On second eighty-nine, the red light flickered. On ninety, it turned a steady, calm green. The coordinates on the display snapped back into reality.
RNAV Standard Instrument Departures (SIDs) and Arrivals (STARs) , which require precise system alignment before takeoff. The "Review": Learning Curve vs. Capability User Experience Complexity ltn-92 manual
Based on the designation , this refers to the Litton (now Northrop Grumman) LTN-92 Inertial Navigation System (INS) . On second eighty-nine, the red light flickered