TM 1–1520–238–T–3
13–4
Change 4
13–8 SIGNAL NAME:
TOP STAB ACTUATOR POSITION
MEMORY LOCATION: 002114
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
For an actuator failure in extended position, memory response is 077160.
For an actuator failure in retracted position, memory response is 100000.
Slew stabilator. If actuator moves in either direction, record reading. If memory location
does not show increase or decrease, a failure exists.
SIGNAL FUNCTION:
Indicates top stabilator actuator position.
REMARKS: From top actuator to SCU 1, SCU 1 through DASEC to FCC.
PASS:
If actuator moves in either direction, go to paragraph 13–9.
FAIL: Location of fault: top actuator, wiring from top actuator to SCU 1, SCU 1, wiring from SCU 1 to
DASEC, DASEC. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
13–9 SIGNAL NAME:
SCU 1 BITE VALID (ACY) AFT SCU BIT OK (ACZ)
MEMORY LOCATION: 002130
MEMORY DATA BIT(S):
5
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates if SCU 1 has failed.
REMARKS: From SCU 1 through DASEC to FCC.
PASS:
If fifth digit on HOD is 4 or 5, go to paragraph 13–10 (ACY) or 13–9A (ACZ).
FAIL: Location of fault: SCU 1, wiring from SCU 1 to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 1–1520–238–T–7).
13–9A SIGNAL NAME:
FWD SCU GND REF (ACZ)
MEMORY LOCATION: 002130
MEMORY DATA BIT(S):
12
(BINARY)
CONDITION:
Should always be zero
SIGNAL FUNCTION:
Generates NO–GO message.
REMARKS: From SCU 1 through DASEC to FCC.
PASS:
If fifth digit on HOD is 4 or 5, go to paragraph 13–10.
FAIL: Location of fault: SCU 1, wiring from SCU 1 to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 1–1520–238–T–7).
13–10 SIGNAL NAME:
SCU 1 STATUS (ACY) AFT SCU STAT (ACZ)
MEMORY LOCATION: 002130
MEMORY DATA BIT(S):
4
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Generates NO GO message.
REMARKS: From SCU 1 through DASEC to FCC.
PASS:
If the sixth digit on HOD is 0, troubleshoot wiring between SCU 1 and SCU 2
(TM 1–1520–238–T–7).
FAIL: Location of fault: SCU 1, wiring from SCU 1 to SCU 2, wiring from SCU 1 to DASEC, DASEC.
Troubleshoot wiring to isolate fault (TM 1–1520–238–T–7).
