Regional Jet 200 ER/LR (CRJ200)
Aircraft Equipment Problem Critical
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
First Officer was flying and was issued a crossing restriction. Immediately after pulling the thrust levers back to initiate the descent the First Officer saw that the Right Engine was unresponsive to thrust lever inputs. First Officer called for the QRH and the Captain ran the Jammed Thrust Lever QRH procedure. The Captain and the First Officer agreed to keep the Engine running until 10;000 feet and closer to ZZZ. The First Officer deployed Flight Spoilers to continue the descent because the Right Engine N1 was at 98 percent. The Captain kept the passengers and Flight Attendant informed of everything. Once level at 12;000 feet and complying with the crossing restriction the Captain completed the thrust reverser jammed QRH procedure and used the fire push switch to shut down the Right Engine. An emergency was declared and the ILS was requested to maximize the runway length. First Officer kept the PF role and landed the airplane safely. The Captain took controls and taxied to the gate. Passengers were deplaned without compromising safety. The flight crew attempted to swap the bleeds to the APU above 15;000 feet but the other crew member quickly noticed and prevented it. The flight crew with no guidance from the checklist attempted to 'test' the Thrust Lever by moving it forward increasing the N1 to 98 percent where it stayed.
Captain was the PNF and the First Officer was the PF. As the descent was initiated; it was discovered that the Right Thrust Lever was unresponsive to any commands; with the N1 displaying 97.5 percent. The thrust lever was moved forward and aft to verify unresponsiveness and the N1 increased to 98.3 percent to which the decision was made to not move the thrust lever any further without QRH compliance. The QRH was consulted; and since the engine was still producing power at a continuous level; the decision was made to not secure the engine until speed control would become an issue (i.e.; prior to 10;000 feet to comply with the 250 knot requirement). An emergency was declared with Approach; and the Right Engine was secured in compliance with the QRH procedure for 'Thrust Lever Jammed' at approximately 14;000 feet. A single engine landing was accomplished with emergency equipment standing by. The landing was uneventful; and the aircraft was taxied to Gate with no further assistance. All passengers deplaned normally with no major concerns noted by the Flight Attendant.
CRJ200 flight crew discovers that the right engine is unresponsive to thrust lever movement when attempting to retard thrust for descent.  An emergency is declared; the engine is shut down; and a single engine landing ensues.