TM 1–1520–238–T–3
Change 4
6–7
6–23 SIGNAL NAME:
HARS NORTH
MEMORY LOCATION: 002202
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
When in bob–up mode, HARS integraters are reset. HARS begins to indicate drift in +
(North) and – (South) based on velocity computed from integrating accelerometer
outputs.
SIGNAL FUNCTION:
Indicates north movement when in bob–up mode.
REMARKS: From HARS through DASEC to FCC.
PASS:
If conditions are met go to paragraph 6–24.
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
6–24 SIGNAL NAME:
HARS EAST
MEMORY LOCATION: 002203
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
When in bob–up mode, HARS integraters are reset. HARS begins to indicate drift in
+(East) and – (West) based on velocity computed from integrating accelerometer
outputs.
SIGNAL FUNCTION:
Indicates east movement when in bob–up mode.
REMARKS: From HARS through DASEC to FCC.
PASS:
If conditions are met go to paragraph 6–25.
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
6–25 SIGNAL NAME:
MAGVAR TO HARS (ACY) MAGVAR AID (ACZ)
MEMORY LOCATION: 002232
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; MAGVAR positive equals 0 to 180 DEG and MAGVAR negative equals
180 to 360 DEG.
SIGNAL FUNCTION:
Determines position of magnetic variation.
REMARKS: From FCC through DASEC to HARS.
PASS:
If conditions are met go to paragraph 6–26.
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
6–26 SIGNAL NAME:
USE MAGHDG CTL (ACY) MAGVAR AID VALID (ACZ)
MEMORY LOCATION: 002235
MEMORY DATA BIT(S):
6
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Instructs HARS to use the MAGHDG input when in the inflight align mode.
REMARKS: From FCC through DASEC to HARS.
PASS:
If fifth digit on HOD is 2, 3, 6, or 7, go to paragraph 6–27.
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
