TM 1–1520–238–T–3
7–3
7–3 SIGNAL NAME:
IHADSS SYSTEM STATUS
MEMORY LOCATION: 001530
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors IHADSS system.
REMARKS: From sight electronics unit (SEU) through right–hand (RH) forward avionics bay (FAB)
MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 0, 1, 4, or 5, go to paragraph 7–4.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–4 SIGNAL NAME:
IHADSS TIME DELAY 1
MEMORY LOCATION: 001562
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
HOD displays all zeros.
SIGNAL FUNCTION:
Monitors IHADSS response time delay.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If condition is met, go to paragraph 7–5.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–5 SIGNAL NAME:
IHADSS TIME DELAY 2
MEMORY LOCATION: 001563
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
HOD displays all zeros.
SIGNAL FUNCTION:
Monitors IHADSS response time delay.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If condition is met, go to paragraph 7–6.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–6 SIGNAL NAME:
IHADSS TIME DELAY 3
MEMORY LOCATION: 001564
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
HOD displays all zeros.
SIGNAL FUNCTION:
Monitors IHADSS response time delay.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If condition is met, go to paragraph 7–7.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–7 SIGNAL NAME:
IHADSS TIME DELAY 4
MEMORY LOCATION: 001565
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
HOD displays all zeros.
SIGNAL FUNCTION:
Monitors IHADSS response time delay.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If condition is met, go to paragraph 7–8.
FAIL: Location of fault: SEU, wiring from SEU to RH FAB MRTU Type I, RH FAB MRTU Type I.
Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
