Date: 202108
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Retractable Gear
Flight phase: Taxi
ATC / advisory: CTAF ZZZ
Reporter function: Pilot Flying
Human factors: Human-Machine Interface; Situational Awareness
Anomaly: Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Inflight Shutdown; General Maintenance Action; General Evacuated
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: I touched down at ZZZ and just like always; pushed my flap lever up to zero and reached over and pulled the condition lever to low idle. I was rolling on the runway and getting ready to turn around and back-taxi; but needed some momentum for the turn; so I reached down while looking outside and pushed the condition lever to high idle. When I did that; I heard it click through the gate. I looked down and noticed it was in low idle and the annunciator panel was lit up with several warning lights. At that point I realized that I had just pushed the condition lever from cut-off to low idle. I immediately pulled it back to cut-off; but the ITT temp was already up at the 1090 red line. Black smoke started rolling out of the exhaust. I then shifted my focus to getting passengers off the airplane. I turned around and announced that we had to get out of the airplane. There was a woman with children aboard. She started unbuckling the children. I grabbed the fire extinguisher and ran around to open the air stair door. I got the passengers off the airplane and to the side of the runway. I then went back to the airplane with the fire extinguisher; but by that time the black smoke had stopped rolling out of the exhaust. No flames were ever evident. I did not discharge the fire extinguisher. After making sure nothing was on fire; I retrieved the passengers' coats from the airplane. The agent arrived on his four-wheeler; along with a man in a pickup. The passengers got into the pickup while I contacted center to let them know there was a disabled airplane on the runway. With the help of the agent and the man in the pickup; we towed the airplane off the runway and on to the ramp. Once on the ramp; we unloaded the passengers' bags and the mail. The agent took charge of the mail. After a brief discussion with the agent about how best to secure the airplane; I started making phone calls to all the appropriate people (dispatch; maintenance; maintenance control; center to let them know the runway was clear). While talking with maintenance they had me try a dry motor of the engine. I could hear the starter motor attempting to turn and see a voltage drop; but the engine did not turn (Ng stayed at zero). When the [airport worker] showed up; he told me there were tie-downs behind the building at the end of the ramp. He had an aviation band radio in his truck; and we kept in constant contact on the CTAF frequency while he was towing me. He helped me tow the airplane to that end of the ramp. The tie-downs were very close to the airport fence; so I made sure he stopped well clear of the fence in a position from which we could push the plane back into the tie-down spot. It took us about 10 minutes of pushing and resting; but we got the airplane into the tie-down spot. As I was securing the airplane; maintenance control called. I told them I would give them a call back as soon as I had the plane secured. I secured it to the tie-downs with cargo straps. I installed the tail-stand; pitot covers; prop-tie; chocks; rudder lock; and cowl plugs; then closed the inertial separator. Dispatch diverted a pilot to come pick me up and once he arrived; I took the chocks from his airplane to chock the co-pilot side wheels as well. After securing the airplane I called maintenance control back. After briefing them about what happened on the runway and telling them about the results of the attempt at motoring the engine; they concluded they would initiate a plan to replace the engine. I took photos of the secured airplane and of the interior of the engine compartment on both sides. I saw no immediate evidence of fire or fire damage.




Synopsis: Pilot reported that after landing; while taxiing on the runway for a 180; the aircraft developed an engine problem causing evacuation of the aircraft on the runway.