CPG ACQ SEL SW - TM-1-1520-238-T-3

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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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).

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