TM 1–1520–238–T–3
5–10
Change 4
5–28 SIGNAL NAME:
PLT SIGHT SELECT SW
MEMORY LOCATION: 001122
MEMORY DATA BIT(S):
4–7
(HEX)
CONDITION:
If the sixth digit displayed on HOD is 1 and the fifth digit is 3=HMD
(Chapter 7 paragraph 7–38)
If the sixth digit displayed on HOD is 1 and the fifth digit is 5=PNVS
(Chapter 10 paragraph 10–4)
If the sixth digit displayed on HOD is 1 and the fifth digit is 6=TADS
(Chapter 15 paragraph 15–5)
SIGNAL FUNCTION:
Indicates pilot selected sight sensor.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If CONDITION displayed on HOD corresponds to the pilot FCP sight select switch position,
refer to the appropriate chapter and paragraph as listed under CONDITION.
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 for integrated helmet and display
sight system related discrepancies, TM 1–5855–265–T for pilot night vision sensor related
discrepancies, or TM 1–1270–476–T for target acquisition designation sight related
discrepancies.
5–29 SIGNAL NAME:
PLT CPG ACQ SW (ACY) PLT ACQ SEL SW (ACZ)
MEMORY LOCATION: 001122
MEMORY DATA BIT(S):
8–9
(BINARY)
CONDITION:
If the fourth digit displayed on HOD is 2 or 3=CPG
(Chapter 15, paragraph 15–127)
If the fourth digit displayed on HOD is 4 or 5=NVS FXD
(Chapter 10, paragraph 10–30)
If the fourth digit displayed on HOD is 6 or 7=OFF
SIGNAL FUNCTION:
Selects cueing symbology or NVS to fixed forward.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If fourth digit displayed on HOD is 0, 1, 2, or 3, go to paragraph 5–30.
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 9–1230–476–20–2).
5–30 SIGNAL NAME:
PLT GUN ACTION
MEMORY LOCATION: 001075
MEMORY DATA BIT(S):
15
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates pilot has actioned gun.
REMARKS: From pilot cyclic stick through pilot FCP to LH FAB MRTU Type I to FCC.
PASS:
If second digit displayed on HOD is 2, 3, 6, or 7, go to paragraph 5–31.
FAIL: Location of fault: pilot cyclic stick, wiring from pilot cyclic stick to CPG FCP, wiring from CPG
FCP to pilot FCP, pilot FCP, wiring from pilot FCP to LH FAB MRTU Type I, LH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 9–1090–208–23–2).
5–31 SIGNAL NAME:
PLT GUN FIXED SW
MEMORY LOCATION: 001120
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Enables gun fixed mode of operation.
REMARKS: From pilot FCP through LH FAB MRTU Type I to FCC.
PASS:
If first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 5–32.
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 9–1230–476–20–2).
