TM 1–1520–238–T–3
14–24
Change 4
14–97 SIGNAL NAME:
PLT VSI CONT
MEMORY LOCATION: 000701
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates rate of climb and HI/LO displays.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–98.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–98 SIGNAL NAME:
PLT VSI
MEMORY LOCATION: 000701
MEMORY DATA BIT(S):
4–11
(SCALAR)
CONDITION:
Displays pilot VSI on VDU. Monitor HOD; memory location should indicate negative for
down and positive for up.
SIGNAL FUNCTION:
Displays rate of climb (vertical velocity) for heading and attitude reference set
(HARS) and Doppler.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if CONDITION is met: replace symbol generator (TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–99 SIGNAL NAME:
PLT HDG CONT
MEMORY LOCATION: 000702
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates pilot heading.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–100.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–100 SIGNAL NAME:
PLT HDG
MEMORY LOCATION: 000702
MEMORY DATA BIT(S):
4–15
(SCALAR)
CONDITION:
Displays pilot heading on VDU. Monitor HOD; memory location should indicate
negative from 180 to 360 degrees and positive from 000 to 180 degrees.
SIGNAL FUNCTION:
Indicates aircraft magnetic heading.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if CONDITION is met: replace symbol generator (TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–101 SIGNAL NAME:
PLT OPEN HDG CONT (ACY) PLT HDGCUE1 CTL (ACZ)
MEMORY LOCATION: 000703
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates pilot open heading cue.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–102.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
