Electronic Flight Management System interacts with Flight Management System to provide outputs on a plasma display.
EFIS consists of Electronic Horizontal Situation Indicator, Electronic Attitude Direction Indicator, Control Panel, Symbol Generator and the Remote Light Sensor
Colour Coding in EFIS
Red, Yellow, Green, Blue Magenta and Green colours are used in airbus aircrafts
Red indicates Warnings, Flight Envelopes and System Limits while Yellow is used for Cautions and Abnormal Sources
Green is used for indicating Selected Mode and Blue is used for sky colouring
Magenta is used for Deviation Pointers and Green or Magenta is used for flight Director Bars
EFIS Symbols used include those for VORTAC – VOR – DME – NDB, Airports, off-route, active and other Way Points
Wind Directions, Selected Runway and Extended Centre-line are also indicated in EFIS
VOR, ILS, Map and Plan Display Modes of EHSI
VOR mode displays VOR on the full compass rose while ILS mode displays ILS on the full compass rose
Map mode displays a Moving Map Display along with TCAS, EGPWS and Weather Radar inputs
Plan mode displays a static map for re-planning routes in air
Centre Map and Expanded VOR or ILS Display Modes of EHSI
Expanded VOR displays VOR information in 90° of compass along with weather radar information
Expanded ILS displays ILS information in 90° of compass with weather radar information
Centre Map displays a moving map with aircraft in the centre of the screen
Failure Warnings in EHSI
Failure annunciators warn about failure of data sources like Heading, VOR, ILS Localiser or Glide-path
Weak signals on weather radar are also indicated in EFIS
Mis-match in inputs from different sources are also indicated in EFIS