Table 2-8. Mission Control Panel Annunciator Legend
CAUSE FOR ILLUMINATION
Overtemp condition in mission equipment.
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
Failure in mission equipment power supply.
A request for VOW communication is being received by mission equipment.
3 0 AC OFF
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 area containing mission equipment is overheating.
No power to mission equipment.
ANT STEERING switch is in either MANUAL or GROUND position, or ANT SELECT
switch is in either NOSE or TAIL position.
Overtemperature condition inside IDL nose radome.
CMD LINK, CMD SYNC, DATA LINK, DATA SYNC, or PHASE LED on mission status
panel is illuminated.
SPCL EQPT OVRD
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/upconverter is in STANDBY mode.
Tail boom antenna is not in proper position as set by ANT ORIDE switch or landing gear
NO INS UPDATE
No INS update data from either TACAN, data link, or GPS to aircraft's INS equipment.
Overtemperature condition in processor/power supply.
LB PS OVERTEMP
Overtemperature condition in low band receiver power supply.
Transmitting elements of ASE are in passive mode.
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
Failure in low band receiver power supply.
Power failure in ELINT system equipment.
Tail boom antenna is in horizontal stowed position.
Tail boom antenna is in vertical operating position.
IDL nose radome deicer is on. Enabled by RADOME anti-ice switch on overhead control
MISSION AC ON
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
INS update is received by aircraft's INS equipment from either TACAN, data link, or
TDOA PWR ON
115 VAC power is applied to TDOA system equipment. Enabled by TDOA SYSTEM.
MISSION DC ON
+28 VDC power is applied to mission equipment. Enabled by MISSION CONTROL
IDL waveguides are pressurized.
EXT AC PWR ON
AC power source is connected and applied to aircraft.
(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
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