Aviation safety issues and actions
Recommendation issued to: Pratt & Whitney Canada
|Date issued:||09 October 2007|
|Safety action status:||Closed - No Action|
|Background:||Why this Recommendation was developed|
The Australian Transport Safety Bureau recommends that Pratt & Whitney Canada consider requiring the removal of any PT6A series engine from service where there is evidence of an EDD event.
|Response from:||Pratt and Whitney Canada response|
Pratt and Whitney responded to this proposed safety recommendation (draft recommendation C) in the ATSB draft report by stating:
As stated above, the ATSB accepts P&WC's response and agrees that the starter-generator external spline is the most practical and effective method to determine if there has been an EDD event. However, the ATSB does not accept that continued operation of the engine following an EDD event is without risk. Additionally, it has been shown through this investigation that filter patch checks are not a reliable means to predict an engine failure following an EDD event. It is the ATSB's view that, where evidence of EDD is detected, the engine's continued reliability should be considered suspect. As such the ATSB has reworded and now formally issues safety recommendation R20070017.