Problems with autopilot stability

The most prominent aircraft to display this issue is the fs9 Baron 58. The aircraft will not follow a stable course. It circles around. I'm hoping that someone will have a solution.

 

Thank you.

 

 

Michael Verlin

You didn't provide too much detail but, let's confirm your terminology here first. You said "course." Is that what you are dialing in instead of "heading" which is marked "HDG" on the panel? Those are not the same.

This particular aircraft won't stay on course when the autopilot is engaged. After a short period when the HDG or NAV command is entered, the compass card on the HSI begins to rotate around 180 degrees, but it won't stabilize. All of the aircraft in my collection other than the MS Baron don't manifest this peculiar behavior. Any help is welcome.

I suspect a corrupt or incorrect line in the aircraft.cfg; the AP gets data from the indicators, if any of these have been set to "none" there is no reference for that axis.

 

These are pertinent lines from the default file:

 

[direction_indicators]

//1 Type: 0=None, 1=Vacuum Gyro, 2=Electric Gyro, 3=Electro-Mag Slaved Compass, 4=Slaved to another

//2 Indicator number of slaving indicator if Type = 4

direction_indicator.0=3,0

 

[attitude_indicators]

//Type: 0=None, 1=Vacuum Gyro, 2=Electric Gyro

attitude_indicator.0 = 1

 

[turn_indicators]

//Type: 0=None, 1=Electric Gyro, 2= Vacuum Gyro

turn_indicator.0=1,1 //Turn and Bank

 

 

 

[autopilot]

autopilot_available= 1

flight_director_available= 1

default_vertical_speed= 700.0

autothrottle_available= 0

pitch_takeoff_ga=8.0

max_pitch=10.0

max_pitch_acceleration=1.0

max_pitch_velocity_lo_alt=2.0

max_pitch_velocity_hi_alt=1.5

max_pitch_velocity_lo_alt_breakpoint=20000.0

max_pitch_velocity_hi_alt_breakpoint=28000.0

max_bank=25.0

max_bank_acceleration=1.8

max_bank_velocity=3.00

max_throttle_rate=0.10

nav_proportional_control=9.00

nav_integrator_control=0.25

nav_derivative_control=0.00

nav_integrator_boundary=2.50

nav_derivative_boundary=0.00

gs_proportional_control=9.52

gs_integrator_control=0.26

gs_derivative_control=0.00

gs_integrator_boundary=0.70

gs_derivative_boundary=0.00

yaw_damper_gain = 0.0

Thank you for the information. I'll work my way through my aircraft inventory.

Thank you! The problem has been resolved using the information you kindly provided.