Aviation safety investigations & reports

Airbus Industrie A320-211 , VH-HYJ

Investigation number:
199901098
Status: Completed
Investigation completed

Summary

While cruising at flight level 390 (FL390) the number 1 engine failed. The crew made a PAN call to air traffic control (ATC) advising of the problem and requesting descent. A descent clearance was issued and the aircraft was given a direct track for final approach to runway 34L. An alert phase was declared by ATC. The pilot subsequently advised that no emergency existed and that a normal approach and landing was expected. As a precaution, emergency services were placed on a local standby. The aircraft subsequently landed safely.

An inspection of the engine by the operator found that both the high and low-pressure rotating assemblies were seized, and that there was light metal contamination on the chip detector. After removing and dismantling the engine, it was determined that the number 4 bearing had failed. The operator reported that the bearing had been in service for 21,004 hours since new, and 10,128 hours since the last visual inspection of that component. The chip detector had been inspected about 25 hours prior to the failure and found clean.

There have been two other similar reported failures in Australia. The engine manufacturer has reported that an improved bearing will be available shortly. The operator plans to review chip detector inspection periods in the interim.

Safety Action

The Bureau of Air Safety Investigation is currently investigating the underlying factors associated with number 4 bearing failures in CFM-56 engines.

Any recommendation issued as a result of this investigation will be published in the Bureau's Quarterly Safety Deficiency Report.

General details
Date: 18 March 1999   Investigation status: Completed  
Time: 1522 hours ESuT    
Location   (show map): 150 km SW Sydney, Aero.    
State: New South Wales    
Release date: 08 September 1999   Occurrence category: Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Airbus Industrie  
Aircraft model A320  
Aircraft registration VH-HYJ  
Serial number 142  
Type of operation Air Transport High Capacity  
Damage to aircraft Nil  
Departure point Melbourne, VIC  
Departure time 1542 hours ESuT  
Destination Sydney, NSW  
Last update 13 May 2014