For testing autopilot capability simulation/notify-trigger Output message at periodic intervals simulation/notify-trigger ge 0.5 position/h-agl-ft velocities/vt-fps propulsion/engine[0]/propeller-rpm propulsion/engine[1]/propeller-rpm propulsion/engine[0]/power-hp propulsion/engine[1]/power-hp propulsion/engine[0]/thrust-lbs propulsion/engine[1]/thrust-lbs propulsion/engine[0]/blade-angle propulsion/engine[1]/blade-angle fcs/rudder-pos-rad fcs/mixture-pos-norm[1] fcs/yaw-trim-sum Start engine and set initial heading and waypoints, turn on heading-hold mode. simulation/sim-time-sec ge 0.25 Set one engine to idle. simulation/sim-time-sec ge 250 ap/rudder_cmd Put some data out before we hit the ground simulation/sim-time-sec ge 100 position/h-agl-ft le 50 We hit the ground simulation/sim-time-sec ge 100 position/h-agl-ft le 10 velocities/vc-fps ge 145.0 position/h-agl-ft ge 40 velocities/vc-fps ge 300.0 Set heading hold to selected waypoint (setpoint) instead of previously specified heading when altitude surpasses 800 feet. position/h-agl-ft ge 800 guidance/wp-distance When the aircraft arrives back at Ellington Field (fifth waypoint) then terminate the simulation. guidance/wp-distance lt 100 ap/active-waypoint eq 5 guidance/wp-distance When the distance to the fourth waypoint (northeast end of Galveston Island) is less than 100 feet, then set the last waypoint (back to Ellington Field). guidance/wp-distance lt 100 ap/active-waypoint eq 4 guidance/wp-distance When the distance to the third waypoint (southwest end of Galveston Island) is less than 800 feet, then set the fourth waypoint (northeast end of Galveston Island). guidance/wp-distance lt 800 ap/active-waypoint eq 3 guidance/wp-distance When the distance to the second waypoint (Hobby Airport) is less than 500 feet, then set the third waypoint. guidance/wp-distance lt 500 ap/active-waypoint eq 2 guidance/wp-distance When the distance to the first waypoint (Hobby Airport threshold) is less than 700 feet, then set the second waypoint. guidance/wp-distance lt 700 ap/active-waypoint eq 1 guidance/wp-distance