Chancellor 414A / C414
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor; Flight Crew Multiengine
Flight Crew Last 90 Days 10; Flight Crew Total 7200; Flight Crew Type 10
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Took Evasive Action; Flight Crew Executed Go Around / Missed Approach
Aircraft
While tracking the glideslope; it became clear the left engine MP (Manifold Pressure) was not changing with throttle movements. Rather than trying to deal with the problem while continuing the approach; I elected to cancel IFR; break off the approach; and circle north of the final approach course to take further action. I decided it would be safer to feather the engine and make a single engine landing than to attempt a landing with one engine producing partial power (~50%). We train for single engine landings; but we don't train for a stuck throttle.I [advised ATC] so ATC would clear any traffic and reduce the chance of a distraction and especially of having to go around on one engine. I rejoined the final approach course and landed without incident.I believe the problem was mechanical but I have not heard specifically what caused the engine to become unresponsive.The situation was greatly eased by being in VMC. I feel like I handled it pretty well and will handle it the same way if it happens again. However; in IMC it would have been much more challenging as the point at which the failure occurred was after radar service was terminated. I would have had to re-establish radar contact; negotiate re-sequencing for the approach; all while single engine and potentially in icing conditions. A suggestion is to incorporate similar kinds of real-life scenarios in training and recurrent curriculum.
C414 Captain reported left engine control problems that led to a single engine approach and landing.