More airplanes must be inspected for cracks, including new areas

US aviation regulators are expanding mandatory inspections for certain ATR airplanes. This means more planes will need checks for cracks in their horizontal stabilizers, and inspectors will look at additional parts of the tail.

Aviation regulators found more planes had the same problem, and the problem was bigger than they first thought. This kind of expansion means the original fix was not enough. It also means more planes will be grounded for inspections, which costs airlines money.