2. c. (8) Category II (CAT 2) ILS Operation
CAT1/CAT2 annunciations and
ILS deviation monitors have been added
to the PFD display format for aircraft operators receiving CAT2
certification (CAT2 wiring installed).
(a) CAT1/CAT2 Annunciations -
The CAT2 annunciation is displayed
automatically when the APR mode is selected on the flight
guidance controller and lateral and vertical deviation valid
with the displays configured as follows:
● FWC JIA-82 (CATII Installed) will be read by the FWC at
. ~fle~L~pset < 200 feet on at least one side
● One radio altimeter (minimum) valid
● Two symbol generators (minimum) valid
● On-side ILS (NAV/ILS) source selected for display on each
side and valid
. Either dual couple mode or radio altitude greater than
800 feet (Dual couple mode occurs at approximately
1200 feet)
CAT2 is annunciated in green directly below the FD vertical
mode window (Figure 205)
when all the conditions listed above
are met.
In the event that one of the enabling conditions
changes, the green CAT2 is replaced with an amber CAT1. CAT1
appears flashing for 5 seconds and then remains displayed
steady. Changes back to CAT2 are handled the same way in the
event that the enabling condition is restored. The CAT2
annunciation is presented only if the displays are configured
as above.
If these conditions are not met when APRmode is
selected, no CAT1/2 mode annunciations are displayed.
(b) Excessive Deviation Monitor - When the CAT2 mode annunciation
is active, and displayed radio altitude is less than 500 feet,
the excessive deviation monitor is activated. When the
threshold of the localizer (LOC) or glideslope (GS) deviations
are exceeded, the deviation pointer and deviation scale are
turned amber and are flashed.
This condition remains as long
as the deviation is above the appropriate threshold.
The
threshold for LOC and GS are as follows:
Localizer
320 /LA
Glideslope
~65 PA
Excessive deviation indications are also shown on the ND
compass mode when the CAT2 mode is active.
CAT2 will be
cancelled:
● at touchdown
●
when there is a change in the selected lateral FD mode
●
when there is a change in the selected vertical FD mode
● when approach mode is deselected.
22-14-00
Page 227
Apr 15/93
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