ADI CAUTION OR FAILURE ANNUNCIATIONS
EXCESSIVE ATTITUDE DECLUTTER
When roll or pitch attitude becomes excessive, certain symbology is removed from the PFD in order
to declutter the display. A roll attitude of greater than 65° in either direction, a pitch attitude of greater
than 30° nose up or 20° nose down will trigger the declutter mode. Many of the digital readouts,
failure flags, comparison monitor annunciations, and mode annunciations are removed from the ADI
display.
When the roll attitude becomes less the 63°, the nose up pitch attitude less than 28°, and the nose
down attitude less than 18°, the removed symbology will be restored.
HORIZONTAL SITUATION INDICATOR (HSI)
The displays in the HSI portion of the PFD are discussed below in three categories: FULL TIME
which are always present, PART TIME which are sometimes present, and the arc mode.
Flight Director
Failure
If the flight director fails, the flight director command bars disappear and an
amber FD warning appears in the top left center of the display. All FD mode
annunciators will be removed.
Internal Failures A large red X will cover the face of the primary flight display.
Radio Altimeter
Failure
If the radio altimeter fails, the radio altitude readout will be replaced by an
amber -RAD-. If the low altitude awareness indication is present, it will be
removed.
Pointer/Scale
Failures (Glide Slope
[Vertical Deviation],
Altitude, Airspeed,
and Vertical Speed)
Failure of pointers/scales is indicated by: Replacing the digital readouts with
dashes, drawing a red X through the scale (IAS, ALT, GS only), and
removing the pointer (GS and VS only). The digital readout inside the vertical
speed scale will be removed.
Attitude Failure Attitude failure is annunciated by appearance of ATT FAIL in red in the
middle of the attitude sphere. The sphere will change to solid blue, and the
pitch scale and roll pointer will disappear.
Cessna Citation XLS - Instrumentation & Avionics
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