A Summit Air Charter Avions de Transport Regional ATR-72-200, registration C-GJPY performing flight SMM-7142 from Diavik,NT to Yellowknife,NT (Canada) with no passengers and 3 crew, was descending towards Yellowknife when the crew observed fluctuating parameters for the left hand engine (PW124B) and shut the engine down as precaution. The aircraft continued for a safe landing in Yellowknife.
The Canadian TSB reported company maintenance is investigation the cause of the engine fluctuations.