Super King Air 200
Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Air Traffic Control Military 1.5; Flight Crew Last 90 Days 170; Flight Crew Total 12092; Flight Crew Type 735
Training / Qualification; Troubleshooting; Workload
Aircraft Equipment Problem Critical
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
This flight was being conducted as a training flight. I the instructor initiated a shutdown of the right engine to: 1. Assess the trainees actions in identifying and securing the correct engine and 2. To demonstrate to the Applicant the proper technique for restarting an engine at this altitude and that it may not even be possible to do a restart at this altitude. He demonstrated correct and proper technique. Upon his completion I moved the propeller control out of the Feather Position to prevent it from feathering and then moved the Condition Lever to the LOW Idle position. I've demonstrated this exercise dozens of times successfully to numerous trainees with non eventful results. This time; when I moved the condition lever to the LOW Idle position there was an almost immediate 'bang' from the engine and debris began exiting the exhaust stack. I immediately moved the condition lever to the IDLE Cutoff position; feathered the propeller and we secured the engine according to the engine shutdown checklist. We declared an emergency and landed uneventfully.
A BE20 engine failed after being shutdown for training at FL270; then restarted at which time a bang was heard followed by debris exiting the engine.