AHRS - INDICATORS
ATTITUDE DIRECTOR INDICATOR (ADI)
• ATTITUDE INDICATOR
Displays pitch attitudes between ±90° and roll attitudes through ±180°.
• ARTIFICIAL HORIZON
The natural horizon is represented as a white horizontal line that joins
the bottom edge of the cyan field (the sky) with the top edge of the
brown field (the surface of the earth).
• AIRCRAFT REFERENCE SYMBOL
The symbol is represented in white at the center of the ADI. The
position of the symbol in relation to the attitude pitch tape indicates the
number of degrees the aircraft is nose-up or nose-down. The aircraft
reference symbol indicates bank angle changes, the magnitude of the
change (in degrees) and the rate at which the bank angle is changing.
• ATTITUDE PITCH TAPE
The pitch tape is displayed in the center of the ADI with white linear
markings that move up or down behind the aircraft symbol as the pitch
attitude changes.
• PITCH ATTITUDE WARNING INDICATOR (CHEVRONS)
When exists an excessive pitch angle (+21° nose-up or -9° nose-down)
the red warning indicators are displayed. The indicators increase in
size as the nose-up or nose-down angle increases.
• ROLL SCALE
A linear roll scale is visible at the top of the ADI. An inverted triangle
marks 0° and the 45° angle of bank.
• ROLL POINTER AND SLIP/SKID INDICATOR
Bank angle and roll rates are identified by a white segmented triangle
called the roll pointer. The bottom segment of the roll pointer is the slip/
skid indicator. It identifies a slip or skid by displacing left or right of the
top segment of the roll pointer. As long as the aircraft is flown in
coordinated flight, the roll pointer and slip/skid indicator form a white
triangle. When a slip or skid is made, the slip/skid indicator moves
sideways and turns amber. When the aircraft rate of turn is too great
for the existing angle of bank, the aircraft is in a skid. The slip/skid
indicator displaces outside the roll pointer away from the turn direction.
When the aircraft rate of turn is too slow for the existing angle of bank,
the aircraft is in a slip. The slip/skid indicator displaces inside the roll
pointer in the direction of the turn. The skid pointer displaces laterally
and turns amber when lateral acceleration exceeds 0.1 g. In analog
terms, when the skid pointer displaces laterally and turns amber, the
aircraft yaw is one ball out of trim. When lateral acceleration, pitch or
roll information from the AHRS becomes unreliable, the slip/skid
indicator is removed from the PFD and is replaced with an amber X.
HORIZONTAL SITUATION INDICATOR (HSI)
COMPASS CARD
• When FULL Compass HSI is selected, a 360° rotating compass card is
displayed.
• When ARC Compass HSI is selected, the rotating compass card
shows an arc of 90° centered on the current heading.
• At power-up the FULL Compass HSI is automatically selected.
LUBBER LINE
• When FULL Compass HSI is selected, the heading reference (lubber
line) is shown as a triangle outlined in white at 12 o'clock position.
• Current heading value is read on the compass card.
HEADING DIGITAL READOUT
• When ARC Compass HSI is selected, the current aircraft heading is
displayed by a digital readout at 12 o'clock position.