Abrupt nose down on selected ALT

[michael1508]

Hi all,

since some months I am experiencing an abrupt nose down of the plane, when I pull the ALT knob for a selected lower ALT.
Before the movement was much softer.

This happens with different weights & balances. I can't say since when exactly. I just know, this wasn't the case before and I haven't made any changes to my flight model.

Decending in managed mode works fine.

Is this only me or do you experience similar?

[masterp]

I have the same issue, only when pulling the ALT Knob (OP DES)
Managed mode DES or V/S still smoothly pitch down.

[Firefly77]

Same here ! It started with B59…
Br Mic

[Eintagsflieger]

Same issue here, tested with B59.1 and B61 in Prepar3D V6.
Sometimes (not always) Open Descent is far too aggressive with 10° pitch down, sink rates of up to 8000 ft/min, and increasing speed.




My Workaround is to disconnect the Autopilot, pull ALT and wait for about 20 seconds until the FD normalises. Then engage the AP again.
Any ideas?

[masterp]

I still had this issue with B61.4.2.
Autopilot Open Descent is too much aggressive pitch down, "Don't Sink" GPWS and speed increased close to Vmax red line.

[Capt. PERO]

No issues with B61.4.2 and P3Dv5.3 so far. Just tested yesterday.
INIT A and INIT B pages in MCDU properly set?