NTSB Issues Cessna Service Letter
After three Cessna Aircraft Company (Cessna) 560XL airplanes experienced loss of rudder control after ice built up inside the tailcone, it was established that water can collect and freeze inside the tailcone.
Consequently Cessna service letter 560XL-53-08 was written.
The letter is available here:
http://www.ntsb.gov/recs/letters/2011/A-11-016.pdf