P4M2 UNLATCH INDICATE

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 Change 4 8–241 8–912 SIGNAL NAME: P4M2 UNLATCH INDICATE MEMORY LOCATION: 002051 MEMORY DATA BIT(S): 17 (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 first digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 8–913. 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). 8–913 SIGNAL NAME: P4M2 UNLATCH INDICATE MEMORY LOCATION: 002074 MEMORY DATA BIT(S): 17 (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 first digit displayed on HOD is 0, 1, 2, or 3, 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, FCC. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2). 8–914 SIGNAL NAME: P4M2 UPPER LOWER DISPLAY STATUS (ACY) P4M2 PRIORITY IND (ACZ) MEMORY LOCATION: 001357 MEMORY DATA BIT(S): 8 (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 8–915. FAIL: Location of fault: replace RHE (TM 9–1427–475–20). 8–915 SIGNAL NAME: P4M2 TYPE STATUS DISPLAY (ACY) P4M2 TYPE (ACZ) MEMORY LOCATION: 001357 MEMORY DATA BIT(S): 9–11 (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 corresponds to installed type of missiles, go to paragraph 8–916. 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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