RNING SYSTEM AND TAKEOFF CONFIGURATION WARNING AIRFRAME SYSTEM LIGHTS (REV. 4) Notes: REF AD 2013-02-05. AD 2013-02-05 TO PREVENT FAILURE OF THE FLIGHTCREW TO RECOGNIZE OPEN 06-WtR-2016 M: 18D: 7 MD 39-17326 AND REACT TO A VALID CABIN ALTITUDE WARNING HORN 4789 AIRFRAME Notes: REF SB 737-31A1332.