What was found
(CAN) DURING INVESTIGATION FOR AN OIL LEAK ON THE NR 1 ENGINE, THE PROP WAS REMOVED. WITH THE PROP REMOVED A CRACK WAS FOUND INSIDE THE PROPELLER SHAFT (ROOT P/N 3111119-01). THE ENGINE WAS REPLACED. HAD THIS CRACK REMAINED UNDETECTED THE LIKELY RESULT WOULD BE A CATASTROPHIC FAILURE WITH POSSIBLE LOSS OF THE AIRCRAFT. ENGINE P/N PW120A, S/N 120442, TSN 39371, CSN 48445, TSO 8065, CSO7874. REDUCTION GEARBOX P/N 3104280-01, S/N 120360, TSN 42738, CSN 47764, TSO 1735, CSO 1732. IT WILL BE UP TO 3 MONTHS BEFORE THE ENGINE STRIP REPORT FROM THE REPAIR FACILITY IS AVAILABLE.