Cracked main gear trunnion — Boeing 737-838 fleet

Summary

During a heavy maintenance C-check at a Sydney MRO facility, a cracked main landing gear trunnion was discovered on a Qantas Boeing 737-838. The crack was detected by dye penetrant inspection. The aircraft had accumulated approximately 28,400 flight cycles. CASA and Boeing were notified immediately.

Investigation Findings (3)

1. 01Investigation is ongoing. Preliminary findings suggest fatigue crack propagation from a stress concentration at a machined relief.
2. 02Boeing is reviewing similar-age aircraft for comparable findings.
3. 03CASA is monitoring for fleet-wide implications.