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data. The approach selector has these positions:
* Off - no ILS data on indicator
* APP - ILS localizer and glideslope data shows
* B/CRS - back course ILS localizer data shows.
Indications
When the selector is in the OFF position, the localizer and
glideslope deviation bars do not show. When the selector is in
the APP position, the localizer and glideslope deviation bars
show. When you select B/CRS, the localizer deviation bar
reverses polarity for the approach display and the glideslope
deviation bar goes out of view.
When the indicator receives invalid ILS data, the localizer or
glideslope deviation bars go out of view and the glideslope flag
or localizer flag shows.
When the ILS data is no computed data (NCD) for localizer or
glideslope data, the related deviation bar goes out of view.
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General
To show ILS displays on the ADI you must tune a valid ILS
frequency on the NAV control panel and select it to the active
display window.
Normal Display
The localizer deviation pointer and scale show at the bottom of
the attitude display. The scale is a standard four dot scale. One
dot equals 1 degree of deviation. The deviation indication
shows deviation to the left or right of the runway centerline. The
localizer scale shows in white and the localizer pointer shows
in magenta.
The localizer scale can show the standard display or the
expanded scale. A two-dot expanded scale can replace the
four-dot scale. For the expanded scale, each dot equals 0.5
degrees of deviation. The white expanded scale goes to amber
and flashes when the autopilot sends an ILS deviation warning.
The expanded scale shows for these conditions:
* LOC deviation is less than 5/8 dot
* LOC or APP mode is engaged
* ILS course and the airplane track are within 5 degrees of
each other
* An autopilot is in CMD.
The glideslope deviation pointer and scale show to the right of
the attitude display. The scale is a standard four-dot scale. One
dot equals 0.35 degrees of deviation. The pointer gives fly-to
commands to intercept the glideslope beam. The glideslope
scale shows in white and the glideslope pointer shows in
magenta. There is no expanded scale for glideslope deviation.
The ILS station frequency and course show above and to the
right of the ADI. If the ILS ground station transmits a morse
coded station identifier, the stations letter identifier replaces the
numeric frequency display when the receiver captures the
signal.
Rising Runway
The rising runway shows when there is a LOC signal capture
and the radio altitude is below 2500 feet. The symbol goes out of
view above 2500 feet. The rising runway symbol is green with a
magenta stem.
The rising runway symbol represents the radio altitude above
the runway. It moves laterally with the localizer deviation
pointer to show localizer deviation. The symbol starts to move
when the radio altitude is 200 feet. It touches the airplane
symbol when the radio altitude is 0 or at touchdown.
ILS - ADI DISPLAYS
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34-31-00-017
Fail Display
The amber LOC flag replaces the localizer deviation pointer
and scale when the localizer receiver function has a failure. The
amber G/S flag replaces the glideslope deviation pointer and
scale when the glideslope receiver function has a failure.
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