TM 55-1520-240-TS Y M P T O MT A S KEDGE LIT PANEL DOES NOT LIGHT OR VARY18-3.4CDU MAL LAMP AND ALL LED SEGMENTS ARE18-3.5NOT ILLUMINATEDCDU DISPLAY NOT GO ALL18-3.6CHAPTER 18INSTALLED AVIONIC SYSTEMS TROUBLESHOOTINGCHAPTER OVERVIEWFAILURE SYMPTOM LIST (Continued)DOPPLER/GPS NAVIGATION SYSTEM (DGNS)S Y M P T O MT A S KGPS ALERT INDICATOR DOES NOT ILLUMINATE18-3.7PRESENT POSITION NOT DISPLAYED ON CDU18-3.8CDU DOES NOT DISPLAY DOWNLOAD WAYPTS18-3.9DURING WAYPOINT LOADINGS Y M P T O MINDICATIONS ON THE FOUR-LINE DISPLAYAND HSI ARE NOT THE SAMET A S K18.3.10GPS DOES NOT ZEROIZE18-3.11GPS HAVEQUICK TIMING NOT WORKING18-3.12Change 19 18-4.1
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