Determine and eliminate the root cause for the flameout tendency of PW305A engine

Pratt & Whitney Canada, the engine manufacturer, states in their report that while the abovementioned throttle lever movement may cause an in-flight flameout on a PW305A engine, they consider it very remotely possible. They also state that the possibility of a dual in-flight flameout is considered very remote to improbable. The analysis did not speculate as to the cause of the flameout tendency.

Safety Investigation Authority Finland recommends that Pratt & Whitney Canada continue the analysis of PW305A engine control units so as to determine and eliminate the root cause of the detected flameout tendency. It would be desirable if Transport Canada, as the issuer of the engine’s type certificate, would contribute to this process. Safety Investigation Authority Finland further recommends that Transport Canada require the engine manufacturer to determine the root cause for the flameout tendency, and to propose the corrective action in eliminating the flameout tendency.

Pratt & Whitney Canada, the engine manufacturer, states in their report that while the abovementioned throttle lever movement may cause an in-flight flameout on a PW305A engine, they consider it very remotely possible. They also state that the possibility of a dual in-flight flameout is considered very remote to improbable. The analysis did not speculate as to the cause of the flameout tendency.