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are shown in the sight status section. Autonomous designation
is defined as when the missile code of the
priority channel and the code of the LRF/D are the
same and the selected sight is TADS plus the laser power
is turned on. Remote designation is defined as when
the missile code of the priority channel and the code of
the LRF/D are not the same.
Time of flight is displayed for all missile launches and
reflects the time of flight for the missile closest to the
target. Temperature compensation is incorporated
when calculating missile time of flight m /m. Ripple
fire engagements have individual time of flight
counters displayed, one for the autonomous missile,
and one for the remotely designated missile, regardless
of the order of their launch.
With -45 software the pilot cannot launch missiles for
autonomous designation; consequently only one set of
prompts is displayed in the weapons status section of
the high action display m. Time of flight is displayed
to the pilot for any missile that he has launched. With
-49 software the pilot can conduct autonomous
launches. Pilot prompts and TOF displays remain the
same as described above. Steering commands for the
missile constraints box will be driven by the TADS LOS
during LOAL DIR. The missile constraint steering box
will be driven by the NAV LOS regardless of autonomous
or remote moding during LOAL HI and LOAL LO
launches m / RZD.
The sight status section will reflect the codes of the upper
and lower channels, UP=ALO=B; the code of the
priority channel will flash. Authorized engagement
ranges for the Hellfire System are from 500 meters to
8000 meters.
4.11 FIRE CONTROL COMPUTER (FCC).
The FCC is the primary bus controller. The FCC controls
all data transmissions on the multiplex bus during
normal operations. The FCC processes and computes
data for all tire control capabilities on board the
helicopter (fig 4-8). The FCC continuously executes internal
built-in-tests and in the event of a failure signals
the BBC to assume control of the bus. The FCC, BBC
and FAB MRTUs are turned on with the switch labeled
FCC/MUX ON (fig 4-14). Flight crew personnel shall
ensure that this switch is in the ON position at all
4-14 Change 4
times, except for when applying power to the aircraft
systems when the aircraft has been heat soaked in direct
sunlight for more than 1 hour and the ambient
temperature exceeds 100 degrees Fahrenheit. With
these conditions present, the FCC/MUX switch shall
be placed in the OFF position for at least two minutes
after power has been applied with the FAB fans running
in the STBY position to remove the superheated
air from within the critical LRUs. Otherwise the switch
is ON during any ground or flight operations. The FCC
receives 115 vac power from the No. 1 essential bus and
28 vdc power from the No. 3 essential dc bus and is protected
by the FCC AC and FCC DC circuit breakers located
on the CPG circuit breaker panel. To determine
the FCC software code, place the DEK to SPl and
enter C. The software code is displayed to the right of
the dash. To determine the m FCC software code,
press the CDU PGM FAB. The software version is displayed
on line 6 of the CDU display.
4.12 BACKUP BUS CONTROLLER (BBC).
The BBC is part of the CPG MRTU (fig 4-8). The BBC
monitors the primary bus controller for faults during
normal operations. The BBC automatically assumes
control of the multiplex bus when it senses a failure of
the FCC. The CPG can manually select the BBC as the
primary bus controller by placing the MUX switch on
the CPG FIRE CONTROL panel (fig 4-14) to the SEC
position. When the BBC is the primary bus controller
several fire control operational capabilities are not
available. They are: Gun and Rocket ballistic solutions;
Fault Detection/Location System; and Waypoint/Targeting.
All other fire control capabilities are available
and function identically as under FCC bus control. The
BBC receives 28 vdc power from the No. 3 Essential DC
bus and is protected by the MUX/CPG circuit breaker
located on the CPG circuit breaker panel. The status of
the BBC is continuously monitored by FD/LS; the on
command test (test OS-MUX) will fault isolate to the
LRU.
4.13 MULTIPLEX BUS SUBSYSTEM (MUX).
The MUX (fig 4-8) consists of remote terminal (RT)
units and a redundant data bus. The RTs are used to
interface the various subsystems on board the helicopter.
Three helicopter subsystems, the digital automatic
stabilization equipment (DASE), the remote Hellfire
electronics (RHE) unit, and the symbol generator also
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