777 AIRCRAFT MAINTENANCE MANUAL

ILS -EFIS ILS CONTROLS

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777 AIRCRAFT MAINTENANCE MANUAL

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ILS -PFD DISPLAYS

ILS Indications
These are the ILS indications on the PFD:
*
Localizer frequency or identifier

*
ILS course

*
Localizer deviation scale and pointer

*
Glideslope deviation scale and pointer

*
ILS deviation warnings.

Display Source Priority
The flight crew cannot manually select a multi-mode receiver (MMR) for the PFD. When a MMR fails, the AIMS selects another receiver to show on the PFD. LOC and G/S flags show on the PFDs when all MMRs fail.
This is the AIMS priority selection of ILS display data on the PFD:
Captain PFD  L, C, R 
First Officer PFD  R, C, L 

Localizer Frequency and Identifier
The localizer frequency or four letter identifier shows at the top left corner of the PFD in white. The frequency shows until the MMR detects the ILS station Morse code identifier. When the station identifier is present, it replaces the frequency.
EFFECTIVITY
BEJ ALL

ILS Course
The ILS course shows to the right of the localizer frequency or identifier in white. It is a three digit display with a range of 1 to 360 degrees.
Localizer and Glideslope Deviation
The localizer deviation scale and pointer show at the bottom of the attitude display. The scale is a standard four dot scale where one dot equals 1 degree of deviation.
The scale can show in the standard display or the expanded scale where a 2 dot scale replaces the four dot scale. In the expanded scale, each dot equals 0.5 degrees of deviation.
The expanded scale shows when these conditions occur:
*
LOC deviation is less than 5/8 dot

*
The autopilot or flight director is engaged in the LOC or
ROLLOUT mode

*
ILS course and airplane track are within 5 degrees of each other

*
RA is less than 200 feet.

The glideslope deviation scale and pointer show to the right of the attitude display. The scale is a standard four dot scale where one dot equals 0.35 degrees of deviation. There is no expanded scale for glideslope deviation.
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ILS -PFD DISPLAYS

ILS Deviation Warning
These are the two types of ILS deviation warnings:
*
Localizer deviation warnings

*
Glideslope deviation warnings.

Localizer deviation warnings occur between 0 and 500 feet RA with localizer captured. Glideslope deviation warnings occur between 100 feet and 500 feet RA with glideslope captured. Localizer deviation warnings occur when deviation is more than 1/4 dot or there is a localizer capture fail. Glideslope deviation warnings occur when the deviation is more than 7/8 dot. The deviation warnings cause the scales and the pointers to turn yellow and blink at a 5Hz rate.
Backcourse Deviation Indications
For backcourse indications, the glideslope pointer goes out of view and the localizer pointer moves in reverse operation. AIMS shows backcourse indications when the ILS course and airplane track is more than 90 degrees apart.
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777 AIRCRAFT MAINTENANCE MANUAL

ILS -PFD DISPLAYS

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ILS -PFD NCD AND INVALID ILS DISPLAYS

Frequency or Identifier
The ILS frequency or identifier does not show when the ILS input frequency goes invalid or if the selected frequency is not a valid localizer frequency.
ILS course
Dashes replace the ILS course display when the input goes NCD. The course display goes out of view when the course input goes invalid.
Localizer Pointer and Scale
The localizer scale remains in view and the localizer pointer goes out of view if:
*
The localizer deviation is NCD

*
The ILS course is invalid or NCD

*
The airplane track is NCD or invalid.

The amber LOC flag replaces the localizer scale and pointer when the localizer deviation goes invalid.
Glideslope Pointer and Scale
The glideslope scale stays in view and the glideslope pointer goes out of view when the deviation goes NCD or when the airplane is in a backcourse configuration. The amber G/S flag replaces the glideslope scale and pointer when the glideslope deviation goes invalid.
　
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