Thank's for that. Tailplane failure is certainly now looked on as the most likely cause of the Viscount accident. As I suspected, the Irish investigation was not as thorough as one that might have been undertaken by the UK's AAIB. In addition, bad political feeling between Britain and Ireland during that period of time certainly didn't help matters - although I did see in the report that the Irish investigation team availed themselves of assistance from the RAF's Institute of Aviation Medicine.