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
