TM 1–1520–238–T–3
6–8
Change 4
6–27 SIGNAL NAME:
MAGHDG TO HARS (ACY) MAGHDG AID (ACZ)
MEMORY LOCATION: 002234
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; MAGHDG positive equals 0 to 180 DEG and MAGHDG negative equals
180 to 360 DEG.
SIGNAL FUNCTION:
Delivers magnetic heading to HARS.
REMARKS: From FCC through DASEC.
PASS:
If conditions are met go to paragraph 6–28.
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).
6–28 SIGNAL NAME:
LAT TO HARS (ACY) LAT AID (ACZ)
MEMORY LOCATION: 002233
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; LAT TO HARS positive equals an increasing latitude (LAT TO HARS
negative equals a decreasing latitude).
SIGNAL FUNCTION:
Delivers latitude to HARS.
REMARKS: From FCC through DASEC to HARS.
PASS:
Location of fault if conditions are met: HARS, wiring from HARS to DASEC, DASEC
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
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).
6–29 SIGNAL NAME:
HARS FREE INERTIAL IND (ACY) HARS FREE IND (ACZ)
MEMORY LOCATION: 002154
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates HARS is in free inertial mode (not caged to velocity inputs).
REMARKS: From HARS through DASEC to FCC.
PASS:
If second digit on HOD is 4, 5, 6, or 7, go to paragraph 6–30.
FAIL: Location of fault: go to Chapter 20, paragraph 20–57.
6–30 SIGNAL NAME:
HARS SIN MAGHDG
MEMORY LOCATION: 002160
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; HARS SIN MAGHDG positive increases from West to East (HARS SIN
MAGHDG negative decreases from East to West).
SIGNAL FUNCTION:
Monitors HARS sine of magnetic heading.
REMARKS: From HARS through DASEC to FCC.
PASS:
Location of fault if conditions are met, go to paragraph 6–31.
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
