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AD REF VOLTAGE FAIL (ACY) ADA REF STAT (ACZ) | Up
TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
1520-01-106-9519) (EIC: RHA) Multiplex Read Codes Manual | Next
ROLL MISTRACK (ACY) ROLL STICK MISTRK (ACZ) |
TM 1–1520–238–T–3
3–16
Change 4
3–67 SIGNAL NAME:
PITCH WRAPAROUND DISC INVALID (ACY) PITCH WRAP STAT (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASEC longitudinal (pitch) servoactuator drive digital
interface signal.
REMARKS: From DASEC to FCC.
PASS:
If fifth digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–68.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–68 SIGNAL NAME:
TICKET CHECK FAIL (ACY) REAL TIME CALC (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
6
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates the current capability of DASEC to complete all internal software tests
necessary to assure DASEC processor and signal path operability.
REMARKS: From DASEC to FCC.
PASS:
If fifth digit displayed on HOD is 0 or 1, go to paragraph 3–69.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–69 SIGNAL NAME:
BUCS WRAPAROUND DISCRETE INVALID (ACY) BUCS WRP STAT (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASEC back up control system (BUCS) solenoid drive
circuitry.
REMARKS: From DASEC to FCC.
PASS:
If fifth digit displayed on HOD is 0, go to paragraph 3–70.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–70 SIGNAL NAME:
COLL MISTRACK (ACY) CLTV STICK MISTRK (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
8
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of pilot and CPG collective stick linear variable differential
transducer (LVDT) positions to agree.
REMARKS: From DASEC to FCC.
PASS:
If fourth digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–71.
FAIL: Location of fault: pilot and CPG collective (vertical) LVDT, wiring from DASEC to collective
(vertical) LVDT. Null collective (vertical) LVDTs. Troubleshoot wiring to isolate fault
(TM 1–1520–238–T–7).
3–71 SIGNAL NAME:
YAW MISTRACK (ACY) YAW STICK MISTRK (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of pilot and CPG pedal LVDT positions to agree.
REMARKS: From DASEC to FCC.
PASS:
If fourth digit displayed on HOD is 0 or 1, go to paragraph 3–72.
FAIL: Location of fault: pilot or CPG pedal LVDT, wiring from DASEC to pedal LVDTs. Null pedal
LVDTs. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
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