What was found
PROPELLER SUBMITTED FOR OVERHAUL/COMPLIANCE WITH AD 89-26-08, OIL FILL MODIFICATION TO DETECT BLADE/HUB CRACKS. UPON PENETRANT INSPECTION OF BLADE, A 1.25 INCH LONG CRACK WAS DISCOVERED IN THE SECOND RETENTION THREAD. ALSO, THE PROPELLER HUB, S/N 685951, WAS FOUND WITH SEVERE EXTERNAL CORROSION. SUBMITTER STATED CAUSE OF CRACK UNKNOWN. RECOMMEND OPERATORS CHECK C/W AD 89-26-08.