P4M3 UNLATCH INDICATE

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 8–256 Change 4 8–971 SIGNAL NAME: P4M3 UNLATCH INDICATE MEMORY LOCATION: 002051 MEMORY DATA BIT(S): 16 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates to operator when a missile is unlatched. REMARKS: From launcher through right outboard MRTU Type II to FCC for display. PASS: If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 8–972. FAIL: Location of fault: right outboard launcher, wiring from right outboard launcher to right outboard MRTU Type II, right outboard MRTU Type II. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 8–972 SIGNAL NAME: P4M3 UNLATCH INDICATE MEMORY LOCATION: 002074 MEMORY DATA BIT(S): 16 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Indicates to operator when a missile is unlatched. REMARKS: From FCC through right outboard MRTU Type II to launcher. PASS: If second digit displayed on HOD is 0, 2, 4, or 6, refer to failure symptom index and next failure symptom paragraph. FAIL: Location of fault: right outboard MRTU Type II, wiring from right outboard MRTU Type II to FCC. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2). 8–973 SIGNAL NAME: P4M3 UPPER LOWER DISPLAY STATUS (ACY) P4M3 PRIORITY IND (ACZ) MEMORY LOCATION: 001360 MEMORY DATA BIT(S): 16 (BINARY) CONDITION: If the second digit displayed on HOD is 0, 2, 4, or 6=UPPER If the second digit displayed on HOD is 1, 3, 5, or 7=LOWER SIGNAL FUNCTION: Indicates to operator when a selected missile has been assigned to upper or lower channel. REMARKS: From RHE to FCC for display. PASS: If CONDITION corresponds to selected channel, go to paragraph 8–974. FAIL: Location of fault: replace RHE (TM 9–1427–475–20). 8–974 SIGNAL NAME: P4M3 TYPE STATUS DISPLAY (ACY) P4M3 TYPE (ACZ) MEMORY LOCATION: 001360 MEMORY DATA BIT(S): 17–19 (OCTAL) CONDITION: If the first digit displayed on HOD is 0=NONE If the first digit displayed on HOD is 1=TACTICAL LASER If the first digit displayed on HOD is 4=UNIDENTIFIED If the first digit displayed on HOD is 5=TRAINING LASER SIGNAL FUNCTION: Provides type of missile data for display to operator. REMARKS: From RHE to FCC for display. PASS: If CONDITION on HOD corresponds to installed type of missiles, go to paragraph 8–975. FAIL: Location of fault: RHE, wiring from RHE to ECSP, ECSP. Troubleshoot wiring to isolate fault (TM 9–1427–475–20).

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