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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