Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Instrument; Other Glider; Dispatcher
Flight Crew Last 90 Days 25; Flight Crew Total 7800; Flight Crew Type 2800
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Loss Of Aircraft Control
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Inflight Shutdown; Flight Crew Executed Go Around / Missed Approach; General Maintenance Action; General Flight Cancelled / Delayed
Aircraft; Procedure; Incorrect / Not Installed / Unavailable Part
On final approach to RWY (Runway) XXL at ZZZ; with throttle retarded; throttle control became disconnected from throttle arm on engine's fuel controller; whereupon engine went to full power with no further throttle control available. Notified tower and advised of intention to go around; join the pattern for left traffic to RWY XXL; and land with limited control of engine power or with no power. Performed go-around; normal traffic pattern; and landing while in continuous communication with the tower. On roll out; coasted onto [Taxiway] XX2 but did not clear the runway holding position markings. As the engine could not be safely restarted with throttle fully open; aircraft required towing from [Taxiway] XX2 to the ramp.On the ramp; opened right gill panel on lower cowling and observed that the threaded throttle control had fully backed out (that is; it had become fully unscrewed) from the rod end that connected it to the throttle arm on fuel controller.
Pilot reported loss of engine control; resulting in an In Flight Shut Down and a precautionary emergency landing.