What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
After landing, during taxi, the pilot acknowledged an issue with the powerplant, which was a turbo prop and was having fluctuation of the ng speed/percentage at flight idle. The pilot stopped the aircraft and started perfoming troubleshooting procedures by moving the fuel condition lever from low idle to high idle back to low idle. He could duplicate the issue but could not correct it. The pilot then decided to taxi to have maintnenace personnel look at the issue.
Approximately thirty seconds into the taxi, the engine began to roll back, he then engaged the ignition switch while the ng was above 50 percent. The engine continued to slow down. He then turned off the ignition and observed the black smoke coming from the exhaust.
Damage to powerplant was an internal overtempt to the compressor turbine wheel, discoloration of paint on engine cowling, heat shield discolored.
As the FAA filed it
AFTER LANDING, DURING TAXI, THE PILOT ACKNOWLEDGED AN ISSUE WITH THE POWERPLANT, WHICH WAS A TURBO PROP AND WAS HAVING FLUCTUATION OF THE NG SPEED/PERCENTAGE AT FLIGHT IDLE. THE PILOT STOPPED THE AIRCRAFT AND STARTED PERFOMING TROUBLESHOOTING PROCEDURES BY MOVING THE FUEL CONDITION LEVER FROM LOW IDLE TO HIGH IDLE BACK TO LOW IDLE. HE COULD DUPLICATE THE ISSUE BUT COULD NOT CORRECT IT. THE PILOT THEN DECIDED TO TAXI TO HAVE MAINTNENACE PERSONNEL LOOK AT THE ISSUE.
APPROXIMATELY THIRTY SECONDS INTO THE TAXI, THE ENGINE BEGAN TO ROLL BACK, HE THEN ENGAGED THE IGNITION SWITCH WHILE THE NG WAS ABOVE 50 PERCENT. THE ENGINE CONTINUED TO SLOW DOWN. HE THEN TURNED OFF THE IGNITION AND OBSERVED THE BLACK SMOKE COMING FROM THE EXHAUST.
DAMAGE TO POWERPLANT WAS AN INTERNAL OVERTEMPT TO THE COMPRESSOR TURBINE WHEEL, DISCOLORATION OF PAINT ON ENGINE COWLING, HEAT SHIELD DISCOLORED.
Other reports on N1058N · 2
Matched to the same aircraft by N-number and date.