Attitude Director Indicator (Adi) - Aspen Avionics Evolution Backup Display EFD1000 Pilot's Manual

2.3.2.1. Attitude Director Indicator (ADI)

The Attitude Director Indicator (ADI) features a conventional blue (sky) over brown
(ground) background, with a white horizon line dividing the two areas. A triangular
Aircraft Reference Symbol (Ref. 17) is in a fixed position and shows aircraft attitude
relative to the horizon.
The pitch scale (or ladder) indicates degrees of nose up (blue) or nose down (brown)
pitch relative to the apex of the aircraft symbol. Minor pitch marks are shown every
2.5º up to +/-20º of pitch, with major pitch marks every 10º up to +/-90º of pitch. The
distance between pitch marks is greater than on most mechanical attitude indicators,
making it easier for the pilot to fly more precise pitch attitudes.
At extreme pitch attitudes (above 30º nose up or below 25º nose down), red Unusual
Attitude Recovery chevrons come into view, pointing towards the horizon or ground
as applicable (see Chapter 4, Section 4.2.1.2. Pitch Scale). At extreme pitch attitudes,
some sky (blue) or ground (brown) will always be displayed to help maintain situational
Figure 2-17
awareness, even though the horizon line may be off-scale.
Slip/Skid
At the top of the ADI are the roll scale, roll pointer, and slip/skid indicator (Figure 2-17).
The roll scale is indicated by tick marks at 10º, 20º, 30º, 45º, and 60º on both sides of the
zero roll inverted solid white triangle. The 45º marks are represented as hollow triangles.
Slip/skid is indicated by the lateral position of the white rectangle under the roll pointer.
One rectangle width is equivalent to one ball width of a conventional inclinometer.
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Evolution Backup Display Pilot's Guide 091-00027-001 REV A
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