Hi CaptCrash, et al,
This morning, I flew v1.3.1 (need to download the new version) and looked closely at the flight director behavior. When basic pitch modes like ALT, VALT, FLC, and VPATH are active, the flight behavior appears to be correct in that the FD pitch bar does not move and follow aircraft pitch changes. In other words, you can fly the airplane symbol up and down through the FD pitch bar, and bar does not initially move and also follow the FD pitch bar as is shown in the video when an APPR LOC and GS are active.
I flew the ILS 1R at KICT and the FD pitch bar exhibited the same behavior. As shown in the video, if an aircraft pitch change is made, the FD pitch bar initially follows that pitch change, e.g., pitch the nose up a few degrees, and the FD pitch bar follows it for a few degrees until the GS begins to deflect. I spoke to a friend who worked at Collins for a number 15 years and trained us on the Collins equipment about this and show him the video. He said that was not how it works. The FD pitch bar should remain steady and initially not move with the pitch change, and in fact, in anticipation of the GS needle moving downward it should deflect slightly downward. What the HS CL650 is doing with the respect to the ILS GS and the FD pitch command is not correct.
Next, I flew the RNAV (GPS) Y 1R at KICT. The approach was flown with LPV Level of Service (LOS). Initially, I used VNAV to descend through the T-Legs from BACAY. When tracking the VNAV in VPATH vertical mode, the FD pitch bar behaved as expected. In other words, you could change the aircraft's pitch attitude through the FD pitch bar without that command bar also moving. Naturally, as deviated off the VNAV path, the FD pitch bar would command a return to the path. Approaching the FAF (CUTIK), I selected APP Mode and the vertical guidance changed to VGP. In VGP mode, the FD pitch bar behaved like it does in the ILS GS mode, and as shown in the video. The FD pitch bar moves with aircraft pitch changes. As noted, this makes it very hard to track the FD command bars and track the VGP path.
Next, I came back and again flew the RNAV (GPS) Y 1R at KICT. This time, I downgraded the approach to LNAV/VNAV LOS by selected the ARRIVAL DATA page, selecting the APPR MODE to "RNP", which selected the GP MODE To "BARO". (see screen shots attached). So instead of flying LPV SBAS generated angular vertical guidance, the FMS would be using Baro-VNAV, linear guidance just like in the en route phase, but with smaller scaling. On this approach with LNV and VPATH as the FD modes, the FD pitch bar behaved as expected. The FD pitch command bar did not move and follow with aircraft pitch changes, but rather remained steady until there was a vertical path deviation at which it showed a command correction to return to the path.
It appears that the flight director issue is in both the ILS GS and LPV VGP vertical modes, that the FD pitch bar will initially follow a pitch change before it computes that maybe it shouldn't have, and then as the GS or VGP moves from the centered, "on glideslope/glidepath" position, the FD pitch bar initiates a command correction to command a pitch change to the return the aircraft to the glideslope/glidepath.
In both cases, as the aircraft pitch changes, the in GS or VGP, the FD pitch bar should not change and initially follow the aircraft pitch change. It should not move until the GS or GP needle begins to move off path, or according to my source from Collins, it should make a slight anticipatory command opposite of the pitch change to return the aircraft to GS/GP. At the very least, the FD pitch command bar should mimic the behavior in VPATH or the other basic FD pitch modes like ALT. These easily demonstrated in level flight with ALT engaged, in a descent following a vertical path and in VPATH mode, or on an RNAV approach using RNP and BARO set in the ARRIVAL DATA page (ps...kudos for getting this page right!).
I hope that this will help with the troubleshooting.
Thanks,
Rich