@Paul, maybe the Heading Problem could be prevented when not only turning the Headingbutton. Everytime I use it, first I push it. I hope this will work. :(

hi Peter,this is a meanwhile workaround for me, which i have posted already in this thread. But i normally do it when i am expecting an upcoming ATC heading command. I have already told, that it is no 100% prevention for me, there were on or two situation, turned wrong although pushing at current heading.hope you've fixed your stucking at runway troubles:-)regards

Why are you guys not pressing the Hdg/Trk button to zero it to current heading before you change it ? And why aren't you checking the arc before you select HDG mode? If you don't like the arc how long can it take to push the button, start turning it, pull the button to have the aircraft start the turn and then finish turning the knob to desired heading? For you guys understandably embaressed about doing a 360 in the middle of nowhere, what were you doing and for how long before you noticed you were turning in the wrong direction?

Hi paul,why do you still ignore that the arc indication is a very strange behaviour, even it is easy to copy now.As far i know, the function of the the white dotted arc is to indicate the correct turn of the aircraft in every mode, but it shows a wrong indication, cause i said, the turn in is shown correctly when i am still in "NAV" At the moment i pull the heading bug it changes the indicated turn to real turn, that is too late!There is still no official statement, that the original aircraft has this strange behaviour, too. meanwhile it seems to be a bug, sorry.No other PMDG aircraft has this behaviour, when i turn left heading, i can expect the aircraft is willing to turn left in every situation!There is no need to put lipstick on the pig;-)

@Paul SmithPGBosak

Guys, I have nothing to do with PMDG, nor do I have access to any special knowledge other then what I read in the manuals and on this forum or what I see on the screen, but even so, let me remind you of the basic purpose of the arc. It is to tell the pilot which way the plane would turn to acheive the target heading if the heading button was pulled at that moment in time. If the pilot does not like what is displayed, then by pressing the button instead of pulling it, they reset to current heading. Now since nobody has been able to show the plane turning right with an active arc showing left, or vice versa, can we accept that there is no problem with the actual turn (and no excuse for turning in the wrong direction) and move on. Since it is not fully documented, may I suggest you spend ten minutes playing with the system and seeing how it responds. I found it pretty simple and intuitive, the only surprise (though it made sense with hindsight) was the behaviour when NAV mode turns the aircraft through the selected HDG. Also worth noting if you fly with ATC a lot is the difference in behaviour between when the marker triangle is solid and when it is hollow, and how to transition between the two modes. My estimation of the PMDG systems guys went up another couple of notches when I found that out.[EDIT @Peter Hornfeck, The difference between your screen shoot C and D is that NAV mode has taken the aircraft through the selected HDG value and more then 5 degrees past it. If you pulled the knob at that moment, you are telling the AP that you expect the plane to continue the turn it is in until the desired heading is reached, in other words, another 350 degrees. If you want to abort the turn and leave NAV mode, push then pull the knob]

@Paul Smithplease believe me. The PMDG MD 11 is the best addon I know. And I use the B737NG and B747. Both airplanes are worth to buy, I like them too. But the MD 11 is phantastic, the simulation of alternate gear, the VC, all is absolutley top of programming and the developers did a top job. The pdf are very good to understand, a lot of informations available. Really, the PMDG MD 11 is the best addon on market.But you can also believe the situations we describe. I gave 3 examples of this programm error. The pictures of my first example are not so clear as the pictures of Paul. But it is the same problem.Your opinion is, you turn the knob, the arc shows you the turn-direction. If you like it, you pull the knob. If you do not like it, you push the knob to reset the HDG to the currenct flown heading and then turn the knob to the direction you want. That

...We turn the knob, the arc-line shows us the turn direction we want to fly. So, we pull the knob and the arc-line changes to the other direction . We do not expect this. ...

If this happens while the aircraft is flying straight and level then you have found a bug which I have never seen. If this is what you have seen, please say so and I am sure the developers will add it to their list. But if this only happens as you have shown in your screen shots 'C' and 'D', then I think the explanation I have already given covers this and that it is a miss-understanding of the function, not an error in the program. Do you agree?

sorry paul, this isn't nearly an argument!

Did you read the rest of my post? If so, which bit do you not agree with? Do you know what the hollow and solid marker triangles indicate yet?

...[EDIT @Peter Hornfeck, The difference between your screen shoot C and D is that NAV mode has taken the aircraft through the selected HDG value and more then 5 degrees past it. If you pulled the knob at that moment, you are telling the AP that you expect the plane to continue the turn it is in until the desired heading is reached, in other words, another 350 degrees. If you want to abort the turn and leave NAV mode, push then pull the knob]

Please read my posts. I wrote, that if I would pull the button BEFORE the waypoint the airplane would change the course to the right without showing an arc to the right before pull the knob. Because I didn

It must be a bug because this behavior is not common:Switching between HDG - DIRECT INTC -> everything okaySwitching between HDG - VOR -> the bug is visible under the explained circumstancesSwitching between FMC - HDG -> the bug is visible under explained cirumstancesSwitching between TRK - HDG -> but is visible under explained circumstancesIf you like it, you can try by yourself:RJBB, after departure HDG 234 -> VOR TMEafter overflying VOR TME fly outbound Radial 234Distance 18.8 NM after VOR TME - Change to VOR AJE Radial 184, Course = 004So the airplane have to turn right To do this:Enter AJE Frequenzy and Course 004 into FMC, but do not activate it.Nearly 10 NM after overflying VOR TME I prepare to intercept the VOR AJETo do this, I turn the Heading knob to 334

It must be a bug because this behavior is not common:Switching between HDG - DIRECT INTC -> everything okaySwitching between HDG - VOR -> the bug is visible under the explained circumstancesSwitching between FMC - HDG -> the bug is visible under explained cirumstancesSwitching between TRK - HDG -> but is visible under explained circumstancesIf you like it, you can try by yourself:RJBB, after departure HDG 234 -> VOR TMEafter overflying VOR TME fly outbound Radial 234Distance 18.8 NM after VOR TME - Change to VOR AJE Radial 184, Course = 004So the airplane have to turn right To do this:Enter AJE Frequenzy and Course 004 into FMC, but do not activate it.Nearly 10 NM after overflying VOR TME I prepare to intercept the VOR AJETo do this, I turn the Heading knob to 334

Hi Paul,Navigraph Charts RJBB ILS-24 LMissed approach RWY 24LClimb on HDG 238

Hi Paul,Navigraph Charts RJBB ILS-24 LMissed approach RWY 24LClimb on HDG 238

if you can describe a flight situation, with screen shots, that others can reproduce, which demonstrates results that are not easily explained,

Just an intermediate remark:@Capt. Paul G. B.quoting from your post#49:[[ a good pilot always tracks the heading bug to current heading, as well he is in NAV mode. So do i ]]On the MD11 it makes non sense to regularly synchonize the heading bug with present heading during NAV or VOR ARM modes.Try to limit your heading selections during NAV and VOR ARM modes to preselects only.Hope it helps solving this problem.Regards,Harry

15 years ago I did my own business in developing applications for companies. My explanation of the error is correct and a developer with knowledge could understand what happens in the source code. It