Recommendation R20040088

Recommendation issued to: Federal Aviation Administration (FAA)

Recommendation details
Output No: R20040088
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 BO/200400726 for details.

Output text

Safety Recommendation

The Australian Transport Safety Bureau recommends that the US Federal Aviation Administration review Pratt & Whitney PW4000 engine maintenance procedures for ensuring the integrity of high pressure compressor variable stator vane synchronizing ring pins, to ensure that they adequately address and manage the potential for loss of vane arm pin retention.

Initial response
Date issued:
Response from: Federal Aviation Administration (FAA)
Action status: No Response
Response text:
Last update 01 April 2011