TM 1–1520–238–T–3
Change 4
14–25
14–102 SIGNAL NAME:
PLT OPEN HDG CUE (ACY) PLT HDGCUE1 (ACZ)
MEMORY LOCATION: 000703
MEMORY DATA BIT(S):
4–15
(SCALAR)
CONDITION:
Displays pilot open 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 pilot desired 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).
14–103 SIGNAL NAME:
PLT LOSRET CONT
MEMORY LOCATION: 000705
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates pilot LOS reticle.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit is 2, 3, 6, or 7, go to paragraph 14–104.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–104 SIGNAL NAME:
PLT LOSRET AZ
MEMORY LOCATION: 000704
MEMORY DATA BIT(S):
4–11
(SCALAR)
CONDITION:
Displays pilot LOS reticle on VDU. Monitor HOD; memory location should indicate
negative for left and positive for right.
SIGNAL FUNCTION:
Displays PNVS azimuth reference (crosshair) for all symbols.
REMARKS: From FCC to symbol generator.
PASS:
If CONDITION is met, go to paragraph 14–105.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–105 SIGNAL NAME:
PLT LOSRET EL
MEMORY LOCATION: 000704
MEMORY DATA BIT(S):
12–19
(HEX)
CONDITION:
Displays pilot LOS reticle on VDU. Monitor HOD; memory location should indicate
negative for down and positive for up.
SIGNAL FUNCTION:
Displays PNVS elevation reference (crosshair) for all symbols.
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).
14–106 SIGNAL NAME:
PLT POS BOX CONT
MEMORY LOCATION: 000705
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates pilot hover box.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 1, 3, 5, or 7, go to paragraph 14–107.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
