Following a BSOD today, I reloaded PMDG 777, but was unable to engage LNAV to fly to the next (first) waypoint of the remaining flight plan.

 

A/P and VNAV both showing their green lights, and FL410 being accurately maintained, pressing the LNAV switch would not, even temporarily, show a green light. Steering towards the waypoint worked flawlessly with HDG mode, but still a refusal to engage LNAV . I could manually steer towards the magenta line, but the aircraft would fly over it without altering course (LNAV showed in white on the flight mode annunciations).

 

I then inserted a new waypoint between my current position and the original waypoint, and LNAV engaged with no problem. The aircraft flew to the new waypoint and then on to the original one.

 

Looks like a bug to me, but only further investigations will tell.

 

 

I encountered a similar issue a few days ago.

 

In my case, it occurred after I accidentally set autocruise to 32x and the airplane went completely out of control. When I was able to stablilize it, LNAV was extinguished and nothing I did would bring it back to life. As in your case, it just kept overflying the magenta line while in HDG mode. I resolved the problem by restarting a saved a flight, but it's good to know that the simple addition of a waypoint will clear the issue as well.

Hi both,

Did going direct to the original work? So by that I mean if POL was the next waypoint (next to LSK 1) that you LSK 1, and then LSK 1 again?

Just curious really as I do work a lot with saved flights and do find myself doing that out of habit to make sure I'm going to that waypoint.

Regards

 

 

Did going direct to the original work?

For some reason, it didn't occur to me to try that at the time. I'll be sure to do so, should it happen again.

Hi Carl. I hope that you are well.

 

Good idea to down-select the first waypoint and then up-select it again. I will try that next time.

 

Kind regards, R