TM 1–1520–238–T–3
20–17
20–41 SIGNAL NAME:
DOP SINE ROLL
MEMORY LOCATION: 000475 AND 000476
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
Monitor HOD; memory location response should indicate a positive if aircraft is in right
roll or a negative if aircraft is in left roll.
SIGNAL FUNCTION:
Indicates Doppler sine roll.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION has been met go to paragraph 20–42.
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).
20–42 SIGNAL NAME:
DOP CROSSTRACK DEVIATION (–399.9/+399.9 KM)
MEMORY LOCATION: 000477
MEMORY DATA BIT(S):
19–18
(BINARY)
CONDITION:
If sixth digit displayed on HOD is 0, and fifth digit is 0, 1, 2, or 3=plus, north, west, up,
to
If sixth digit displayed on HOD is 0, and fifth digit is 4, 5, 6, or 7=failure warning
If sixth digit displayed on HOD is 1, and fifth digit is 0, 1, 2, or 3=no computed data and
no failure detected
If sixth digit displayed on HOD is 1, and fifth digit is 4, 5, 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 crosstrack deviation, go to paragraph 20–43.
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).
20–43 SIGNAL NAME:
DOP CROSSTRACK DEVIATION
MEMORY LOCATION: 000477
MEMORY DATA BIT(S):
17–16
(BINARY)
CONDITION:
If fifth digit displayed on HOD is 0 or 4=0
If fifth digit displayed on HOD is 1 or 5=1
If fifth digit displayed on HOD is 2 or 6=2
If fifth digit displayed on HOD is 3 or 7=3
SIGNAL FUNCTION:
Indicates hundreds field.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with crosstrack deviation, go to paragraph 20–44.
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).
