ATTITUDE DIRECTOR INDICATOR (ADI)
Certain displays form a permanent part of the attitude direction indicator (ADI) 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, the conventional inclinometer which is fixed to the lower part
of the PFD, and the electronic slip-skid indicator. Some annunciations which are presented in the
ADI display are annunciations for other systems which are discussed under the headings of those
systems, since they are not associated with ADI 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:
CM 1-2 FAIL Indicates pilot or copilot Config Fail Flags are set to FAILED.
CM MISMATCH Indicates the System Configuration Comparison Monitor Flag is FAILED and
the on-side and cross-side Config Fail Flags indicate NOT FAILED.
Decision Height
(Radio Alt)
Minimums
The radio altitude minimums readout is a three-digit display identified RA
(white) located below and right of the attitude sphere. The value of the
decision height is identified in cyan 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 (MIN in amber inside a
black box with white background) appears in the upper left of the attitude
sphere 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
exists for at least five seconds.
Flight Director
Mode Annunciators
Armed mode annunciations appear in white at the top left (lateral modes)
and the top right (vertical modes) of the ADI 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. Outer marker is identified
with a cyan "O", middle marker by an amber "M" and inner marker by a white
"I".
Comparison
Monitors
Amber attitude comparison monitor warnings (ROL, PIT, ATT), and localizer
and glideslope comparison monitor warning (LOC, GS and ILS) are located
at the lower left side of the attitude sphere. Parameters for the illumination of
comparator warnings are discussed under Comparison Monitor, below in this
section.
Cessna Citation XLS - Instrumentation & Avionics
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