PRIMUS
r
1000 Integrated Avionics System
A28--1146--112--00
Electronic Flight Instrument System (EFIS)
4-36
-
IAS and baro altitude must be valid on both PFDs.
-
There are no SG, AHRS, or ADC reversions.
-
There are no comparison monitor annunciations
-
Two symbol generators must be operational.
If these criterias are not met when the APR mode is selected, the
system defaults out of CAT2 because it is programmed to assume
that the pilot does not care to perform the ILS approach with the
CAT2 monitors active. There is no approach category annunciation
given on the PFD in this case. On the other hand, if CAT2 conditions
were met, but then lost, CAT1 flashes for 5 seconds and goes on
steadily.
D
CAT2 Deviation Scale and Pointer
-- When the CAT2 mode
annunciation is displayed, as shown in figure 4--21, the ILS
excessive deviation monitors are active. If the localizer deviation
exceeds the CAT2 window requirements with radio altitude less than
500 feet, the deviation pointer and scale are changed from green to
amber. The scale also flashes. The display reverts back to green if
the deviation is brought back within the threshold. The same logic
and symbols apply to the glideslope deviation scale. In addition, the
CAT2 annunciation turns amber and flashes. The monitors are
independent with the thresholds set in accordance with regulatory
guidance for Category 2 ILS operations.
