PLT I BEAM AZ

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 12–11 12–31 SIGNAL NAME: PLT I BEAM AZ MEMORY LOCATION: 000715 MEMORY DATA BIT(S): 4–15 (SCALAR) CONDITION: Monitor HOD; movement of the I BEAM to the left should show a decreasing negative number (1 in the sixth digit) and movement of the I BEAM to the right of the aircraft should show a positive increasing number (0 in the sixth digit) SIGNAL FUNCTION: Indicates I BEAM azimuth (pylon angle) position relative to aircraft. REMARKS: From FCC to symbol generator. PASS: If display on HOD corresponds to selected LOS position, go to paragraph 12–32. FAIL: Location of fault: wiring from DEU to RH FAB MRTU Type I, RH FAB MRTU Type I, for IHADSS related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU, TEU, wiring from TEU to CPG MRTU Type III, CPG MRTU Type III, for TADS related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU, TEU, wiring from TEU to LH FAB MRTU Type I, LH FAB MRTU Type I, wiring from TADS/PNVS Turret Assembly to PEU, for PNVS related discrepancies. Troubleshoot wiring to isolate fault. Refer to TM 9–1270–221–23 for integrated helmet and display sight system (IHADSS), TM 1–5855–265–T for pilot night vision sensor (PNVS), or TM 1–1270–476–T for target acquisition designation sight (TADS) related discrepancies. 12–32 SIGNAL NAME: PLT I BEAM TYPE MEMORY LOCATION: 000715 MEMORY DATA BIT(S): 18 (BINARY) CONDITION: If the first digit is 0, 1, 4, or 5=SOLID If the first digit is 2, 3, 6, or 7=OPEN SIGNAL FUNCTION: Selects solid or open I beam. REMARKS: From FCC to symbol generator. PASS: If first digit displayed on HOD corresponds to selected I BEAM, go to paragraph 12–33. FAIL: Location of fault: wiring from DEU to RH FAB MRTU Type I, RH FAB MRTU Type I, for IHADSS related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU, TEU, wiring from TEU to CPG MRTU Type III, CPG MRTU Type III, for TADS related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU, TEU, wiring from TEU to LH FAB MRTU Type I, LH FAB MRTU Type I, wiring from TADS/PNVS Turret Assembly to PEU, for PNVS related discrepancies. Troubleshoot wiring to isolate fault. Refer to TM 9–1270–221–23 for integrated helmet and display sight system (IHADSS), TM 1–5855–265–T for pilot night vision sensor (PNVS), or TM 1–1270–476–T for target acquisition designation sight (TADS) related discrepancies.

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