TM 1–1520–238–T–3
14–23
14–92 SIGNAL NAME:
PLT RADALT
MEMORY LOCATION: 000677
MEMORY DATA BIT(S):
4–17
(SCALAR)
CONDITION:
Displays radar altitude on VDU. Monitor HOD; memory location should indicate
0 on the ground and increase positive for an increase in altitude.
SIGNAL FUNCTION:
Displays radar altitude from RADALT.
REMARKS: From FCC to symbol generator.
PASS:
If CONDITION is met, go to paragraph 14–93.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–93 SIGNAL NAME:
PLT LO CONT
MEMORY LOCATION: 000701
MEMORY DATA BIT(S):
18
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Displays LO in hover mode when altitude is lower than preset RADALT.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 3, go to paragraph 14–94.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–94 SIGNAL NAME:
PLT HI CONT
MEMORY LOCATION: 000701
MEMORY DATA BIT(S):
17
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Displays HI in hover mode when altitude is higher than preset RADALT.
REMARKS: From FCC to symbol generator.
PASS:
Location of fault if the first digit displayed on HOD is 7: replace symbol generator
(TM 11–1520–238–23–2).
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–95 SIGNAL NAME:
PLT AIRSPEED CONT
MEMORY LOCATION: 000700
MEMORY DATA BIT(S):
19
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Activates pilot airspeed display.
REMARKS: From FCC to symbol generator.
PASS:
If the first digit displayed on HOD is 0, go to paragraph 14–96.
FAIL: Location of fault: replace FCC (TM 9–1230–476–20–1).
14–96 SIGNAL NAME:
PLT AIRSPEED
MEMORY LOCATION: 000700
MEMORY DATA BIT(S):
4–12
(SCALAR)
CONDITION:
Displays airspeed on VDU. Monitor HOD; memory location should indicate
0 on the ground and increase positive for an increasing airspeed.
SIGNAL FUNCTION:
Displays pilot airspeed from air data sensor.
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).
