Hi there,

 

following the tutorial#2 fuel calculation example - the part relative to the alternate trip fuel, some time when I try do switch the alternate from the default "direct" to the "missed" mode the LSK seems not to work, direct is there and cannot be changed to missed. Deleting the airport and reinseting it or trying with others airports doesn't "unlock" the mode switch.

 

I guess is my problem since some times it works, some times it doesn't but haven't been able to figure out what I was making different... PERF INIT is always done, i tryed to make sure a DEP rwy/sid was selected as well as TO INIT but no luck...

 

Hope somebody can help!

I had similar "issues" but in the end it was not an issue, but my own fault not reading the manual properly.

 

In order to be able to select a missed approach, first you need to tune an approach in the FMC, so make sure there is a destination airport and approach programmed, otherwise you won't be able to select a missed approach. Go to the DEP/ARR page and select a runway/approach. After that, it should work.