TM 1–1520–238–T–3
6–6
Change 4
6–19 SIGNAL NAME:
HARS ROLL RATE
MEMORY LOCATION: 002164
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while banking HARS side to side along roll axis; positive number relates
to right acceleration and negative number relates to left acceleration.
SIGNAL FUNCTION:
Monitors HARS roll rate.
REMARKS: From HARS through DASEC to FCC.
PASS:
Location of fault if conditions are met: wiring from aft avionics module to signal data converter,
SDC, wiring from SDC to RAI. Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
6–20 SIGNAL NAME:
HARS YAW RATE
MEMORY LOCATION: 002165
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor HOD while holding HARS level, swing HARS side to side along yaw axis;
positive number relates to right acceleration and negative number relates to left
acceleration.
SIGNAL FUNCTION:
Monitors HARS yaw rate.
REMARKS: From HARS through DASEC to FCC.
PASS:
Location of fault if conditions are met: wiring from aft avionics module to SDC, SDC, wiring
from SDC to RAI. Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC, SDC, wiring from SDC to
HARS, wiring from CPG RMI to HARS, wiring from CPG HSI to HARS. Troubleshoot wiring to
isolate fault (TM 11–1520–238–23–2).
6–21 SIGNAL NAME:
USE MAGVAR CTL (ACY) MAGVAR AID VALID (ACZ)
MEMORY LOCATION: 002235
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
HARS is directed to update its MAGVAR value with value being sent by FCC.
REMARKS: From FCC through DASEC to HARS.
PASS:
If fourth digit on HOD is 4, 5, 6, or 7, go to paragraph 6–22.
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).
6–22 SIGNAL NAME:
DEK DATA VALID
MEMORY LOCATION: 000444
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates whether keyboard entry is valid and to be read by FCC or keyboard
entry is invalid and to be ignored.
REMARKS: From DEK through CPG MRTU Type III to FCC. This bit identifies erroneous DEK data
words.
PASS:
If fifth digit on HOD is 1, 3, 5, or 7, go to paragraph 6–23.
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type III, DASEC,
wiring from DASEC to HARS. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
