What was found
ON START UP, ROTORS BEGAN TURNING. A LOUD BANG HEARD. START ABORTED. INSPECTION REVEALED T/R SHAFT SEGMENT TWISTED AT NR 5 SHAFT. FREEWHEEL SLIPPED MOMENTARILY AND RE-ENGAGED. TRANSMISSION SENT TO FRANCE FOR DISASSEMBLY. SPRING IN FREEWHEEL FOUND BROKEN. ENGINE INSPECTED BY MANUFACTURE. ALL SHAFTING REPLACED. GEARBOXES IN T/R SYSTEM INSPECTED, FUSELAGE AND T/BOOM VISUALLY AND NDT INSPECTED, HEAD AND M/R BLADES INSPECTED (VISUALLY & NDT). TRANSMISSION, MOUNTS VISUALLY AND NDT INSPECTED. ALIGNMENT CHECKS OF A/F AND ENGINE MOUNTS CONDUCTED.