Recommendation R20070016

Recommendation issued to: Pratt & Whitney Canada

Recommendation details
Output No: R20070016
Date issued: 09 October 2007
Safety action status: Closed - Action Taken
Background: Why this Recommendation was developed

Output text

Safety Recommendation

The Australian Transport Safety Bureau recommends that Pratt & Whitney Canada, in conjunction with the aircraft and starter-generator manufacturers, incorporate a suitable inspection of the starter generator gear shaft input coupling spline for any evidence of Electrical Discharge Damage (EDD), if the starter generator is replaced in order to rectify a reported engine starting or electrical generation defect.

Initial response
Date issued:
Response from: Pratt and Whitney Canada response
Response text:

Pratt and Whitney Canada response Pratt and Whitney responded to this proposed safety recommendation (draft recommendation B) in the ATSB draft report by stating:

This subject was extensively reviewed in the course of the earlier investigation of the EDD incidents. The decision taken at that time was that the engine gear has an internal spline, and as such, is very difficult to examine in-situ to arrive at a meaningful result. P&WC would support a recommendation that consideration be given to an AMM revision that would call for an inspection of the external spline of the starter-generator, as it is our understanding that this would be practical and effective.

ATSB comment:

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. As such the ATSB has reworded and now formally issues safety recommendation R20070016.

Last update 05 April 2012