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COLL VALVE CMD MONITOR (ACY) CLTV VLV MON 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
HARS FAIL (ACY) HARS TEST STAT (ACZ) |
TM 1–1520–238–T–3
3–20
Change 4
3–85 SIGNAL NAME:
PITCH A–B MISTRACK (ACY) PITCH ACTR MISTRK (ACZ)
MEMORY LOCATION: 002105
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates that the yaw A and B actuators are tracking each other within a
tolerance of 9% to 19%.
REMARKS: From DASEC to FCC.
PASS:
If third digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–86.
FAIL: Location of fault: longitudinal (pitch) servoactuator LVDTs, wiring from DASEC to longitudinal
(pitch) servoactuator LVDTs. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
3–86 SIGNAL NAME:
A/S DISCRETES INVALID (ACY) AIR DATA STAT (ACZ)
MEMORY DATA BIT(S):
002105
MEMORY LOCATION: 13
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of ADS data.
REMARKS: From DASEC to FCC.
PASS:
If third digit displayed on HOD is 0 or 2, go to paragraph 3–87.
FAIL: Location of fault: refer to Chapter 2, paragraph 2–1.
3–87 SIGNAL NAME:
PROCESSOR FAIL (ACY) ASE CMPTR (ACZ)
MEMORY LOCATION: 002105
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of DASEC processor to execute each type of instruction.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 0, 1, 4, or 5, go to paragraph 3–88.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–88 SIGNAL NAME:
DASE SUBSYSTEM FAIL (ACY) ASE SYSTEM STAT (ACZ)
MEMORY LOCATION: 002106
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of DASE subsystem.
REMARKS: From DASEC to FCC.
PASS:
If sixth digit displayed on HOD is 0, go to paragraph 3–89.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–89 SIGNAL NAME:
DASEC FAIL (ACY) DASE CMPTR STAT (ACZ)
MEMORY LOCATION: 002106
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates capability of DASEC to pass all internal processor and input/output
wraparound tests.
REMARKS: From DASEC to FCC.
PASS:
If fifth digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 3–90.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
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