TM 1–1520–238–T–3
7–16
Change 4
7–56 SIGNAL NAME:
CPG ACQ SEL SW
MEMORY LOCATION: 001074
MEMORY DATA BIT(S):
7–9
(OCTAL)
CONDITION:
If the fourth digit displayed on HOD is 0 or 1=PHS
(Chapter 7, paragraph 7–38)
If the fourth digit displayed on HOD is2 or 3=FXD
(Chapter 10, paragraph 10–30)
If the fourth digit displayed on HOD is 4 or 5=TGT
(Chapter 16, paragraph 16–23)
If the fourth digit displayed on HOD is 6 or 7=NAV
(Chapter 20, paragraph 20–37)
If the fifth digit displayed on HOD is 1, 3, 5, or 7=GHS
(Chapter 7, paragraph 7–56)
If the fifth digit displayed on HOD is 1, 3, 5, or 7 and the fourth digit displayed on HOD
is 2 or 3=MSL SKR (Chapter 8, paragraph 8–10)
If the fifth digit displayed on HOD is 1, 3, 5, or 7 and the fourth digit displayed on HOD
is 4 or 5=TADS (Chapter 15, paragraph 15–6)
SIGNAL FUNCTION:
Indicates position of ACQ SEL switch.
REMARKS: From CPG FCP through LH FAB MRTU Type I to FCC.
PASS:
If CONDITION displayed on HOD corresponds to CPG ACQ SEL switch position, refer to
appropriate chapter and paragraph as listed under CONDITION.
FAIL: Location of fault: CPG FCP, wiring from CPG FCP to LH FAB MRTU Type I, LH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
7–57 SIGNAL NAME:
CPG LOS STATUS (ACY) CPG LOS INVALID (ACZ)
MEMORY LOCATION: 001571
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors CPG LOS status.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If first digit on HOD is 1, 3, 5, or 7, go to paragraph 7–43.
FAIL: Location of fault: go to paragraph 7–58.
7–58 SIGNAL NAME:
CPG I DIR COS
MEMORY LOCATION: 001575
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor CPG I direction cosine signal polarity on HOD as TADS is moved left (–) or
right (+) relative to TADS fixed forward position (0).
SIGNAL FUNCTION:
Generates CPG IHADSS I direction cosine.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If condition is met go to paragraph 7–59.
FAIL: Location of fault: SSU, wiring from SSU to SEU, SEU, wiring from SEU to RH FAB MRTU Type
I, RH FAB MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
