MSL MODE SEL COMMAND

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 8–293 8–1114 SIGNAL NAME: MSL MODE SEL COMMAND MEMORY LOCATION: 001437 MEMORY DATA BIT(S): 15–16 (BINARY) CONDITION: If the second digit displayed on HOD is 4 or 0=STBY If the second digit displayed on HOD is 5 or 1=NORM If the second digit displayed on HOD is 6 or 2=MANUAL If the second digit displayed on HOD is 7 or 3=RIPPLE SIGNAL FUNCTION: Monitors CPG missile mode selection. CPG must be in control for signal to be recognized. REMARKS: From CPG missile panel to RHE. PASS: If CONDITION corresponds to selected mode, go to paragraph 8–1115. FAIL: Location of fault: CPG missile panel, wiring from CPG missile panel to RHE, RHE. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 8–1115 SIGNAL NAME: MSL MODE MEMORY LOCATION: 001341 MEMORY DATA BIT(S): 14–16 (BINARY) CONDITION: If the second digit displayed on HOD is 0=STBY If the second digit displayed on HOD is 1=NORM If the second digit displayed on HOD is 2=MANUAL If the second digit displayed on HOD is 3=RIPPLE SIGNAL FUNCTION: Indicates RHE mode. REMARKS: From RHE to FCC. PASS: If CONDITION corresponds to selected mode, go to paragraph 8–1116. FAIL: Location of fault: replace RHE (TM 9–1427–475–20). 8–1116 SIGNAL NAME: CPG MSL TYPE COMMAND MEMORY LOCATION: 001437 MEMORY DATA BIT(S): 17–19 (BINARY) CONDITION: If first digit displayed on HOD is 1=LASER SIGNAL FUNCTION: Indicates type of missile selected by CPG. REMARKS: From CPG missile control panel to RHE. PASS: If CONDITION corresponds to selected missile, go to paragraph 8–1117. FAIL: Location of fault: CPG missile control panel, wiring from CPG missile control panel to RHE, RHE. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 8–1117 SIGNAL NAME: CPG MSL TYPE SW MEMORY LOCATION: 000413 MEMORY DATA BIT(S): 5 (BINARY) CONDITION: If the fifth digit displayed on HOD is 4, 5, 6, or 7=LASER SIGNAL FUNCTION: Indicates type of missile. REMARKS: From CPG missile control panel through CPG MRTU Type III to FCC. PASS: If CONDITION corresponds to selected missile, go to paragraph 8–1121. FAIL: Location of fault: CPG missile control panel, wiring from CPG missile control panel to CPG MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault (TM 9–1427–475–20).

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