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Guest UNDpilot

A319 vertical autopilot not following FD

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Guest UNDpilot

Ok I'm going to reword this, after some more testing I've come to the conclusion that my autopilot will not pitch properly at all. On climbout, it pitches too high resulting in A-FLOOR/TOGA. During cruise, it oscillates up and down, deviating from my selected altitude, and occasionally the A/T will pull power causing me to loose a ton of altitude. On descent, the pitch barely does anything. All it does is nose down and go extremely fast, not following the FD. Each portion I am using the altitude select knob and pulling it. I can somewhat control the pitch using the trim buttons, but I thought trim was automatic? I've followed the tutorial word for word, and the FMA reads correct for all portions of the flight. IS there a reason the autopilot is not following the FD?Thanks.DanUniversity of North DakotaCommercial Aviation Major

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Guest vrandar

These symptoms do seem to be worse if you are n ot following our standard recommensatio which is to start your FS session and default flight with a default MS aircraft ad then switch to the PSS Airbus.Autotrim is modelled but I find that to sensibly hold V2+10 on climbout I need to manually set the pitch trim. I usually set it to -2.0UP but I suggest you juggle with the setting to see what works best for you. On my MS keyboard tis is the Home and End keys. On climbout I am rarely in managed mode until after accel altitude and generally spend much of the descent in selected mode as well.Rob Elliott, EGPE InvernessPSS Airbus Support andAirbus Fleet Training Captain, British Airways Virtual airbus@speedbirdonline.co.ukhttp://www.speedbirdonline.co.uk/airbus.htmlhttp://www.bavirtual.co.uk

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Guest dt1951

Hi Dan, it sounds like you are going a bit too fast when you select the A/P. You should not be going any faster than V2+10 or so when you turn on the A/P. If you are faster than this when you do turn it on, the plane will pitch up to reduce speed to it's (MCDU) programmed velocity. Yeah, this then causes other problems. You can manage your own climb as Rob suggests, or be closer to V2 when A/P is turned on.

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Guest cobrafly

I don't know if it's implemented in PSS but in the real the autotrim does'nt work in "ground mode" (that's why we set takeoff trim manually).the airplane reverts to flight mode only 50FT min after airborn with pitch at or above 8

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