TM 1–1520–238–T–3
12–10
12–29 SIGNAL NAME:
CPG I BEAM AZ
MEMORY LOCATION: 000664
MEMORY DATA BIT(S):
4–15
(SCALAR)
CONDITION:
Monitor HOD; movement of the I BEAM to the left should show a decreasing negative
number (1 in the sixth digit) and movement of the I BEAM to the right of the aircraft
should show a positive increasing number (0 in the sixth digit)
SIGNAL FUNCTION:
Indicates I beam azimuth (pylon angle) position relative to aircraft.
REMARKS: From FCC to symbol generator.
PASS:
If display on HOD corresponds to selected LOS position, go to paragraph 12–30.
FAIL: Location of fault: wiring from DEU to RH FAB MRTU Type I, RH FAB MRTU Type I, for IHADSS
related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly
to TEU, TEU, wiring from TEU to CPG MRTU Type III, CPG MRTU Type III, for TADS related
discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU,
TEU, wiring from TEU to LH FAB MRTU Type I, LH FAB MRTU Type I, wiring from TADS/PNVS
Turret Assembly to PEU, for PNVS related discrepancies. Troubleshoot wiring to isolate fault.
Refer to TM 9–1270–221–23 for integrated helmet and display sight system (IHADSS),
TM 1–5855–265–T for pilot night vision sensor (PNVS), or TM 1–1270–476–T for target
acquisition designation sight (TADS) related discrepancies.
12–30 SIGNAL NAME:
CPG I BEAM EL
MEMORY LOCATION: 000665
MEMORY DATA BIT(S):
4–15
(SCALAR)
CONDITION:
Monitor HOD; movement of the I BEAM down should show a decreasing negative
number (1 in the sixth digit) and movement of the I BEAM up of the aircraft should
show a positive increasing number (0 in the sixth digit)
SIGNAL FUNCTION:
Indicates I beam elevation (pylon angle) position relative to aircraft.
REMARKS: From FCC to symbol generator.
PASS:
If display on HOD corresponds to selected LOS position, replace symbol generator
(TM 11–1520–238–23–2).
FAIL: Location of fault: wiring from DEU to RH FAB MRTU Type I, RH FAB MRTU Type I, for IHADSS
related discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly
to TEU, TEU, wiring from TEU to CPG MRTU Type III, CPG MRTU Type III, for TADS related
discrepancies; TADS/PNVS Turret Assembly, wiring from TADS/PNVS Turret Assembly to TEU,
TEU, wiring from TEU to LH FAB MRTU Type I, LH FAB MRTU Type I, wiring from TADS/PNVS
Turret Assembly to PEU, for PNVS related discrepancies. Troubleshoot wiring to isolate fault.
Refer to TM 9–1270–221–23 for integrated helmet and display sight system (IHADSS),
TM 1–5855–265–T for pilot night vision sensor (PNVS), or TM 1–1270–476–T for target
acquisition designation sight (TADS) related discrepancies.
