TM 1–1520–238–T–3
Change 4
6–9
6–31 SIGNAL NAME:
HARS COS MAGHDG
MEMORY LOCATION: 002161
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; HARS COS MAGHDG positive increases from West to East (HARS SIN
MAGHDG negative decreases from East to West).
SIGNAL FUNCTION:
Monitors HARS cosine of magnetic heading with respect to the navigational
heading.
REMARKS: From HARS through DASEC to FCC.
PASS:
Location of fault if conditions are met, go to Chapter 20, paragraph 20–80.
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
6–32 SIGNAL NAME:
HARS LAT
MEMORY LOCATION: 002151
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; HARS LAT positive equals left movement (HARS LAT negative equals
right movement).
SIGNAL FUNCTION:
Most significant 16 bits of HARS latitude estimate.
REMARKS: From HARS through DASEC to FCC.
PASS:
If conditions are met, go to paragraph 6–33.
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
6–33 SIGNAL NAME:
HARS LAT L (ACY) HARS LAT LSB’S (ACZ)
MEMORY LOCATION: 002153
MEMORY DATA BIT(S):
4–11
(SCALAR)
CONDITION:
Monitor HOD; HARS LAT L positive equals left movement (HARS LAT L negative
equals right movement).
SIGNAL FUNCTION:
Least significant 8 bits of HARS latitude estimate.
REMARKS: From HARS through DASEC to FCC.
PASS:
If conditions are met, go to paragraph 6–34.
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
6–34 SIGNAL NAME:
HARS LONG
MEMORY LOCATION: 002152
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD; HARS LONG positive equals forward movement (HARS LONG negative
equals aft movement).
SIGNAL FUNCTION:
Most significant 16 bits of HARS longitude estimate.
REMARKS: From HARS through DASEC to FCC.
PASS:
If conditions are met, go to paragraph 6–35.
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
