TM 1–1520–238–T–3
20–11
20–24 SIGNAL NAME:
DOP GROUND SPEED
MEMORY LOCATION: 000463
MEMORY DATA BIT(S):
11–8
(HEX)
CONDITION:
If second digit displayed on HOD is 0 or 1, and third digit is 0 or 4=0
If second digit displayed on HOD is 2 or 3, and third digit is 0 or 4=1
If second digit displayed on HOD is 4 or 5, and third digit is 0 or 4=2
If second digit displayed on HOD is 6 or 7, and third digit is 0 or 4=3
If second digit displayed on HOD is 0 or 1, and third digit is 2 or 5=4
If second digit displayed on HOD is 2 or 3, and third digit is 1 or 5=5
If second digit displayed on HOD is 4 or 5, and third digit is 1 or 5=6
If second digit displayed on HOD is 6 or 7, and third digit is 1 or 5=7
If second digit displayed on HOD is 0 or 1, and third digit is 2 or 6=8
If second digit displayed on HOD is 2 or 3, and third digit is 2 or 6=9
SIGNAL FUNCTION:
Indicates tens field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
IF CONDITION agrees with ground speed, go to paragraph 20–25.
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III,CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
20–25 SIGNAL NAME:
DOP GROUND SPEED
MEMORY LOCATION: 000463
MEMORY DATA BIT(S):
7–4
(HEX)
CONDITION:
If first digit displayed on HOD is 0, and second digit is 0, 2, 4, or 6=0
If first digit displayed on HOD is 1, and second digit is 0, 2, 4, or 6=1
If first digit displayed on HOD is 2, and second digit is 0, 2, 4, or 6=2
If first digit displayed on HOD is 3, and second digit is 0. 2. 4, or 6=3
If first digit displayed on HOD is 4, and second digit is 0, 2, 4, or 6=4
If first digit displayed on HOD is 5, and second digit is 0, 2, 4, or 6=5
If first digit displayed on HOD is 6, and second digit is 0, 2, 4, or 6=6
If first digit displayed on HOD is 7, and second digit is 0, 2, 4, or 6=7
If first digit displayed on HOD is 0, and second digit is 4, 5, 6, or 7=8
If first digit displayed on HOD is 1, and second digit is 1, 3, 5, or 7=9
SIGNAL FUNCTION:
Indicates ones field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
Location of fault if CONDITION agrees with ground speed: CPG MRTU Type III, wiring from
CPG MRTU Type III to Doppler, and Doppler. Troubleshoot wiring to isolate fault
(TM 9–1230–476–20–1).
FAIL: Location of fault: Doppler, wiring from Doppler to CPG MRTU Type III, CPG MRTU Type III.
Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
20–26 SIGNAL NAME:
DOP SINE PITCH
MEMORY LOCATION: 000465
MEMORY DATA BIT(S):
18–17
(BINARY))
CONDITION:
If fifth digit displayed on HOD is 0 or 1=plus, north, west, up
If fifth digit displayed on HOD is 2 or 3=failure warning
If fifth digit displayed on HOD is 4 or 5=no computed data and no failure detected If fifth
digit displayed on HOD is 6 or 7=minus, south, east, down, from
SIGNAL FUNCTION:
Indicates sine/status of Doppler.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with heading, go to paragraph 20–27.
FAIL: Location of fault: RTA, wiring from RTA to Doppler, Doppler. Troubleshoot wiring to isolate fault
(TM 11–1520–238–23–2).
