The UH-60 mechanical controls incorporate a mixing unit that performs (among other forms of mixing) collective-to-yaw mixing that is a basic compensation (on a fixed ratio basis) for torque induced yaw. It was designed to work properly at 16825lbs, so at other weights the mix ratio is wrong. It obviously cannot correct for external disturbances.
This mixing cannot be disabled.
Basic UH-60 AFCS is composed of:
1. SAS is short term rate damping providing P/R/Y correction for disturbances like wind, turbulence, etc. SAS does not compensate for torque induced yaw. SAS has no inertial reference, so it only opposes a disturbance (it doesn't know what heading/attitude to return to).
2. FPS is long term stabilization like rudimentary A/P functions (airspeed, attitude, heading hold, etc). FPS incorporates inertial references and will allow a pilot to perform a UH-60 takeoff with his feet off the pedals.
A pilot can disable SAS and/or FPS.
With mechanical mixing and SAS (no FPS), a basic UH-60 can maintain takeoff heading within ~15 degrees without pilot pedal input. With FPS engaged, it improves to about +/-3 degrees.
This is from memory (so take with grain of salt).