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FD too agressive in initiating turn

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I think the FD is well done and very smooth. Of course, in my experience in the KLM 738 sim the real thing is even better, but it better well be at that price tag. One thing that particularly struck me in the real thing was the behaviour when initiating a turn. I was handflying and asked the co-pilot to set the new heading, to the left. What happened was that almost imperceptably the FD would move to the left and nearing the new heading to the right. By doing nothing but concentrate on the FD you'd almost unconsciously make a very smooth turn, get to the right bank angle and get back out at the right heading. Now, getting out of a turn is done very well in the sim, the PMDG one, that is, but when you set a heading for say a 90 degree left turn the FD gets almost to the extreme left of the ADI. This happens not just when hand-flying in which case you could blame me :-) but also when in A/P. Since the FD is an integral part of the AFDS system, logically speaking during automatic flight the FD should always be centered or at least close to it, right?Leo Bakker

>always be centered or at least close to it, right?It takes auto-pilot servo motors some time to react to FD commands and they have to overcome the whole mass of the aircraft (plus some bank angle limits) so in fact it is not unusual to see FD getting noticably ahead of the AP during the 'automated' flight.Michael J.

Michael J.

".....but also when in A/P. Since the FD is an integral part of the AFDS system, logically speaking during automatic flight the FD should always be centered or at least close to it, right?"I've read that there can be a discrepancy between the two on other aircaft, but only the Loc capture period has been mentioned, Leo.I can't comment on ops in the air, but FD commands on the ground during tests always seem to be very smooth and unhurried, even though I crank in large V/S's.Cheers.Ian.P.S. Edited due grammar.

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