TM 1–1520–238–T–3
14–16
Change 4
14–58 SIGNAL NAME:
CPG VIDEO INFO CONT (ACY) CPG INFO CTL (ACZ)
MEMORY LOCATION: 000657
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates CPG video information command.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if first digit displayed on HOD is 0, 1, 2, or 3: replace symbol generator
(TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–59 SIGNAL NAME:
CPG FOV BRACKET SIZE CONT (ACY) CPG FOV SYM CTL (ACZ)
MEMORY LOCATION: 000657
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates FOV bracket size.
REMARKS: From FCC to symbol generator.
PASS:
If first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–60.
FAIL: Location of fault: wiring from TADS to FCC. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–1).
14–60 SIGNAL NAME:
CPG FOV BRACKET SIZE (ACY) CPG FOV SYM SIZE (ACZ)
MEMORY LOCATION: 000657
MEMORY DATA BIT(S):
4–11
(BINARY)
CONDITION:
HOD displays TADS FOV limits at all times.
SIGNAL FUNCTION:
Displays four corner markers that define TADS field of view (FOV) limits.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if conditions are met: wiring from TADS to FCC. Troubleshoot wiring to isolate
fault (TM 9–1230–476–20–1).
FAIL: Location of fault: wiring from FCC to symbol generator, symbol generator. Troubleshoot wiring
to isolate fault (TM 9–1230–476–20–1).
14–61 SIGNAL NAME:
CPG HDG CONT
MEMORY LOCATION: 000660
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates CPG heading.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–62.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–62 SIGNAL NAME:
CPG HDG
MEMORY LOCATION: 000660
MEMORY DATA BIT(S):
4–15
(SCALAR)
CONDITION:
Displays CPG heading on HOD. Monitor HOD; memory location should indicate
negative for 180 to 360 degrees and positive for 000 to 180 degrees. Indicates CPG
heading on HOD.
SIGNAL FUNCTION:
Indicates aircraft magnetic heading.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if CONDITION is met: replace symbol generator (TM 11–1520–238–23–2).
FAIL: Location of fault: refer to Chapter 6, paragraph 6–15.
