Thanks Bert for your continuous support.
I think the misunderstanding comes from how the GTN communicates with the other instruments in the plane.
When the PFD is in FMS mode (clicked on FMS on the DCP, pink needle on display on the lower part of the PFD) :
- GTN in GPS mode :
- needle on the PFD is pink
- A/P NAV mode is LNAV - A/P APR mode is available (why ???) but A/P has a particular mode (no lateral mode (blank, not even ROLL), ALT vertical mode)
- GTN in VLOC mode :
- needle on the PFD is pink but does NOT turn when you change course - A/P NAV mode is LNAV (but A/P real behaviour depends on what you ave on the frequency - VOR or LOC - it turns to catch ILS lateral beam for LOC or turns in round at very steep bank angle for VOR)
- A/P APR mode is NOT available
When the PFD is in NAV mode (clicked on NAV on the DCP, green needle on display on the lower part of the PFD) :
- GTN in GPS mode :
- needle on the PFD is greenand points to and unindentified direction
- A/P NAV mode is VOR1 but plane is turning errand
- GTN in VLOC mode :
- needle on the PFD is green and it does turn when you change course - A/P NAV mode is VOR1 - A/P APR mode is available
When you change the GTN CDI mode, it does NOT change the PFD mode. You have to change it manually by chosing NAV or FMS on the DCP. Additionally, to have A/P APR mode working properly, you need to change PFD mode to NAV.
So, for me, the way it works is :
PFD FMS = GTN GPS
PFD NAV = GTN VOR1 or Universal FMS VOR2
Do you know of any way to make sure that the GTN and the PFD are always "aligned", ie set as per the above ?
Thanks