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

TM 1–1520–238–T–2 2–24 Table 2–1. Master Failure Symptom Index (cont) Failure Symptom MOC Reference BACKUP DOES NOT CHANGE TO BACKUP OFF AND AFTER 3 SECONDS NAV TOP LEVEL PWR ON PRESENT POSITION PAGE IS NOT DISPLAYED WITH THE WORD MEMORY ON DISPLAY LINE 6 (CDU: NEXT TO DISPLAYED WORD BACKUP PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 BACKUP OFF DOES NOT CHANGE TO BACKUP ON AND CDU DOES NOT DISPLAY NAV TOP LEVEL POWER ON PRESENT POSITION PAGE (CDU: NEXT TO DISPLAYED WORDS BACKUP OFF PRESSED) TM 11–1520–238–23–2 DOPPLER NAVIGATION SYSTEM (DNS) AN/ASN–137 BBC IN CONTROL FD/LS NONFUNCTIONAL POSITION APPEARS ON HOD (CPG FCP: MUX SWITCH SET TO PRI) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM BBC IN CONTROL FD/LS NONFUNCTIONAL POSITION DOES NOT APPEAR ON HOD (CPG FCP: MUX SWITCH SET TO SEC) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM BBC IN CONTROL FD/LS NONFUNCTIONAL POSITION DOES NOT APPEAR ON HOD AND STANDBY (FLASHING) APPEARS ON HOD (CPG FCP: MUX SWITCH SET TO SEC AND CPG CIRCUIT BREAKER PANEL NO. 1: FC FCC DC CIRCUIT BREAKER CLOSED) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM BBC IN CONTROL FD/LS NONFUNCTIONAL POSITION DOES NOT APPEAR ON HOD (CPG FCP: MUX SWITCH SET TO SEC AND PRI BUS DETACHED) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM BBC IN CONTROL FD/LS NONFUNCTIONAL POSITION REMAINS ON HOD (CPG FCP: MUX SWITCH SET TO PRI) TM 9–1230–476–20–2 MULTIPLEX SUBSYSTEM BINDING OR CHATTERING OCCURS (PILOT CYCLIC STICK: FORCE TRIM SWITCH SET TO OFF AND FORE AND AFT MOVEMENT APPLIED) TM 1–1520–238–T–7 FLIGHT CONTROL SYSTEM