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PLT DECOUPLER DIR 1 (ACY) P DIR DCPL1 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
CPG LVDT LAT (ACY) C LAT LVDT STAT (ACZ) |
TM 1–1520–238–T–3
3–26
Change 4
3–113 SIGNAL NAME:
PLT CYCLIC GRIP FAIL (ACY) PLT CYC GRIP STAT (ACZ)
MEMORY LOCATION: 002107
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of force trim and ASE release buttons to function properly.
REMARKS: From DASEC to FCC.
PASS:
If second digit displayed on HOD is 0, go to paragraph 3–114.
FAIL: Location of fault: pilot cyclic grip, wiring from pilot cyclic grip to DASEC. Troubleshoot wiring to
isolate fault (TM 1–1520–238–T–7).
3–114 SIGNAL NAME:
SQUAT SWITCH FAIL (ACY) SQUAT SWITCH STAT (ACZ)
MEMORY LOCATION: 002107
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates position of squat switch.
REMARKS: From squat switch through squat relay and DASEC to FCC.
PASS:
If first digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–115.
FAIL: Location of fault: squat switch, wiring from squat switch to squat relay, squat relay, wiring from
squat relay to DASEC, DASEC. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
3–115 SIGNAL NAME:
ROTOR BRAKE FAIL (ACY) ROTOR BRAKE STAT (ACZ)
MEMORY LOCATION: 002107
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of rotor brake switch to function properly.
REMARKS: From DASEC to FCC. This failure message will occur with other failure messages.
PASS:
If first digit displayed on HOD is 0 or 1, refer to failure symptom index and next failure
symptom paragraph.
FAIL: Location of fault: rotor brake switch, wiring from rotor brake switch to DASEC. Troubleshoot
wiring to isolate fault (TM 1–1520–238–T–7).
3–116 SIGNAL NAME:
CPG LVDT LONG (ACY) C LONG LVDT STAT (ACZ)
MEMORY LOCATION: 002110
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of CPG longitudinal (pitch) LVDT.
REMARKS: From CPG longitudinal (pitch) LVDT through DASEC to FCC.
PASS:
If sixth digit displayed on HOD is 0, go to paragraph 3–117.
FAIL: Location of fault: CPG longitudinal (pitch) LVDT, wiring from LVDT to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
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