The system configuration provides for dual
flight directors and single autopilot/yaw
damper operation. The autopilot can be cou-
pled to either flight director. The right IC-
600 also provides rudder boost using the same
servo as used by the yaw damper.
The No.1 IC-600 contains specific airplane
control functions such as primary trim, Mach
trim, and configuration trim when the au-
topilot is not engaged.
The IC-600 computers are interconnected al-
lowing the flight guidance and symbol gen-
erators to share, compare and communicate
information.
The CAS monitors the IC-600 bus intercon-
nect, the temperature of each IC-600, the IC
cooling fans and the weight-on-wheels (WOW)
signal. An amber “IC BUS FAIL” message on
the CAS indicates that communication be-
tween the left and right IC/SG is invalid or the
off-side IC/SG has failed.
An amber “IC 1 or 2 OVHT” message indicates
that the corresponding IC-600 has reached an
overheat condition (> 110° C), although it
should continue to operate. If the tempera-
ture exceeds 140°C, the IC/SG will automat-
ically shut down. The amber “IC 1 or 2 OVHT”
message may be preceded by a white “IC 1 or
2 FAN FAIL” message if the overheat was due
to a fan failure.
The white “IC 1 or 2 WOW INOP” message
will appear if the IC-600(s) is/are not receiv-
ing valid weight-on-wheels information.
Failure of an IC-600 or failure of the symbol
generator within the IC-600 is indicated by
blanking of both on-side display units (DUs),
a large red X on one or both DUs, or erro-
neous/erratic display of data on either or both
failed side DUs. An IC/SG reversion switch is
provided on the REVERSION panel (Figure
16-4) which allows selection of either IC/SG
to drive the displays on all four DUs. With the
reversion switch selected to “1” or “2”, the op-
erational IC/SG on the selected side will con-
tinue to drive the on-side DUs plus the failed
side DUs. In this case, the failed side DUs
will only be repeaters of the operational side
DUs and thus not independent. ADC and
AHRS information will be displayed only
from the units on the same side as the operat-
ing IC-600. The failed side display controller
and bezel buttons will not be usable. The MFD
display and functions will not be available
since an EICAS format will be displayed on
DU2 and DU3.
IC/SG POWER SOURCE
The number 1 and 2 IC-600 DGCs are powered
from the left and right essential busses re-
spectively. The circuits are protected with cir-
cuit breakers labeled IC/SG 1 and IC/SG 2 on
the pilot and copilot circuit breaker panels,
within the INSTRUMENT/INDICATIONS
group.
LEARJET 45 PILOT TRAINING MANUAL
16-7
FOR TRAINING PURPOSES ONLY
FlightSafety
international
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