What was found
DURING AN ANNUAL INSP, PROPELLER & CRANKSHAFT PLUG REMOVED TO COMPLY WITH AD 98-02-08. CORROSION ON INSIDE OF CRANKSHAFT FROM PLUG SHOULDER .7500 - 1 INCH AFT. ACCORDING TO THE AD, AFTER INSIDE OF CRANKSHAFT HAS BEEN PAINTED IAW SB505 THERE IS NO LONGER ANY NEED TO INSPECT CRANKSHAFT FOR CORROSION SINCE SPECIAL PROCEDURE FOR DOING SO PREVENTS ANY CORROSION FROM OCCURRING. IN THIS CASE, IF FAILED TO DO SO. THERE IS APPROX 1800 HRS ON ENGINE SINCE OVERHAUL BY FACTORY & SUSPECT THAT THIS IS NOT AN ISOLATED CASE. PERFORMED A FLUORESCENT PARTICLE INSP WITH NO EVIDENCE OF CRACKS. RECOMMEND THAT EXAMINATION AT 500 HRS TIME IN SERVICE SINCE "PID" WAS DONE & AT EVERY 100 HRS THEREAFTER UNTIL MFG CAN COME UP WITH A BETTER SOLUTION.