TM 1–1520–238–T–3
Change 4
23–3/(23–4 blank)
23–6 SIGNAL NAME:
NEG RADAR ALTITUDE (ACY) NEG RADALT (ACZ)
MEMORY LOCATION: 001544
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
Press the PUSH TO TEST knob on RHI while observing 1000 (100) feet on HOD.
SIGNAL FUNCTION:
Indicates RADALT altitude.
REMARKS: From RADALT through RH FAB MRTU Type I to FCC.
PASS:
If CONDITION is observed, go to Chapter 14, paragraph 14–94.
FAIL: Location of fault: receiver–transmitter, wiring from receiver–transmitter to remote height
indicator, remote height indicator, wiring from remote height indicator to RH FAB MRTU Type I,
RH FAB MRTU Type I. Troubleshoot analog wiring to isolate fault (TM 11–1520–238–23–2).
23–7 SIGNAL NAME:
RADAR HI ALTITUDE WARNING
MEMORY LOCATION: 001555
MEMORY DATA BIT(S):
16
(BINARY)
CONDITION:
Press the PUSH TO TEST knob on RHI while observing HOD.
SIGNAL FUNCTION:
Indicates HI on VDU.
REMARKS: From RADALT through RH FAB MRTU Type I to FCC.
PASS:
If second digit displayed on HOD is 0, 2, 4, or 6, go to paragraph 23–8.
FAIL: Location of fault: receiver–transmitter, wiring from receiver–transmitter to remote height
indicator, remote height indicator, wiring from remote height indicator to pilot matrix module,
wiring from pilot matrix module to RH FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot
push–to–test wiring and HI WARN wiring to isolate fault (TM 11–1520–238–23–2).
23–8 SIGNAL NAME:
PILOT HI CONT
MEMORY LOCATION: 000701
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
Set HI SET index to 1200 feet and press the PUSH TO TEST knob on RHI while
observing HOD.
SIGNAL FUNCTION:
Displays HI on VDU when RHI is above HI SET altitude.
REMARKS: From FCC to symbol generator.
PASS:
If first digit displayed on HOD is 4 or 5, go to Chapter 14, paragraph 14–93.
FAIL: Location of fault: receiver–transmitter, wiring from receiver–transmitter to remote height
indicator, remote height indicator, wiring from remote height indicator to pilot matrix module,
wiring from pilot matrix module to RH FAB MRTU Type I, RH FAB MRTU Type I. Troubleshoot
wiring to isolate fault (TM 11–1520–238–23–2).
