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from your code above://(float)autoland = 1 ; } else { rwert = 0 ; everything after the // is a commentif the // is not intentional, then remove it. If it is, then put on the next line what has to be compiled://(float)autoland = 1 ;} else { rwert = 0 ; Hope this helps!

Thanks for your help JeanLuc, though the // was a typo; my apologies. It should read: if (*land == 1 && app == 1 && key_loc == 1 && *ap1_master == 1 && *ap2_master == 1 ) { rwert = 1 ; (float)autoland = 1 ; } else { rwert = 0 ; (float)autoland = 0 ; } return rwert;}It refuses to compile and claims that an Lvalue is required. What I don't understand is that *ap1_master, *ap2_master and *land are the Lvars (correct?) and these have been used in various callbacks without any problems.

I've resolved the issue with the rc file. Though this code in the C file still baffles me. Commenting out the function results in no errors and a working gauge file. :-hmmmAppreciate any suggestions. [/font size]

(float)autoland = 1casting goes to the other side of the = sign maybe in your case?

That's done it :)Thanks for your help JeanLuc, appreciate it!Best Regards,Andy