Got the call this morning from Agusta Philly PSE. BT139-265 will supersede BT139-251, and PT I is same , but Pt II will require blade removal at 600 hrs and quarantined until investigation of latest Brazilian crash can determine if TR Blade is an issue. BT to be issued today, and would not be surprised to see AD's immediatly following. Unless you have blades with less than 600 hours, you will be sitting and waiting for replacements for a while I believe