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VIOLENTJERKING WHEN ENGAGEING HEADING SWITCH

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Yes add me to the list. I get this too, just as all the others have described. Iain Smith

Real world procedure: Even when flying in LNAV you should always match your heading bug on the ND to match the upside down triangle. This gives you protection if you either:A) modify and execute an accidental point in the FMC orcool.png ATC asks you to maintain present heading. Its a good procedure to limit bank angle on the MCP heading selector to 10 Degrees above 30000 Feet as you don't get maneuver margin protection in heading select (high weight, high altitude, steep bank angle = increase G loading = Potential Buffet) The 10 degree limit at high altitude will reduce the tendancy to "jerk violently" when switching to heading select because the FCC is aiming for a much smaller angle of bank. That combined with your matched heading should infact result in only a tiny correction ~1 degree in your heading when you switch to heading select from Lnav. Try it then report back.Experiment 1: 65 Tonne aircraft, 35,000 Feet, mach .79 Bank angle selector set to 10 degrees in stable cruise flight following an LNAV track.Your task: Match the heading, then go 'HDG SEL' verify the FMA. Does it jerk? set a heading 90 Degrees left or right of your current heading. Does it jerk? --- Repeat the above but with the bank angle selector set to 30 degrees in the same conditions. Now for the the next step you need to reselect your first LNAV waypoint on the legs page, verify it is logical then execute, once the white dashed line is gone from your LNAV track, select LNAV on the MCP, verify the FMA. Once you are established inbound to the waypoint on your LNAV track you can try the next step. Experiment 2: Set a heading 90 degrees off your current heading/ track. Set the bank angle selector to 30 degrees, Engage HDG SEL, verify the FMA and take note of the 'jerk' now select a bank angle of 10 degrees. Set your heading 90 degrees off your heading/ track and engage HDG SEL, is the jerk less violent or the same? If it is the same in all 4 tasks then maybe you have something. But remember HDG SEL is targeting a bank angle up to the maximum selected on the bank angle pointer to reach the target heading i.e what you have selected on the MCP. the bigger the heading change, the more aggresively the AFDS system is going to roll to the limit to reach the heading. As for the VOR/LOC mode: it prioritises capturing the radial/localiser over roll rate/comfort. It will roll up to 30 Degrees at the rate it sees fit depending on your closure angle and speed to the selected radial/localiser. It does this regardless of the bank angle limit you have on the MCP. Infact VORLOC capture can commence even before the magenta deviation bar even begins to move. Watch your FMA's and you'll see. Happy to help,Tawanda

  • Commercial Member

Tawanda, Your post makes sense, but you also have to consider the point in which ATC gives you a "fly heading 010 after ELISN." In that case, I'd preselect 010 using the heading select knob, and remain in LNAV until selecting HDG directly. I wouldn't likely set my current heading and then roll it to 010 while in HDG SEL.

Kyle Rodgers

  • Commercial Member

We got you covered with the HOT FIX... Even if it stutters. PS. I really resent some comments posted upstairs and more than appreciate a few others. Antithesis. Relax and enjoy...

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E M V

Precision Manuals Development Group

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I have this as well. nice to see it will be in the hot fix. You guys r on top of the issues as always. Great Work William Coade

William Coade
Boeing777_Banner_Pilot.jpg

I had this jerking thing when selecting heading.. but now is fixed. all you have to do, is disable the head movement in the cockpet and everything becomes very smooth.

FEX order # FSS0049972

I had this jerking thing when selecting heading.. but now is fixed. all you have to do, is disable the head movement in the cockpet and everything becomes very smooth.
Good tip... but I don't think it solves the problem. I'm using the 2D panel and the "jerking" is there (as well as the VC).
We got you covered with the HOT FIX... Even if it stutters.
Do you mean the current hot fix solves the problem? Or do you mean it will be solved in an upcoming hot fix? Thanks for your hard work, great product!

Matthew S

Hello, same problem with me when capturing LOC at larger angles or at larger HDG changes. Patric

you have to try before u thing if it's going to work or not, beleave me it did fix it

FEX order # FSS0049972

if u want to fix the jerking.. u need to go to the fsx root and edit the headmomentum to NO iin the camera cfg. file. trust me this will resolve it

FEX order # FSS0049972

  • Commercial Member
Good tip... but I don't think it solves the problem. I'm using the 2D panel and the "jerking" is there (as well as the VC). Do you mean the current hot fix solves the problem? Or do you mean it will be solved in an upcoming hot fix? Thanks for your hard work, great product!
Yes the hot fix should reduce considerably any tendency to "rock the wings" when the roll mode changes. We found a couple of situations where this could be triggered. The head motion tip above might also be of value and beneficial for many other situations (e.g. allows better and more ergonomic interaction with mouse click areas when aircraft is turning or pitching). Thank you for you kind words.

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E M V

Precision Manuals Development Group

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  • Author

Yep done the hot fix aug 16th now it turns a lot lot smooother. so has sombody done somthing?thanksjames.

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james west.

All I can say is "Me too"

Yes they did.

Regards
Jannie Roelofse

Flight1 Software Project Manager

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