Offshore oil helicopter operator Bristow Group is retrofitting all 44 of its helicopters with Rockwell Collins Tcas II systems. Working with the avionics manufacturer, Bristow has already retrofitted the Collins TTR-4000 Tcas II system on 24 of its helicopters. Within the next year Rockwell Collins is to install its next-generation TTR-4100, which adds traffic computer capability and enables ADS-B IN applications, on 20 of Bristow’s helicopters. Rockwell Collins’s Tcas II is certified for industry-standard “unknown vibration levels,” meaning it can be installed in any helicopter.