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Thread: Advanced autopilot

  1. #1
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    Advanced autopilot

    I was flying this approach last night for practice.
    http://204.108.4.16/d-tpp/1105/00785R26.PDF
    all was going well on the autopilot
    i put in 1450 for minimums(cannot select 1420-if would be nice to be able to put in actual minimums)
    i put the MAP altitude in 4400
    plane leveled off at 1420 but when i added some power it started to climb before reaching the MAP
    i'm using a 430w
    is this normal?
    What should the autopilot do at minimums?

    alan

  2. #2
    Advanced Flight Systems, Inc.
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    If you add a significant amount of power at the MAP, it will cause the airplane to climb a bit. Remember the servos are holding altitude so when you add a bunch of power, it takes some time for the servos to compensate for the increase in power and keep the aircraft level. It also depends how much power you are adding. If you are at 18" in a stabilized approach and bring it up to 20" at the MAP, it shouldn't do much. If you are at 12" in the approach and bring it up to 20", it will probably pitch a bit before it stabilizes.

    We did debate the minimum altitude scale and determined that 50ft intervals were the most convenient and prudent option. 25ft increments caused it to take too long to run up and down, 100ft increments were too large. Realistically, most of our customers don't fly in IFR conditions where 20ft means landing or going missed.
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

  3. #3
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    trevor i was about 12 inches and added power to about 19 inches to level off. At the MAP should the ap start the climb if I unsuspend the 430w?
    Alan

  4. #4
    Advanced Flight Systems, Inc.
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    Yes, if you press SUSP on the GNS-430W upon reaching the MAP waypoint it will resequence the 430W and 4500 to the next waypoint and the autopilot will go from V:MINS to V:ALT and start climbing to the altitude bug set.
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

  5. #5
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    Thanks. While on the subject how about adding a GA( go around) feature to the autopilot?
    Alan

  6. #6
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    Another AP question Trevor. If at the MAP there is a course change say climb to 4000 then turn toward a fix will the AP do that?
    Alan

  7. #7
    Advanced Flight Systems, Inc.
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    I'll mention the TOGO feature to the software guys. That is nice to have, its common practice on larger aircraft.

    If at the MAP there is a course change say climb to 4000 then turn toward a fix will the AP do that?
    The autopilot won't do it automatically. You'd have to be in HDG mode to fly the current heading until reaching the desired altitude.
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

  8. #8
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    trevor,
    i was reading the vsvg manual and it says while doing an ils approach hitting any button on the ap will start a 500fpm climb .
    Alan

  9. #9
    Advanced Flight Systems, Inc.
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    Alan,

    Are you sure you were looking at the VSVG manual? The Digiflight II VSVG isn't capable of doing ILS/LOC/VOR/NDB approaches. It can only accept deviation commands via GPS.
    ---
    Trevor Conroy
    Technical Support
    Advanced Flight Systems
    Support@Advanced-Flight-Systems.com

  10. #10
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    Trevor,
    I should have said glide slope not ils. Here is the link to manual.http://www.trutrakflightsystems.com/...tingManual.pdf
    read page 10-11. vertical mode and missed approach.
    Alan

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