What was found
ATL- FLT 554 - DURING CRUISE, NR 1 ENGINE, SN 4026, SPUN DOWN. SHUT DOWN ENGINE. FOUND ACCESSORY GEARBOX HAD INTERNAL MALFUNCTION. REPLACED ENGINE AND ENGINE OPERATION CHECK NORMAL. ENGINE TOTAL TIME: 49,589 HOURS, 33,419 CYCLES. CHECK C-1 - 3-7-95 - MCI. INVESTIGATION INTO ENGINE, SN 4026, GEARBOX FAILURE REVEALED A BUSHING, MFG PN 467572P3, ALLOWED GEAR TO MIGRATE CAUSING RAPID TOOTH WEAR RESULTING IN GEARBOX FAILURE. GEARBOX REPAIRED AND RETURNED TO SERVICE.