TM 1–1520–238–T–3
20–30
20–79 SIGNAL NAME:
DOP VERTICAL VEL
MEMORY LOCATION: 000531 AND 000532
MEMORY DATA BIT(S):
16–4 AND 19–18
(SCALAR)
CONDITION:
Monitor HOD, digits 6, 5, 4, 3 and 2 should read 0
SIGNAL FUNCTION:
Indicates Doppler vertical velocity.
REMARKS: From Doppler through CPG MRTU Type III to FCC.
PASS:
If CONDITION agrees with vertical velocity, go to paragraph 20–80.
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).
20–80 SIGNAL NAME:
HARS MAGHDG
MEMORY LOCATION: 002162
MEMORY DATA BIT(S):
4–19
(SCALAR)
CONDITION:
Monitor HOD while moving aircraft or HARS; 0 DEG=000000, 180.000 DEG=100000,
359.999 DEG=177777
SIGNAL FUNCTION:
Monitors HARS magnetic heading.
REMARKS: From HARS through DASEC to FCC.
PASS:
Location of fault if condition is met: wiring between HARS and aft avionics matrix module, aft
avionics matrix module to SDC. Troubleshoot wiring to isolate fault (TM 11–1520–238–23–2).
FAIL: Location of fault: HARS, wiring from HARS to DASEC, DASEC. Troubleshoot wiring to isolate
fault (TM 11–1520–238–23–2).
