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Thread: Heading commands a slow turn

  1. #1

    Heading commands a slow turn

    I have an AFS4500 with Arinc box, when I use the Heading bug to turn it responds very slow and in low bank. How do I make it turn faster? I would like to whip the bug 30 degrees left or right and it respond more aggressive. Thanks!
    Last edited by Mastro; 01-15-2012 at 04:25 PM.

  2. #2
    Step 2a Adjusting Autopilot Lateral Gain Settings

    Whenyou adjust the heading bug to a new heading over 90 degrees away the planeshould capture the new heading with minimal overshoot.

    Thereare two Gain settings that control how the airplane responds in Lateralcontrol.

    EFISROLLGAIN ; This is set in the EFIS AP/FD -> SETTINGS -> LATERAL -> ROLLGAIN
    APLateral Activity ; This is set in theAutopilot

    TheEFIS ROLLGAIN controls how far the airplane should bank for a new heading. TheAP Lateral Activity controls how fast the autopilot roll servo responds to rollcommands.

    STEP 1 ADJUSTINGTHE AP SETTINGS

    1. Verify that the AP LAT Torque is set to 12
    2. Engage the Autopilot using the AP button so that the aircraft is following the heading knob on the Autopilot.
    3. Adjust the LAT ACT on the autopilot so that the aircraft performs well when you turn to a new heading using the AP knob. You should make turns of over 90 degrees and continue to adjust until you are satisfied with the results.

    STEP2 ADJUSTING THE EFIS SETTINGS

    Youcan check the current commanded bank angle being sent from the EFIS to the AP fromthe check list page, it is displayed asAP ROLL. The EFIS uses the followingcalculation for AP Roll angle.

    APROLL = (Heading Bug – Magnetic Heading) * EFIS ROLLGAIN

    HeadingBug 090
    MagneticHeading 360
    EFISROLLGAIN .05

    APROLL = (90 – 360) x .05
    = -13.5 degrees of bank angle

    TheEFIS limits the maximum bank angle to what is required for a standard rateturn.


    1. Engage the Autopilot using the EFIS button so that the aircraft is following the heading bug on the EFIS.
    2. Adjust the ROLLGAIN on the EFIS so that the aircraft performs well when you turn to a new heading. You should make turns of over 90 degrees and continue to adjust until you are satisfied with the results.

    Ifthe EFIS ROLLGAIN is set too low the airplane will tend to be sluggish and slowto respond to new headings. If the EFISROLLGAIN is set too high the airplane will tend to overshoot the heading bugand be jittery.
    Rob Hickman
    Advanced Flight Systems Inc.

  3. #3

    Thumbs up Ops check good!

    Thanks Rob!

    I adjusted the EFIS RollGain.

    Mine was set to 0.02, I set it to 0.05 as recommended and it worked perfectly.

    I did try 0.6 & 0.07, but felt it may be a little more bank then I want on A/P and like you said, standard rate was really my goal and that has been achieved.

    Thanks,

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