PYLON POS (ACY) PYLON POS AID (ACZ)

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 Change 4 11–5 11–10 SIGNAL NAME: PYLON POS (ACY) PYLON POS AID (ACZ) MEMORY LOCATION: 001465 MEMORY DATA BIT(S): 4–19 (SCALAR) CONDITION: Monitor HOD while using the PYLON ACTG SW; memory location response should increase when up (flight stow) is selected and decrease, then go negative when down (ground stow) is selected. SIGNAL FUNCTION: Indicates pylon position to RHE. REMARKS: From FCC to RHE. Pylon elevation positioning data. PASS: If CONDITION has been met, go to paragraph 11–11. FAIL: Location of fault: wiring from external stores elevation controller to pylon actuator controller. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 11–11 SIGNAL NAME: PYLN 1 POS (ACY) P1 POSITION (ACZ) MEMORY LOCATION: 001655 MEMORY DATA BIT(S): 4–19 (SCALAR) CONDITION: Monitor HOD while using the PYLON ACTG SW; memory location response should increase when up (flight stow) is selected and decrease, then go negative when down (ground stow) is selected. SIGNAL FUNCTION: Indicates pylon 1 position. REMARKS: From pylon actuator controller (PAC) 1 through LH outboard (OUTBD) MRTU Type II to FCC. Pylon 1 elevation positioning data. PASS: If CONDITION has been met, go to paragraph 11–12. FAIL: Location of fault: external stores elevation controller, wiring from external stores controller to pylon actuator controller 1, pylon actuator controller 1, wiring from pylon actuator controller 1 to LH OUTBD MRTU Type II, LH OUTBD MRTU Type II. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). 11–12 SIGNAL NAME: PAC 1 STAT MEMORY LOCATION: 001654 MEMORY DATA BIT(S): 4–19 (SCALAR) CONDITION: (None) SIGNAL FUNCTION: Generates PYLN ACTUATOR CONTROLLER NO–GO LT OUTBD FD/LS message. REMARKS: From PAC through LH OUTBD MRTU Type II to FCC. PASS: If sixth digit on HOD is 0, go to paragraph 11–13. FAIL: Location of fault: pylon actuator controller 1, pylon actuator controller 1, wiring from pylon actuator controller 1 to LH OUTBD MRTU Type II, LH OUTBD MRTU Type II. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2). 11–13 SIGNAL NAME: PYLN 1 STAT (ACY) P1 COM STAT (ACZ) MEMORY LOCATION: 001434 MEMORY DATA BIT(S): 19 (BINARY) CONDITION: (None) SIGNAL FUNCTION: Generates PYLON NO GO FD/LS message. REMARKS: From FCC to RHE. Pylon 1 status to RHE. PASS: If first digit on HOD is 0, 2, 4, or 6, go to paragraph 11–27. FAIL: Location of fault: replace RHE (TM 9–1427–475–20).

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