I have been following this thread on RCG: Important Firmware Update – ACCST D16 2.0.0 - ACCESS also affected, and I have serious concerns as to how this issue affects ArduPilot and Pixhawk.
The thread is quite long, but the gist is that FrSky receivers can go into a “lock out” mode and can cause “uncommanded” servo movement.
There is also some discussion about S.Bus that included a statement that, " With V2 FW FrSky combines 4 RF-frames into one SBUS string (containing 2 frames). The FL flag is set, if 2 clean frames cannot be found within the last 4 frames. According to FrSky, this is a request from Flight Controll Manufactures." (Taken from post #1074).
I have been using FrSky equipment for quite some time and I have never encountered this particular “bug.”
So, I’m wondering has anyone here seen this behavior? And I’m also wondering which "Flight Controll (sic) Manufactures made the previously quoted “request”?