PMDG 737 NGX SIDs

[Christopher Low 4,614]

Please note that I am referring to the PMDG 737 NGX here (not the new NGXu version). I have noticed over the past couple of weeks that the autopilot seems to struggle slightly with a handful of SIDs in the UK. The two examples of this that I have seen recently are as follows....

• DTY 4F departure from runway 33 at EGBB Birmingham
• ORTAC 3A departure from runway 26 at EGJJ Jersey

The DTY 4F SID included a slight turn to the right, and then a 270 degree left turn loop. A bit further on, my plane decided to turn 90 degrees to the left, and then right again (on what should have been a direct course) prior to an (INTC) waypoint.

The ORTAC 3A SID included a 270 degree left turn loop (when I should have been turning roughly 90 degrees to the right), and then a full 360 degree left turn loop halfway to an (INTC) waypoint (which should have been direct).

Two rather anomalous departure tracks for no apparent reason. I find the initial 270 degree loops to be difficult to understand, and the 360 degree turn on a direct course is clearly not supposed to happen. Has anyone else experienced anything like this with the 737 NGX? Can anyone confirm whether there is a reason for these strange trajectories? The initial left turn loops during both SIDs were on the ND, but that 360 degree turn certainly was not. I have decided to avoid these two SIDs in future with the 737 NGX, and will restrict my departures to direct flights towards an NDB/VOR etc.

This is with P3Dv4.5HF2

Edited May 13, 2020 by Christopher Low