AB206 in Indonesia 1968. An harmonic set up around the third stage compressor with an engine bleed that was open at start and gradually closed as engine spun up. Consistency of compressor blades turned to glass and shattered. This was in the cruise. Managed a safe landing next to a Kampong alongside a river, still have lower back problems. Aircraft back in the air about a month later when replacement engine arrived. The fault was known but the modified engines were all going to Viet Nam.