Ha Ha ,
Guess what, on our 2nd 600s first 6 month/100 Hour one of the captive nuts (of which there are 4 which hold the bolts which hold the tailboom on)was stripped so only 3 M8 bolts holding tailboom on !!!! It seems the captive nuts are spliting if over tightened, then you cant change the captive nuts without deskinning part of the airframe!
I hadnt heard about the splits around the bolts, but I know that the slots in the tailboom are prone to cracking at the end of the slot!There has also been a mod to the tailboom around the bolt holes, it was a complete new tailboom part No. though I think, from memory Im sure ithad something to do with the holes in the tailboom having metal inserts or something.
It aint fallen off yet !!!!
Regards
Hover Bover.
PS
Hows the fadec Mr 600, all fixed !!!!!