Hi,I'm finding I'm getting ADD DRAG messages, even though the aircraft will comfortably make an altitude/speed restriction without it. Anyone else noticing this? All it is doing is increasing the descent rate so I spend more time leveled out at a lower altitude.It doesn't occur all the time, but more often than I thought it would?Best regards,Robin.

Yes, I'm getting that also. The problem is that the aircraft waits too long to start the Top Of Descent causing it to overspeed and require drag. It happens 90% of the time for me. It should actually reduce speed before reaching TOD.http://www.precisionmanuals.com/images/forum/pmdg_trijet.jpg

Same here. The aircraft properly maintain an FMC speed but it shows an ADD DRAG message. Why?Matyas Majzik

Just completed a bad weather flight from EGLL to LSZH and on the descent from FL370 had Add Drag message on 4 separate occasions and had to action it twice. This normal?Konrad

>Just completed a bad weather flight from EGLL to LSZH and on>the descent from FL370 had Add Drag message on 4 separate>occasions and had to action it twice. This normal?>>KonradIt's possibly the bad weather you were experiencing caused some of it, but the main issue is the FMS is commanding too much thrust and the same time it needs to reduce thrust. Should be an update issue.Bryan Gandallhttp://www.precisionmanuals.com/images/forum/pmdg_trijet.jpg

I also get this occationally. What I also noticed is that there is almost no drag at all when deploying the speedbrakes.

Staffan[/font size]

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>> What I also noticed is that there is almost no drag at all when >> deploying the speedbrakes.Are you sure the ATS isn't adding thrust? The speed brakes do work. :)Best regards,Robin.

Vangelis will have to verify if there's actually an issue going on here, but there's some information in the FAQ about ADD DRAG:http://ops.precisionmanuals.com/wiki/PMDG_...DD_DRAG_mean.3F

The speed brakes work for me, and effect for me is proportional to how extended they are, and the sound volume actually varies with the amount applied.All my flights thus far using the FMC descent profile have systematically had me apply drag on descent, the descent rate computed in the default profile will almost invariably cause the aircraft to accelerate even in idle descent. I should also note that I'm a bit heavy for the descent, not quite having mastered the fuel calculations yet. Anyone with a good fuel calculator handy, please post references! :)Etienne