FAILURE SYMPTOM LIST GLOBAL POSITIONING SYSTEM

CHARGE INDICATOR LAMPS ON ONE OR MORE EMERGENCY EXIT LIGHTS DO NOT COME ON WHEN 17-1.8 SWITCH IS AT DISARM (Continued) - TM-55-1520-240-T-3_1069

FAILURE SYMPTOM LIST (Continued) - TM-55-1520-240-T-3_1072

TM-55-1520-240-T-3 CH-47D Heilcopter Manual
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TM 55-1520-240-T CHAPTER 18 INSTALLED AVIONIC SYSTEMS TROUBLESHOOTING CHAPTER OVERVIEW Chapter 18 contains procedures for Installed Avionic Systems troubleshooting. Each avionic system and failure symptom is listed below. Included in this chapter are locations and views of all electrical connectors, receptacles, relays, and ground connections for each Installed Avionic System. Refer to TM 55-1520-240-23 for required Avionic System maintenance procedures. SYSTEM PARA GLOBAL POSITIONING 18-1 ALTITUDE VOICE WARNING SYSTEM 18-2 (RADAR ALTIMETER DOPPLER/GPS NAVIGATION SYSTEM (DGNS 18-3 HF LIAISON FACILITY 18-4 FAILURE SYMPTOM LIST GLOBAL POSITIONING SYSTEM S Y M P T O M TASK S Y M P T O M TASK GPS DISPLAY DOES NOT TURN ON OR VARY 18-1.4 GPS SYSTEM TRACKS LESS THAN FOUR 18-1.7 WITH CDU BRT CONTROL SATELLITES AND ESTIMATED POSITION ERROR (EPE) IS NOT WITHIN LIMITS OF THE SYSTEMS FIGURE OF MERIT (FM) NO MOVEMENT OF GPS RCVR TIME TOTALIZING METER GPS CDU DISPLAYS “FAIL” MESSAGE 18-1.5 18-1.6 DATA LOADER MODULE INFORMATION DOES NOT LOAD INTO GPS SYSTEM BUT NO ERROR MESSAGE APPEARS ON CDU 18-1.8 KYK-13 KEY LOADING DISCREPANCIES 18-1.9 S Y M P T O M GPS ALERT INDICATOR DISCREPANCIES T A S K 18-1.10 PILOT/COPILOT HSI DISCREPANCIES 18-1.11 GPS SYSTEM WILL NOT ZEROIZE 18-1.12 GPS SYSTEM WILL NOT RETAIN LOADED DATA AFTER AIRCRAFT POWER IS 18-1.13 REMOVED GO TO THE NEXT PAGE Change 21 18-3

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