Specifications

SECTION III
MODEL 560 INSTRUMENTATION AND AVIONICS
ELECTRONIC ATTITUDE DIRECTOR INDICATOR (EADI)
Certain displays form a permanent part of the electronic attitude director indicator (EADI) portion of the
Primary Flight Display (PFD). The displays are: the blue and brown sphere, the pitch and roll attitude
reference marks, the airplane symbol, and the inclinometer which is fixed to the lower part of the PFD.
Some annunciations which are presented in the EADI display are annunciations for other systems which are
discussed under the headings of those systems, since they are not associated with EADI information. The
flight director command bars will be in view on power up unless there is no lateral mode selected. The
single-cue flight director presentation is the power-up mode.
Other displays are present when selected or during certain phases of a flight. When not in use, the
displays are removed from view. The displays are:
Decision Height - The decision height is a three-digit display identified DH (white) in the
lower center-right side of the EADI presentation. The value of the
decision height is identified in blue numbers. It is set by rotating the DH
set knob on the display controller. Full counterclockwise rotation
removes the display from view. A decision height annunciation (DH in
amber inside a white box) appears in the upper left of the EADI display at
radio altitudes less than or equal to the decision height setting and
flashes for ten seconds. Decision height will not be annunciated until it
is armed. Arming occurs when the “weight on wheels” switch senses
“in air” and a radio altitude of 100 feet greater than the selected decision
height for at least five seconds.
Flight Director Armed mode annunciations appear in white at the top left (lateral modes)
Mode Annunciators - and the top right (vertical modes) of the EADI presentation. Captured
mode annunciations appear in green. When a mode is not selected, the
annunciation is not present. As a mode transitions from armed to
captured, a white box is drawn around the annunciation for five seconds.
Marker Beacon - Marker beacon information appears below the glideslope indicator when
ILS is tuned. A white box, in which the appropriate letter will flash when
a marker beacon is passed, will be located in that position when a
localizer frequency is tuned on the NAV control. Outer marker is
identified with a blue "O", middle marker by an amber "M" and inner
marker by a white "I".
Comparison Monitors - Amber radio altitude comparison monitor warnings (RA), attitude
comparison monitor warnings (ROL, PIT, ATT), and localizer and
glideslope comparison monitor warning (LOC and GS) are located at the
lower left side of the attitude display. Parameters for the illumination of
comparator warnings are discussed under Comparison Monitor, below.
Flight Director The green flight director couple arrow is positioned at the top, center of
Couple Arrow - the PFD. The arrow is left pointing or right pointing to indicate which
flight director the autopilot is coupled to. (This display is always
present.)
Category Two Approach - CAT2 (green), annunciated at the upper right of the EADI presentation,
indicates that category two approach parameters have been met and the
excessive deviation monitor has been enabled. A green category two
approach window will be displayed around the center of the glide slope
indicator. After a CAT2 condition has been established, if any one of
several conditions should go invalid (except for autopilot engaged) the
green CAT2 annunciator will be replaced by a flashing CAT2 legend,
which will flash for ten seconds and then go steady. The CAT2
annunciation will be removed if the autopilot is disengaged or both DHs
are set above 200 feet inclusive.
I 56OMB-01 Configuration AA 3-53