About 6 weeks ago whilst carrying out an A check on a 206 with the owners son in law. I found the thomas coupling bolts on the tail rotor drive shaft loose. This is the shaft from the oil cooler fan to the tail rotor drive shaft. This aircraft had been flown several times in this state including a flight by the chief pilot of the maintenance organisation,after annual inspection. This item is subjet to an AD and this had not been completed. The CAA have been investigating this incident so therefore no more to be said. Beware the B**T**Ds will get you if you depend on trust.
