Skyhawk 172/Cutlass 172
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 111; Flight Crew Total 661; Flight Crew Type 661
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
During a training flight in the local traffic pattern the student pilot reported that he was unable to retard the throttle. I took control of the aircraft and too found that the throttle would not retard lower than approximately 2300 RPM. I contacted ATC; [received priority]; and was able to slow the plane by leaning the mixture. Landing was uneventful but the engine stopped prior to being able to clear the active runway and required tow.
Flight Instructor reported engine became uncontrollable; requiring a return to the airport.