaged it, but i have to fly manual the right course and alt. What could be the problem?thanks,candlebe

>Hello,>>My problem is that the plane won't follow the course, like it>is programmed on the fmc. vnav and lnav are armed just before>takeoff, and the a/t is also armed.>at about 2500 ft, i engaged the autopilot.Now when i moved my>joystick the autopilot goes out, i try to re-engaged it, but i>have to fly manual the right course and alt. What could be the>problem?>>thanks,>candlebe Moving the joystick or yoke will disengage the A/P. This is by design. Once you engate the A/P, you need to use the MCP to adjust course/altitude, etc...- John

>Now when i moved my>joystick the autopilot goes out, i try to re-engaged it, but i>have to fly manual the right course and alt. What could be the>problem?Its supposed to do that. What you need to do is use the HDG SEL function on the MCP. Select a heading that will intercept the magenta line, then arm LNAV again. When you aircraft gets within something like 2 miles (I think) of the correct course, LNAV takes over.