This is from the Aviation 2/7 Facebook page:
The FAA has issued an urgent Airworthiness Directive (AD) for nearly 600 CRJ regional jets (including CRJ-550, -700, -900, and -1000 models) due to the risk of horizontal stabilizer failure. The directive, effective November 20, is based on reports—initially by Transport Canada—of missing or loose bolts on the horizontal stabilizer’s anti-yaw fitting block. According to the FAA, this hardware failure could lead to the loss of the stabilizer and consequent loss of control, especially when combined with a bird strike or gust loading. Operators must now perform detailed torque checks and replace any faulty hardware before the next flight, followed by repetitive inspections every 2,200 flight hours. The estimated compliance cost is about $510 per aircraft.