Glideslope deviation pointer, annunciator,
and scale. The glideslope deviation pointer shows
aircraft deviation from the center of the glideslope beam.
The G annunciator on the glideslope deviation pointer
indicates that the information being presented is
glideslope deviation. Deviation from the center of the
glideslope beam is measured by the glideslope scale.
The distance between two dots is equal to a 0.35 degree
deviation. The glideslope display will not be present on
the EADI unless a valid ILS frequency has been tuned.
Aircraft symbol. The aircraft symbol
serves as a stationary representation of the aircraft.
Aircraft pitch and roll attitudes are displayed by the
relationship between the fixed miniature aircraft and the
movable attitude sphere. The inverted V shaped
miniature aircraft symbol is flown to align with the flight
director command cue in order to satisfy the commands
of the selected flight director mode.
Marker beacon annunciator. Reception
of a marker beacon signal is indicated on the EADI by
the illumination of the appropriate marker beacon
annunciator. Possible annunciations are outer marker
(0, blue), middle marker (M, amber), and inner marker (I,
Autopilot engagement annunciator.
Autopilot engagement is indicated on the EADI by an
annunciator placarded AP ENG (green).
Radio altitude display. Radio altitude is
presented by a four-digit display from -20 feet to 2500
feet above ground level (AGL). Radio altitude is
displayed in blue numbers followed by RA in white
letters. Display resolution between 200 and 2500 feet
AGL is in 10-foot increments. Display resolution below
200 feet AGL is in 5-foot increments. The radio altitude
display will disappear from the EADI when radio altitude
is above 2500 feet AGL.
Decision height annunciator. When radio
altitude is less than 100 feet above the selected decision
height, a white box will appear adjacent to the radio
altitude display. When the aircraft is at or below decision
height an amber DH annunciator will be illuminated
inside the white decision height display box on the EADI.
Rising runway radio altitude display. A
miniature rising runway symbol displays absolute altitude
reference above the terrain. The rising runway appears
at 200 AGL and contacts the aircraft symbol at
Inclinometer. The inclinometer provides
the pilot with a display of aircraft slip or skid for
pointer and scale. When the flight director navigation
source is other than a localizer frequency, rate-of-turn is
displayed by a pointer and scale on the EADI. A
standardrate turn (3 degrees per second) is indicated
when the turn needle is deflected until the needle covers
the left or right rate-of-turn scale mark. When the flight
director navigation source is a localizer frequency, the
rate-of-turn pointer an scale display will become an
expanded localizer pointer and scale display. The
expanded localizer pointer receives raw localizer data
from the navigation receiver. The expanded localizer
pointer becomes an extremely sensitive reference
indicator of aircraft position with respect to the center of
the localizer course. From the center of the expanded
localizer scale to the left or right scale index mark equals
33 feet deviation from the center of the localizer course.
When back course (BC) has been
selected on the flight director, or
when the selected course is more
reversed to provide proper sensing
centerline, and amplification will be
reduced by one half.
Decision height display. Decision height
is displayed on the EADI by a three-digit display in blue
numbers followed by DH in white letters. Decision
heights may be set into the display by the decision
height setting control on the respective display controller.
Decision heights in the 0 to 200 foot range are set into
the display in 5-foot increments. Decision heights in the
200 to 990 foot range are set into the display in 10-foot
Air data command display. Flight director
air data command modes are vertical speed (VS) or
indicated air speed (IAS). When an air data command
mode has been selected on the flight director mode
selector panel, the command reference will appear on
the EADI in blue numbers below CMD in white letters.
The autopilot pitch wheel on the autopilot control panel is
used to change the air data command reference number
when operating in the VS or IAS mode. When a vertical
mode other than VS or IAS is selected, the air data
command display will disappear from the EADI.
Pitch and roll command cue. The flight
director pitch and roll command cue displays the
computed commands required to capture and maintain a
desired flight path. The inverted V shaped miniature
aircraft symbol is flown to align with the flight director
command cue in order to satisfy the commands of the
selected flight director mode. The cue will be removed