TM 1–1520–238–T–3
3–6
Change 4
3–18 SIGNAL NAME:
DASEC STATUS WORD SERIAL DIGITAL ERROR (ACY) S/D ERROR (ACZ)
MEMORY LOCATION: 002113
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates heading attitude reference system (HARS) ability to acknowledge
whether an error has been flagged.
REMARKS: From DASEC to FCC.
PASS:
If fourth digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 3–19.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–19 SIGNAL NAME:
DASEC STATUS WORD TERMINAL FLAG (ACY) MESSAGE ERROR (ACZ)
MEMORY LOCATION: 002150
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of bits 16, 15, or 13.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 3–20.
FAIL: Location of fault: go to paragraph 3–22.
3–20 SIGNAL NAME:
DASEC STATUS WORD BIT PROCESSOR (ACY) CPU BIT STATUS (ACZ)
MEMORY LOCATION: 002150
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates ability of word bit processor to work properly.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 2 or 6, go to paragraph 3–21.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–21 SIGNAL NAME:
DASEC STATUS WORD OUTPUT CLEAR
MEMORY LOCATION: 002150
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of power up latch.
REMARKS: From DASEC to FCC.
PASS:
If first digit displayed on HOD is 6, go to paragraph 3–22.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
3–22 SIGNAL NAME:
DASEC STATUS WORD DISCRETE OUTPUT BIT (ACY) DO BIT (ACZ)
MEMORY LOCATION: 002150
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates status of 5 VDC and 28 VDC discretes.
REMARKS: From DASEC to FCC.
PASS:
If second digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 3–23.
FAIL: Location of fault: replace DASEC (TM 1–1520–238–23).
