Incident Overview
On June 3, 2016, a Cessna 525 operated by Jet Story sp. z o.o. initiated a takeoff from runway 18 at Riga International Airport (EVRA), Latvia. During the takeoff roll, at approximately 70 knots, the flight crew observed high inter-turbine temperature (ITT) readings from the left engine. The temperature fluctuated between 830°C and 860°C over a period of five seconds, though the maximum temperature reached was not recorded. In response, the crew aborted the takeoff and the planned flight was canceled.
Subsequent Actions
Technical personnel, in consultation with the engine manufacturer, performed a borescope inspection of the left engine, which revealed no defects. Based on guidance from the engine manufacturer stating that the engine could be cleared for flight if the ITT had not exceeded 860°C, and after a successful T/S Bleed Air leak check, the aircraft was returned to service.
However, significant internal contamination of the left engine was later identified. Following instructions from the CAMO organization overseeing the aircraft, maintenance staff conducted an inspection and wash of the engine. This cleaning procedure resulted in a temperature reduction of approximately 30°C during subsequent takeoffs. It was also recommended that the right engine be cleaned as a preventive measure.
Probable Cause
Contamination of the engine interior.
Safety Actions
The operator discussed the event and its resolution with its technical staff to ensure awareness. Additionally, the operator considered purchasing cleaning nozzles for all aircraft types in its fleet to facilitate future engine washes. No safety recommendations were issued by the investigation commission.