June 14, 20169 yr So I've got the local GTN mods, and v1.8 overhaul from the wonderful folks here at avsim. I'm really not thinking my IAS mode is working right though. My routine is: Set FD and Nav or Hdg on runway Takeoff, engage AP, clean up aircraft Hold 130-140kts Hit IAS, then dial altitude and hit arm When I do the above the airspeed will continue to decrease until I take it out of IAS, gain more airspeed and hit it again. The second time it will usually hold a steady speed at 10-25kts faster than I have set. Am I doing something wrong or is this typical behavior from the IAS mode??
June 14, 20169 yr Did you read this forum post? http://www.avsim.com/topic/452595-guide-correct-use-of-pc-12-autopilot-kmc321kac297/ Todd
June 15, 20169 yr Author I have read that thread, and that seems to be how I'm operating the AP. I'm not quite sure mine seems to be a bit of a chore.
June 15, 20169 yr I haven't flown in awhile but I do recall the AP struggling to maintain the set IAS. It was never off by as much as you seem to be getting. Try trimming the airplane and set the target altitude before engaging AP. I don't recall if it was ever fixed. Shuai Li
June 16, 20169 yr Author I have noticed the PC-12 doesn't autotrim under AP. Maybe that has something to do with it. I'll try trimming it up before engaging IAS.
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