NTSB announced that its direct final rule to narrow reporting requirement in 49 C.F.R. § 830.5(a)(10) concerning certain resolution advisories is now effective. Operators are now only required to report Airborne Collision and Avoidance System resolution advisories issued when an aircraft is being operated on an instrument flight rules flight plan and compliance with the advisory is necessary to avert a substantial risk of collision between two or more aircraft.