
However, to extend battery life, the AFM pro-
cedure also calls for turning DU2 off with the
DU2 reversion switch, and selecting engine
page 1 on the #1 RMU. The right RMU can
then be used alternately for radio tuning and
for the navigation display, or the navigation
receivers (VHF, NAV and ADF) can be tuned
from the navigation display page and the VHF
Com can be tuned using the CDH (clearance
delivery head). It would be necessary to use
one of the RMUs to change the transponder
code, if required.
COMPARISON MONITOR
Comparison monitors provide indications to the
pilots that there is a difference between the data
displayed on each PFD. This monitoring is a
function within the IC-600(s) that compares
what is being displayed on one side with either
the cross-side displayed data or secondary
source data, depending on certain conditions.
The comparison is made when the pilot and
copilot have the same type, but different sources
selected for display. If the comparison check
indicates that the displayed information is out
of tolerance, then a comparison monitor an-
nunciation will be displayed on the PFD(s) for
that particular item. Both engine and airplane
systems are monitored.
The comparison monitor annunciators, shown
in Figure 16-32, are located in various posi-
tions on the PFD. They are cleared when the
miscompare situation has been corrected.
When annunciated, the amber signal(s) flash
for 10 seconds on the PFD(s), then go steady.
Airplane flight performance is compared
within each IC-600. The following parameters,
along with their annunciation, are monitored:
• Attitude (ATT) - Active when pitch and
roll comparators have tripped.
• Pitch (PIT) At 5 degrees
• Roll (ROL) At 6 degrees
• Heading (HDG) + 6 degrees
• Altitude (ALT) + 200 feet
• Airspeed (IAS) + 5 knots (MCH) + .01
Mach
• Localizer (LOC) Deviation 1/2 dot below
1200 feet
• Glideslope (GS) Deviation 1/2 dot below
1200 feet
• Instrument Landing System (ILS) - Active
when both LOC and GS comparators have
already been tripped.
A comparison of each sides CAS messages is
also performed. Each IC-600 will process the
CAS messages even though only one will be
driving the actual display. Each IC-600 will
perform a check of the active messages and
compare the list with the other IC-600. Should
a discrepancy be detected between the two
computers, an amber “CAS MSG” compara-
tor monitor warning will illuminate on the
PFDs (Figure 16-32).
Engine parameters that are monitored are N1,
N2 and ITT. Should an engine miscompare be
detected between Channel A and B of it’s on-
side DAU the respective amber CAS message
"L R DAU ENG MISCMP" will be displayed.
The miscompare monitor also compares the
following airplane system items:
• DC Bus Volts
• Emergency Bus Volts
• DC Bus Current (amps)
• Battery Temperature
• Main Hydraulic Pressure
• Brake Accumulator Pressure
• Oxygen Temperature
• Oxygen Pressure
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
16-44
FOR TRAINING PURPOSES ONLY
FlightSafety
international