Boeing (BA) 777 aircraft engines can ice up and stop working. The engines in question are made by Rolls-Royce, and although the problem is very rare, it is dangerous. The 777 is used for very long trips, often over oceans. According toThe Wall Street Journal, "The FAA rejected recommendations by the National Transportation Safety Board to order affected Boeing 777 operators to swiftly replace parts on at least one of the two engines on each aircraft."
The decision is an example of how commercial issues often trump safety. At least 130 777s would be affected by the part replacement program, and right now there are not enough parts to go around to fix all the engines. The FAA is allowing airlines to fly the 777 long distances until January 2011.