Vertical Navigation of Approach Stepdowns for ILS with VNAV - GFC500/GTN750Xi
Went up today and feel like I have everything squared away for using VNAV into RNAV approach. I can verify constraints, arm both VNAV as well as APR, and given the lateral course is GPS for an RNAV approach, the VNAV will function all the way through initial step downs smoothly all the way to the FAF** to capture GP.
But ILS approach is different due to switch to Localizer (green needles) that throws some wrinkles as VNAV will NOT function unless it's following a GPS course.
I'm curre
Okay, I went out and did some testing today. Certainly I think found something workable. First two approaches I had Auto Switch CDI enabled. The last two I had CDI switch to Manual.
1) KGXY ILS35 from the north with HILPT. 7000 ft with FAF 6600 bugged. AP: NAV/ALT with APR armed = GPS (Grn) / LOC (white), ALT 7000 (Grn) / GS (white). What I found is that the CDI switched immediately on passing WELDS [fix before FAF & first fix on the FAC). --> LOC (Green), ALT 7000 (Green) / G
