Efis Controls
To show ILS data on the captain’s and F/O’s displays, set the mode selector on the EFIS control panel to the APP position.
Dfcs Controls
The digital flight control system (DFCS) mode control panel (MCP) supplies runway heading data to the display electronics unit (DEU) for ILS displays. You use the DFCS MCP course selector to set the course for approach.
The DEU uses the course input and ILS deviation to calculate the airplane’s deviation from the runway centerline. The DEUs compare the course input to the airplane’s track to calculate if this is a back course approach. If the course input and airplane track are different by more than 90 degrees, the DEUs show backcourse ILS displays.
Audio Control Panel Controls
The audio control panels (ACPs) lets the crew listen to ILS station audio or the morse code station identifier.
You use the ACP receiver switches to select the ILS audio you want to listen to. The NAV 1 receiver switch selects the MMR 1 audio and the NAV 2 receiver switch selects the MMR 2 audio. The filter switch lets you listen to only voice audio in the voice (V) position. The range ® position lets you listen to the station morse code identifier. With selector in the both (B) position you can listen to both the voice audio and the morse code station identifier.
ILS - STANDBY ATTITUDE INDICATOR DISPLAYS
General
The standby attitude indicator gives the crew an alternate attitude indication source. The indicator also provides ILS data. You use the approach selector on the indicator to show ILS 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.
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.