after the replacement there was a difference in the shaking of the right engine and the left engine, which was deemed by investigators as unreliable. Investigators stated that the replacement was improperly installed by crews. Further investigation revealed that the right engine failure was caused by a malfunction on the aircraft's fuel supply system. The fuel lines to the combustion chamber was cut off, causing it to fail. This was caused by a malfunction on the aircraft's electronic engine control (known as SAY-2000) The SAY-2000 didn't work as expected, in which the system caused a 17 seconds delay on the feathering of the aircraft. After 17 seconds, the feather pump was switched on and the aircraft's system finally detected the failing right engine and began the propeller feathering. Investigators noted that the flight crews immediately detected the right engine failure approximately 5 seconds after the failure, whereas the warnings occurred only 14 seconds later. Reports on previous studies on the Antonov An-140's SAY-2000 system revealed that there had been some modifications on the software of the system. This was due to the fact that previous occurrences revealed that the system had caused numerous engine failures with a rate that was above the acceptable level. The modifications were not effective as the failure rate was not reduced to acceptable level. Further findings The investigation also revealed that the aircraft had been overloaded. This was due to the Aircraft Flight Manual (AFM) that was not clear and was deemed as confusing by investigators. It was suspected that the AFM confused the pilot during their calculations on the maximum take-off weight, which caused an over-estimation on the weight by 190 kg. The aircraft's fuel was also 500 kg more than the required amount. The investigation also revealed that the aircraft didn't take off at the supposed take-off speed. Instead of taking off at the supposed 224 km/h, the crew elected to take off at a speed of 219 km/h. Shortly after the right engine failure, the pilots were supposed to press the right engine feather button to feather the right propeller. The pilots had discussed about the failure just 5 seconds after it began malfunctioning. 9 seconds after the failure, the pilot flying had re-emphasized on the failure. However, neither pilots pushed the right propeller feather button. 14 seconds after the right engine failure, the co-pilot reported the engine failure to the Air