ORD Arrival Anomaly

 - October 21, 2013, 12:20 PM

The NBAA has warned flight crews executing the TRTLL STAR into Chicago’s O’Hare International Airport to be alert for a system glitch that might command an aircraft’s FMS to descend to 4,000 feet at MONKZ when the aircraft should actually remain at 11,000 feet. The 4,000-foot altitude depicted is an MEA at MONKZ, not a crossing altitude.