Originally Posted by
galaxy flyer
Speaking Collins now, VGP is an approach mode for Baro VNAV that replaces VPTH. So, you enter an approach with a charted Baro VNAV descent gradient; arm APPR and VNAV, and intercept the course and path; the FD mode changes to VGP and the FD/ AP now behave like it is an ILS. Particularly the ALT Selector which can now be set to the missed approach altitude. The FD will NOT have a level-off altitude as in a non-precision approach with a MDA, the pilot will see a GP to the runway.
It does make compatible approaches more like an ILS; is not a substitute for LPV (it was developed prior to LPV) and is on all ProLine 4 and 21 installations, at least all Bombardier ones.
GF
Winning response, thanks. Various pieces of gear are hard to understand if you have never used them. I have not used baro-VNAV so am guessing you can't couple to most baro-VNAV approaches although you can possibly still get the FD indications.
The way I understand VGP is, it gives you a calculated glidepath based on whatever it uses (blended RNAV, Baro-VNAV, GPS?) which allows you to fly a coupled approach all the way down. There apparently is also some advantage to this besides being coupled, such as freeing the alt bug for other purposes which suggests it would need to be stuck at minimums otherwise.
Getting warm?