TM 1–1520–238–T–3 27–4 Change 5 27–14 SIGNAL NAME: RESERVED MEMORY LOCATION: 003003 MEMORY DATA BIT(S): 14–12 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates serial digital error. REMARKS: From FCC to EGI. PASS: If second and third digits displayed on CDU are 0, go to paragraph 27–15. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1). 27–15 SIGNAL NAME: SUBSYSTEM FLAG MEMORY LOCATION: 003003 MEMORY DATA BIT(S): 17 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates subsystem fault. REMARKS: From FCC to EGI. PASS: If first digit displayed on CDU is 0, go to paragraph 27–16. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1). 27–16 SIGNAL NAME: TERMINAL FLAG MEMORY LOCATION: 003003 MEMORY DATA BIT(S): 19 (BINARY) CONDITION: (None). SIGNAL FUNCTION: Indicates terminal fault. REMARKS: From FCC to EGI. PASS: If fourth digit displayed on CDU is 0, go to paragraph 27–17. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1). 27–17 SIGNAL NAME: INS UVW VEL VALID MEMORY LOCATION: 002643 MEMORY DATA BIT(S): 4 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates INS velocity is valid. REMARKS: From EGI to FCC. PASS: If sixth digit displayed on CDU is 1, go to paragraph 27–18. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1). 27–18 SIGNAL NAME: INS ATTITUDE VALID MEMORY LOCATION: 002643 MEMORY DATA BIT(S): 5 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates INS attitude is valid. REMARKS: From EGI to FCC. PASS: If fifth digit displayed on CDU is 4, 5, 6 or 7, go to paragraph 27–19. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1). 27–19 SIGNAL NAME: INS HEADING VALID MEMORY LOCATION: 002643 MEMORY DATA BIT(S): 6 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates INS heading is valid. REMARKS: From EGI to FCC. PASS: If fifth digit displayed on CDU is 6 or 7, go to paragraph 27–20. FAIL: Location of fault: Replace EGI (TM 11–1520–238–23–1).