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PITCH WRAPAROUND DISC INVALID (ACY) PITCH WRAP 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
COLL WRAPAROUND SUM INVALID (ACY) CLTV SUMWRAP STAT (ACZ) |
TM 1–1520–238–T–3
Change 4
3–17
3–72 SIGNAL NAME:
ROLL MISTRACK (ACY) ROLL STICK MISTRK (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of pilot and CPG lateral (roll) LVDT positions to agree.
REMARKS: From DASEC to FCC.
PASS:
If fourth digit displayed on HOD is 0, go to paragraph 3–73.
FAIL: Location of fault: pilot or CPG lateral (roll) LVDT, wiring from DASEC to LVDTs. Null pilot and
CPG lateral (roll) LVDTs. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
3–73 SIGNAL NAME:
PITCH MISTRACK (ACY) PITCH STICK MISTRK (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of pilot and CPG longitudinal cyclic LVDT positions to
agree.
REMARKS: From DASEC to FCC.
PASS:
If third digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–74.
FAIL: Location of fault: pilot or CPG longitudinal (pitch) LVDT, wiring from DASEC to LVDTs. Null pilot
and CPG longitudinal (pitch) LVDTs. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
3–74 SIGNAL NAME:
PITCH WRAPAROUND SUM INVALID (ACY) PITCH SUMWRAP STAT (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASEC longitudinal (pitch) servoactuator drive circuitry.
REMARKS: From DASEC to FCC.
PASS:
If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 3–75.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–75 SIGNAL NAME:
ROLL WRAPAROUND SUM INVALID (ACY) ROLL SUMWRAP STAT (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASEC lateral (roll) servoactuator drive circuitry.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–76.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–76 SIGNAL NAME:
YAW WRAPAROUND SUM INVALID (ACY) YAW SUMWRAP STAT (ACZ)
MEMORY LOCATION: 002104
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASEC tail rotor actuator drive circuitry.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 0 or 1, go to paragraph 3–77.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
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