TM 1–1520–238–T–3
7–10
Change 4
7–33 SIGNAL NAME:
CONTRAST TO PLT DAP (ACY) PLT IHAD CTRS CMD (ACZ)
MEMORY LOCATION: 001607
MEMORY DATA BIT(S):
4–19 (ACY) 4–15 (ACZ)
(SCALAR)
CONDITION:
Monitor ORT IHAD display contrast signal level to pilot DAP as contrast is adjusted
from minimum (–) to maximum (+).
SIGNAL FUNCTION:
Controls IHADSS contrast.
REMARKS: From FCC through RH FAB MRTU Type I to pilot DAP.
PASS:
If condition is met refer to failure symptom index and next failure symptom paragraph.
FAIL: Location of fault: RH FAB MRTU Type I, wiring from RH FAB MRTU Type I to pilot DAP, pilot
DAP. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–34 SIGNAL NAME:
PLT BRSIT HMD SW
MEMORY LOCATION: 001122
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors pilot boresight (BRSIT) helmet mounted display (HMD) switch.
REMARKS: From pilot collective through LH FAB MRTU Type I to FCC.
PASS:
If the fourth digit is 0, 2, 4, or 6 go to paragraph 7–35.
FAIL: Location of fault: pilot collective, wiring from pilot collective to LH FAB MRTU Type I, LH FAB
MRTU Type I. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–35 SIGNAL NAME:
PLT FCP IHADSS BRSIT SW (ACY) PLT IHAD BST SW1 (ACZ)
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
10
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors pilot boresight switch.
REMARKS: From pilot fire control panel (FCP) through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 1, 3, 5, or 7, go to paragraph 7–35A.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–35A SIGNAL NAME:
PLT FCP IHADSS BRSIT NOT SW (ACY) PLT IHAD BST SW2 (ACZ)
MEMORY LOCATION: 001117
MEMORY DATA BIT(S):
11
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors pilot boresight switch.
REMARKS: From pilot fire control panel (FCP) through LH FAB MRTU Type I to FCC.
PASS:
If third digit on HOD is 4 or 5, go to paragraph 7–36.
FAIL: Location of fault: pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU Type
I. Troubleshoot wiring to isolate fault (TM 9–1270–221–23).
7–36 SIGNAL NAME:
PILOT BRSIT MODE
MEMORY LOCATION: 001571
MEMORY DATA BIT(S):
9
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Monitors boresight mode.
REMARKS: From SEU through RH FAB MRTU Type I to FCC.
PASS:
If fourth digit on HOD is 2, 3, 6, or 7, go to paragraph 7–37.
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).
