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These switches cause the display of the following symbols to supplement the
basic map display data.
VOR/ADF----- VOR and ADF bearing data.
NAV AID ----- naviaids such as VOR, VORTAC.
ARPT ---------- airport
RTE DATA ----- route data: waypoint altitude and estimated time of arrival.
WPT ------ Waypoints not in the selected flight plan.
[3] The EADI has one basic display mode. The EADI displays airplane attitude,
flight director commands, Mach, airspeed, ILS data and radio altimeter data. At
the top of the EADI, autothrottle and autopilot annunciations are provided for
both “armed”and “engaged” conditions. A mechanical inclinometer is installed
at the bottom of the EADI. It serves as a slip indicator using a black ball against
a white background.
Fig 21-3 EADI display
[4] The typical EHSI displays include several formats, they are VOR/ILS mode,
NAV mode, MAP mode, CTR MAP mode, and PLAN mode.
 The VOR mode is used enroute with VOR and DME station inputs. The ILS
mode is used for landing and uses ILS and DME station inputs. For the VOR
and ILS systems, the EHSI has two different types of displays (FULL and EXP
VOR/ILS) which are selected on the EFIS control panel. The “FULL VOR/ILS”
display includes a 360-degree compass rose with the airplane symbol in the
center. The “EXP VOR/ILS” display includes a 70-degree. compass arc with the
airplane symbol at the bottom center, this display is used to more easily read the
airplanes heading and track value.
 The NAV displays are referenced to the airplanes magnetic track.. The NAV
mode displays selected FMC data. The display shows the aircraft position
relative to the next waypoint and the vertical and horizontal flight path. Like the
VOR/ILS mode, the NAV modes have selectable 360-degree and 70-degree
compass displays.
 The PLAN mode is primarily used to set up the flight plan prior to flight.This
mode displays track, selected and actual heading, distance and estimated time of
arrival to the next waypoint.
The MAP and CTR modes display the airplanes position with respect to the
flight plan. The entire display is dynamic, so it translates and rotates as the
airplane moves. These modes are generally used during flight to monitor
airplane position along the selected flight path stored in memory. The center
map mode display includes a 360-degree compass rose. The map mode display
includes only a 70-degree compass arc which is used to more easily monitor the
airplanes heading, track, and progress along the selected route. Also, weather
radar data can be shown in both the map and center map modes.
[5] The EFIS symbol generator processes data from the EFIS control panel and
navigation and guidance systems to provide video signals to the EADI and
EHSI displays. The symbol generator weighs 21 pounds (9.5kg) and is packaged
in a 6MCU case. Input data is received on many ARINC 429 data buses, as well
as ARINC 453 weather radar data buses and discrete inputs. The main
processing circuitry includes a central processing unit, memory unit, raster and
stroke generators, and input/output buffer circuits. Six different colors can be
generated at two different intensity levels.
[6] EADI and EHSI display unit uses a cathode ray tube (CRT) for the display.
The CRT use 115 volt ac, 400Hz power ,the EFIS symbol generator provides
analog deflection and digital video signals to the CRT. There are three electron
guns, one each for red, green, and blue. By controlling the three guns, the
symbol generators can produce the colors red, green, and blue, as well as
combinations resulting in the colors yellow, cyan (light blue), magenta (pink),
and white. If one or more electron guns fail, the display will revert to a
monochromatic display.
[7] Normally, the left symbol generator is the source for the left displays and the
right symbol generator is the source for the right displays. If a symbol generator
fails, the EFIS transfer switch can be used to allow one symbol generator to be
the source for all the displays. When the switch is in the “BOTH ON 1” position,
both EADI and EHSI are driven by the left symbol generator. In the “BOTH ON
2” position, they are all driven by the right symbol generator.
EXERCISE
A. Find out the explanations of the following words in your “English-chinese
technical dictionary”
1. decision height [ P1-40 ]
2. EADI [ P1-51 ]
3. EHSI [ P1-51 ]
4. symbol generator [ P1- 148 ]
5. waypoint [ P1-170 ]
6. flight plan [ P1-63 ]
7. mach number [ P1-96 ]
8. airspeed [ P1-6 ]
　
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