Originally Posted by
ironbutt57
at a previous employer we had the elevator feel system freeze due to leaking toilet moisture, and the crew were unable to move the elevators (both columns) during initial level off arriving at destination, they used the stabilizer, after a short while the system unfroze due to warmer air and the airplane returned to ops normal...happened to only one aircraft, twice..system was repaired, never happened again..
I don't know about the BCF, but on the BDSF the lav system is replaced by a stand-alone unit on in right side of the supernumeraries area which has a large diam pipe running down to a service panel on the fwd right side of the lower fuselage.
There is no way water/waste could get near the jack
I assume the BCF has a similar system