Boeing 747 FFRATS Documentation

[chris341]

Hi all,

I am attempting to replicate a high fidelity simulation of the Boeing 747 classic in flight simulator. I have the autopilot and general flight model completed thanks to documentation from NASA/Boeing, the autopilot functions on all of the gains and formulas perfectly.

However, I have not been able to track down documentation on how the FFRATS autothrottle computers worked, including such information as the logic and gains used in computing a throttle setting from airspeed errors, damping values, etc. Does anyone happen to know where such documentation could be found?

Thanks!
Chris