The Annunciation Window appears to the right of the Vertical Speed
Indicator and displays abbreviated annunciation text for aircraft alerts.
Warnings appear in red, cautions in yellow, advisory alerts in white, and safe
operating annunciations in green. New alerts are displayed at the top of the
Annunciation Window, regardless of priority. Once acknowledged, they are
sequenced based on priority.
Critical values generated by redundant sensors are monitored by
comparators. If differences in the sensors exceed a specied amount, the
Comparator Window appears in the upper right corner of the PFD and the
discrepancy is annunciated in the Comparator Window as a MISCOMP
(miscompare). If one or both of the sensed values are unavailable, it is
annunciated as a NO COMP (no compare).
Reversionary sensor selection is annunciated in a window on the right side of
the PFD. These annunciations reect reversionary sensors selected on one
or both PFDs. Pressing the SENSOR softkey accesses the ADC1, ADC2,
AHRS1, and AHRS2 softkeys. These softkeys allow switching of the sensors
being viewed on each PFD. With certain types of sensor failures, the system
may make some sensor selections automatically. The GPS sensor cannot be
switched manually.
Marker Beacon Annunciations
Marker Beacon Annunciations are displayed on the PFD to the left of the
Selected Altitude. Outer marker reception is indicated in blue, middle in
yellow, and inner in white. Refer to the Audio Panel and CNS section for
more information on Marker Beacon Annunciations.
Figure 7-29 – Marker Beacon Annunciations
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