For single-pilot VFR operations, 14 CFR 135.105(c)(1) requires that:

The autopilot is capable of operating the aircraft controls to maintain flight and maneuver it about the three axes

Does this mean an autopilot with roll, pitch, and a yaw damper would qualify?

  • $\begingroup$ Airplanes with yaw damper systems have 2 axis autopilots. That talks about an autopilot with control about the 3 axes, so I might interpret that as a 3 axis autopilot requirement. Yaw damper systems have very limited yaw authority (about a third of rudder travel) and perhaps that's insufficient for single pilot IFR because the rudder channel needs to be able to cope with asymmetric power/thrust, which a yaw damper doesn't have to deal with. $\endgroup$ – John K Feb 22 '19 at 4:33
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    $\begingroup$ Looking around a bit, single pilot jets like the Phenom 300 have 2 axis autopilots with yaw dampers so it would seem the answer is yes. $\endgroup$ – John K Feb 22 '19 at 4:41
  • $\begingroup$ I am ignorant of the rules for part 135. Can a Phenom 300, or any of the turbine aircraft, be flown single pilot outside of part 91? Bear in mind these aircraft fly ain the flight levels normally, thus IFR. $\endgroup$ – Mike Brass May 28 '19 at 7:27
  • $\begingroup$ The Phenom 300 is single-pilot certified so the autopilot requirement is moot. $\endgroup$ – Juan Jimenez Jun 6 '19 at 15:24

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