Citation V/Ultra/Encore (C560)
Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
Air Traffic Control Provided Assistance; Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft
While level at 40;000 feet we are given a descent to FL340. The Captain chose vertical speed on the flight director and shortly thereafter we received a pitch trim malfunction. The Captain disconnected the autopilot attempted to trim the airplane; then put the autopilot back on and shortly thereafter received another pitch trim malfunction. Then realized that the pitch trim was possibly frozen. We took out the corresponding checklist to run the JAMMED PITCH TRIM item checklist. We continued descending as we continued to proceed with the 'Jammed' checklist. At about 24;000 feet we realized that it was actually frozen and decided to continue. We stated the nature of our problem ATC was very helpful and we received vectors to our destination because we were within a hundred miles. The weather was marginal VFR (1000 overcast; 10 miles visibility). As we descended to 4000 feet preparing for our approach the outside air temperature had warmed to 16 degrees C. After a couple minutes at 4000 feet the pitch trim unfroze; and the trim appeared to be 100% functional. We continued and landed without any incident.
CE560XLS First Officer reported encountering a likely frozen pitch trim anomaly on descent. Pitch trim returned to normal operation when they descended to warmer temperatures.