Recommendation R20040086

Recommendation issued to: Civil Aviation Authority of Singapore

Recommendation details
Output No: R20040086
Date issued: 15 March 2005
Safety action status:

Maintenance and repair involving the removal and refit of the variable stator vane levelling arm pins to the Pratt & Whitney PW4000 engine. This procedure involves the flaring of the pins for retaining in the synchronising ring backed up by a service bulletin edict to tack weld the pins to the ring. These procedures appear not to be successful in accomplishing the desired retention of the pins.

Refer to ASOR BO/200400726 for details.

Output text

Safety Recommendation

The Australian Transport Safety Bureau recommends that the Civil Aviation Authority of Singapore liaises with Pratt & Witney's Singapore based overhaul joint venture to review the process for accomplishing the ring pin flaring and compliance with the service bulletin PW4ENG72432 to ensure the processes are appropriate and in accordance with the service bulletin.

Initial response
Date issued:
Response from: Civil Aviation Authority of Singapore
Response text:
Last update 01 April 2011