Basic Autopilot issues

Bug Reporting Hub Aircraft & Systems
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1

Dear team,
This is in reference to basic AUTOPILOT issue. ( NOT Garmin)

The arm function is INOP for altitude . Therefore, after engaging altitude the VS comes to 0 and after take off the aircraft levels of since VS on AP is 0, And we have to set the desired VS again to get it climbing.

Is there any fix for this annoying issue?

Thanks

2

If the altitude is engaged after takeoff, the aircraft can climb to the set altitude using either VS or FLC. The AP will then change the trim based on the VS or FLC. FLC keeps the airspeed fixed; that is, FLC @ 95 kts will keep the airspeed at 95 kts while climbing. VS keeps the rate of climb fixed; that is, VS of 1,000 fpm sets the trim to climb at 1,000 fpm. If the aircraft doesn’t have enough power to maintain a VS of 1,000 fpm, the AP will continue to trim the aircraft to maintain 1,000 fpm climb. Eventually, the trim adjustment is at 100% and airspeed starts dropping. If it gets too slow, the aircraft will stall and the AP will automatically disconnect since the AP is not designed to do stall recovery. The aircraft will not stall if FLC is used instead of VS.

3

Basic autopilot has no FLC ..

4

The KAP140 autopilot, which is the basic one modeled in the sim doesn’t work correctly. It is supposed to enter roll mode and VS at the current rate of climb when activated. What happens in the sim, is it goes to VS and sets the VS to 0 and levels out.

5

Exactly the problem, any solution?

6

Unfortunately, unless Asobo or a third party releases a mod that fixes the autopilot behavior, we will have to live with it. What’s sad, is the JPL freeware mod for the Cessna 152 adds a KAP140 autopilot that isn’t 100% accurate, but reacts much better than the default.

7

Not only does VS go to zero but I’m seeing in the MilViz PC-6 that if you hit either the up or down button on the KAP140 after selecting a fairly large alt change that the aircraft Nose Pitches Steeply and VS jump to about +1500 or -2200 there seems to be be no way to get it to step in +/- 100FPM increments. There are SOO many things wrong in the stock KAP140 useage experience…