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displayed for each.
The LST is not operational but the RFD is operational.
LRF/D is not operational but the LST is operational and code selected is “C”.
The LRF/D has detected a multiple target return while ranging or designating. The
proper action is to engage laser countermeasures devices.
Change 1 4-57
TM 1-1520-238-10
Table 4-20. Alpha/Numeric Display Message Location and Description - continued
Message Description
ENHANCEMENT DISPLAY SECTION
FIXD IMPACT RTCL
UP=?PRI LOW=?
UP = A<< PRI LOW =
B
UP . ? pRI >> LOW=
H
Rocket Action - Gun Action. Rocket fixed or gun fixed.
No missiles ready.
Priority channel is upper. Upper code is “A” with missile(s) ready. Lower channel
missiles are ready.
No missiles ready on upper channel. Priority channel is lower and lower code is “H”
with missile(s) ready.
MISSILE INVENTORY AND STATUS SECTION
NOTE
The following displays will be presented based on the position of the TYPE switch on the missile
panel and the types of missiles loaded.
L
I
R
A through H
Laser missile.
IRIS missile.
RF/IR missile.
Code of laser missile in place of the “L” indication.
NOTE
The following characters will be displayed based on the status of a missile. The single status characters
are displayed below the inventory type or code characters. The multiple character status indicators
utilize both positions.
s
R (steady)
R (flashing)
T (steady)
T (flashing)
MU
M
F
SF 4-58
Selected.
Ready.
LOAL priority missile, next missile to be launched.
Missile seeker in track mode.
LOBL priority missile, next missile to be launched.
Missile
Missile
Missile
is unlatched on launcher.
has failed BIT or has been detected as failed subsequent to BIT.
launch station detected as failed.
TM 1-1520-238-10
Table 4-20. Alpha/Numeric Display Message Location and Description - continued
Message Description
T Pylon MRTU cannot communicate with selected missile. Once detected for one missile
F on a particular launcher, all missiles present on that launcher will reflect this status
This status may be cleared by moding the missile system to STBY and then moding
again to desired mode. The remote Hellfire electronics will attempt to communicate
with the missiles on that launcher.
N
A
Missile status has been determined to be: Not Available, Low Coolant or Hangfire in
process.
Missiles that are: Selected, Ready, or Tracking on the same side of the aircraft as a
missile that is hangfiring will reflect a ‘Not Available’ status for six seconds (0:06)
from onset of hangfire. After six seconds the missiles will revert to their previous
status.
M
A
Missile launch sequence has aborted or missile has misfired.
WARNING
This is a valid indication of misfired ordnance. Appropriate safety and ordnance disposal
procedures shall be accomplished.
M
H
Missile is in the process of hangfiring or has hangfired.
This is a valid indication of malfunctioning ordnance. Appropriate emergency procedures
shall be accomplished.
Launcher Status
FF
AA
I I
LL
Launcher has failed BIT or the serial/digital data link between the pylon MRTU and
the launcher has failed.
SS
AA
FF
EE
Launcher ARM/SAFE switch is in the SAFE position and may be armed by taking
the aircraft ARM/SAFE to ARM and back to SAFE.
4-59
TM 1-1520-238-10
4.30 CBHK DATA VALIDATION.
NOTE
l If the fire control computer battery
fails, boresight correctors will not be
maintained
l Non-volatile parameter storage is accomplished
by means of Electrically-
Eraseable Programmable Read-Only
Memory (EEPROM)
The fire control computer (FCC) continually monitors
certain critical internal values derived from the Captive
Boresight Harmonization Kit (CBHK) boresight
correctors. These critical values are used in the correction
or adjustment of line-of-sight and weapons aiming.
In the event of any alteration of these internal FCC values,
the crewmembers will be notified of the affected
sight or weapons subsystem by a message in the HAD
and FD/LS continuous monitoring.
The appropriate message in the HAD will be displayed
whenever the affected sight or weapon is selected. The
FD/LS messages will be announced as part of the continuous
tests described in paragraph 4.15, Fault Detection/
Location System. The effect on the selected sight or
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