Table 2–1. Master Failure Symptom Index (cont)

TM 1–1520–238–T–2 Change 5 2–31 Table 2–1. Master Failure Symptom Index (cont) Failure Symptom MOC Reference CDU CIRCUIT BREAKER (CB6) DOES NOT STAY CLOSED (PILOT ELEC PWR PANEL: BATT/EXT PWR SWITCH SET TO EXT PWR) TM 1–1520–238–T–6 CIRCUIT PROTECTION SYSTEM (DC ESSENTIAL BUS 3 – CPG STATION) CDU CIRCUIT BREAKER DOES NOT STAY CLOSED (AN/ASN–137) (ADC) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 (ADC) CDU CIRCUIT BREAKER DOES NOT STAY CLOSED (AN/ASN–137) (ADD) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 (ADD) CDU/DNS INTERFACE NOGO (MUX SWITCH TO SEC) (ADD) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM (ADD) CDU DISPLAY DOES NOT CHANGE TO NAV TOP LEVEL POWER ON PRESENT POSITION PAGE WITHIN 3 SECONDS (CDU: VAB NEXT TO DISPLAYED WORDS PWR OFF PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 CDU DISPLAY DOES NOT FREEZE DATA ON SCRATCH PAD WITH CURSOR POSITION UNDER FLASHING 5 (CDU: CLR FAB KEY PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 CDU DISPLAY LINE 6 HAS NOT CHANGED FROM MEMORY TO BACKUP (CDU: VAB NEXT TO DISPLAYED WORD ADMIN PRESSED THEN VAB NEXT TO DISPLAYED WORD BACKUP OFF PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 CDU DISPLAYS CDU/DNS INTERFACE NO–GO MESSAGE (CDU: FD/LS KEY PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 CDU DISPLAYS DNS RAM ERASED FD/LS INITIAL PAGE (CDU: VAB NEXT TO DISPLAYED WORDS PWR OFF PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137