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A.floor and Crazy autopilot After takeoff

Rainer Vorthmann
in AIRBUS A320 Family Discussion & Support
Hello,
I bought the A320/21 prolouge. During the fmgs programming I noticed a yellow message in the scratch pad coming up a few times wich says:unable flight level. I tried fl150 and it didn’t work. After the liftoff a.floor engages and the plane pulls up hardly. Then it goes into a fall and then it climbs again and it goes like this all the time. I noticed that in the ecam the landing mode was already active, but I had my flaps and gear up and the fmgs was still in climb.

Thank you !

Comments

  • Forum Admin 3Forum Admin 3
    Hi Rainer,

    It would be really useful to know what your flight plan was.
    The unable flight level message appears when the MCDU calculates the Top of Climb would be after Top of Descent, therefore you wouldn't actually make it to your cruise altitude.
  • Rainer Vorthmann
    My flight plan was: Lgsm-lark1c- larki-dct-varix-vari2c- Lgav

    I just wanted to make a quick test flight
  • Rainer Vorthmann
    In the pre flight manager there was about 80miles cruise on fl280. And the plane didn't take fl150
  • Forum Admin 3Forum Admin 3
    Thanks Rainer.
    There are a lot of variables here too, such as aircraft weight and weather. Did you change the weight of the aircraft at all?
  • Rainer Vorthmann
    I changed the weight of the aircraft at the beginning so that the tow of the aircraft was about the half.
  • Rainer Vorthmann
    I think the plane didn't find the cruise or the vertical mode. But I really have no idea
  • Forum Admin 3Forum Admin 3
    So, after take off you should reduce thrust to Climb (CLB) and engage autopilot. Click the altitude select knob so that Op Clb appears above the vertical horizon. This is optimum climb, where the autopilot works out the best climb vs. speed and controls the climb up to the selected altitude. If there are altitude constraints on your departure, it will take this into account too.
  • Rainer Vorthmann




    That is the problem
  • Forum Admin 3Forum Admin 3
    You have a lot of fuel onboard for a landing. Do you fill out the INIT pages? This gives the aircraft vital information for it to calculate V Speeds and manage the different stages of flight.
  • Rainer Vorthmann
    Yes, I filled out all necessary pages for takeoff and cruise. All pictures are taken + or - 2 minutes from takeoff. I have tried it many times but always the same problem. After the lift off the airplane plays roller coaster, and in a.floor I don't have any controls. I also can't get out of a.floor mode
  • Rainer Vorthmann
    And the plane didn't calculate v speeds automatically, you say in your post the computer calculates it. I'm sorry for my English, I am from Germany.
  • Forum Admin 3Forum Admin 3
    I will test this later to try and understand what is happening.
    The aircraft can calculate the V Speeds, right click on the buttons next to each V Speed section and it will fill in the correct speed automatically.
  • Rainer Vorthmann
    Ohh, I didn't right click it. But it didn't solve the problem with a.floor and the strange maneuvers
  • Forum Admin 3Forum Admin 3
    Alpha Floor (A.Floor) is the low speed protection system, so for it to engage the airspeed must be dangerously low. A.Floor is an Auto Throttle mode only, and when activated provides TOGA-equivalent thrust to the engines. A.Floor can be activated by the aircraft even when Auto Throttle is disengaged.

    That said, in your screenshots provided, I noticed you don't have Autopilot or Auto Throttle engaged - you should be using both systems to maximise your efficiency in terms of fuel, speed and climb, as well as reducing your workload as a pilot.

    I have just completed a test flight using your flight plan above, between LGSM and LGAV with no issues.
  • Rainer Vorthmann
    I can't engage the autopilot because the airplane was not stable enough. And I deactivated auto throttle to get out of a.floor. I try to reinstall the product later, maybe there was an issue in the installation.
    Thank you for your support, I will write you back if I try the reinstall.
  • Rainer Vorthmann
    I trie to make a video to show it better to you.
  • Forum Admin 3Forum Admin 3
    When you reinstall the product, make sure you run it as an Administrator and restart your computer afterwards.
  • Rainer Vorthmann
    After a reinstall everything runs smoothly. Thanks for your quick support!
  • Forum Admin 3Forum Admin 3
    No problems Rainer, I'm glad it is working :)
  • callum titheridge
    having the same problem
  • Jake WrightJake Wright
    Have you tried the above suggestions Callum?
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