TM 1-1510-223-10
Table 2-8. Mission Control Panel Annunciator Legend
MISSION ANNUNCIATOR
NOMENCLATURE
COLOR
CAUSE FOR ILLUMINATION
MSN OVERTEMP
Yellow
Overtemp condition in mission equipment.
CRYPTO ALERT
Yellow
Security equipment Is holding cipher key when aircraft's wheels are down and TWTA
INTLK DEFEAT toggle switch on mission status panel is set to OFF position.
PWR SPLY FAULT
Yellow
Failure in mission equipment power supply.
CALL
Yellow
A request for VOW communication is being received by mission equipment.
3 0 AC OFF
Yellow
Loss of three-phase AC power from either mission inverter if 3 0 AC CONTROL BUS
CROSS TIE switch is set to OFF. Indicates a loss of three-phase AC power from
both mission inverters if 3 0 AC CONTROL BUS CROSS TIE switch is set to ON.
CABIN OVERTEMP
Yellow
Cabin area containing mission equipment is overheating.
MISSION POWER
Yellow
No power to mission equipment.
LINK MODE
Yellow
ANT STEERING switch is in either MANUAL or GROUND position, or ANT SELECT
switch is in either NOSE or TAIL position.
RADOME HOT
Yellow
Overtemperature condition inside IDL nose radome.
LINK SYNC
Yellow
CMD LINK, CMD SYNC, DATA LINK, DATA SYNC, or PHASE LED on mission status
panel is illuminated.
SPCL EQPT OVRD
Yellow
Aircraft's normal +28 VDC source has been overridden to provide remaining +28 VDC
power sources to mission equipment. Enabled when MISSION CONTROL switch is set
to ORIDE position.
TWTA STANDBY
Yellow
TWTA/upconverter is in STANDBY mode.
ANT MALF
Yellow
Tail boom antenna is not in proper position as set by ANT ORIDE switch or landing gear
uplock switch.
NO INS UPDATE
Yellow
No INS update data from either TACAN, data link, or GPS to aircraft's INS equipment.
TDOA OVERTEMP
Yellow
Overtemperature condition in processor/power supply.
LB PS OVERTEMP
Yellow
Overtemperature condition in low band receiver power supply.
ASE SILENT
Yellow
Transmitting elements of ASE are in passive mode.
TDOA FAULT
Yellow
Failure in TDOA system equipment. Also illuminates during BIT mode for TDOA system
equipment. If it remains lit for mode than 10 minutes during BIT mode, indicates a failure
in TDOA system equipment.
LB PS FAULT
Yellow
Failure in low band receiver power supply.
ELINT FAULT
Yellow
Power failure in ELINT system equipment.
ANT STOWED
Green
Tail boom antenna is in horizontal stowed position.
ANT OPERATE
Green
Tail boom antenna is in vertical operating position.
RADOME HEAT
Green
IDL nose radome deicer is on. Enabled by RADOME anti-ice switch on overhead control
panel.
MISSION AC ON
Green
Three-phase AC power is being applied to mission inverter #2 AC bus. Enabled when 3
O AC CONTROL #2 INV switch is in ON position, or when #2 INV switch Is In OFF
position and BUS CROSS TIE switch is in ON/AUTO position and #1 INV switch is in ON
position.
INS UPDATE
Green
INS update is received by aircraft's INS equipment from either TACAN, data link, or
GPS.
TDOA PWR ON
Green
115 VAC power is applied to TDOA system equipment. Enabled by TDOA SYSTEM.
MISSION DC ON
Green
+28 VDC power is applied to mission equipment. Enabled by MISSION CONTROL
switch.
WAVE GUIDE
Green
IDL waveguides are pressurized.
EXT AC PWR ON
Green
AC power source is connected and applied to aircraft.
BT00105
(4) Zulu or Greenwich mean time mode (ZU).
Press the MODE button to advance the annunciator
to ZU and set time as for local time shown above.
Minutes and seconds do not need to be reset if local time
is correctly
set Press the RST button to display minutes/seconds,
then press again to activate the complete display.
When changing time zones, the hour may be
changed as
2-83
