TM 1–1520–238–T–3
Change 4
15–53
15–229 SIGNAL NAME: AUTO GYRO ALIGN COMPLETE
MEMORY LOCATION: 001135
MEMORY DATA BIT(S): 15 (BINARY)
CONDITION: (None)
SIGNAL FUNCTION: Indicates TADS auto gyro alignment is complete.
REMARKS: From TEU through LH FAB MRTU Type I to FCC.
PASS: Location of fault if second digit on HOD is 2, 3, 6, or 7; troubleshoot TEU
(TM 1–1270–476–T).
FAIL: Location of fault: TEU, wiring from TEU to LH FAB MRTU Type I, LH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–230 SIGNAL NAME: ORT TV TO TEU (ACY) TV SELECT SW TST (ACZ)
MEMORY LOCATION: 001252
MEMORY DATA BIT(S): 19 (BINARY)
CONDITION: (None)
SIGNAL FUNCTION: Indicates CPG has selected day TV (DTV).
REMARKS: From FCC through LH FAB MRTU Type I to TEU.
PASS: If first digit on HOD is 1, 3, 5, or 7, go to paragraph 15–231.
FAIL: Location of fault: LH FAB MRTU Type I, wiring from LH FAB MRTU Type I to TEU, TEU.
Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–231 SIGNAL NAME: TV SENSOR SELECT (ACY) TV SELECT SW (ACZ)
MEMORY LOCATION: 000412
MEMORY DATA BIT(S): 16 (BINARY)
CONDITION: (None)
SIGNAL FUNCTION: Selects DTV.
REMARKS: From ORT lefthand grip through CPG MRTU Type III to FCC.
PASS: Location of fault second digit on HOD is 1, 3, 5, or 7: replace DSA (TM 1–1270–476–20).
FAIL: Location of fault: ORT LH grip, ORT, wiring from ORT to CPG MRTU Type III, CPG MRTU Type
III. Troubleshoot wiring to isolate fault (TM 1–1270–476–T).
15–232 SIGNAL NAME: CPG ANTI–ICE SW
MEMORY LOCATION: 000437
MEMORY DATA BIT(S): 19 (BINARY)
CONDITION: CPG ANTI–ICE SW to GND
SIGNAL FUNCTION: Monitors position of CPG AUX/ANTI ICE panel TADS/PNVS switch.
REMARKS: From CPG AUX/ANTI ICE panel through CPG MRTU Type III to FCC. Enables or
disables anti–ice functions for TADS/ PNVS.
PASS: If first digit on heads out display (HOD) is 1, 3, 5, or 7, go to paragraph 15–233.
FAIL: Location of fault: CPG AUX/ANTI ICE panel, wiring from CPG AUX/ANTI ICE panel to CPG
MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–8).
