To improve detection of surface damage and cracking of wheels fitted to the SCT class of locomotive, SCT has advised the following actions:
- Increase the level of visual inspections at wheel turning and during scheduled maintenance intervals, principally for evidence of impact damage.
- Perform ultrasonic testing at each wheel machining after travelling 400,000 km, principally for evidence of cracking .
- Where integral ultrasonic testing facilities are not available at wheel machining facilities, testing should start after midlife of the wheel when risk of wheel cracking increases.
The ATSB is satisfied that the action taken by SCT Logistics addresses this safety issue.