I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 137
FOR SIMULATION USE ONLY – NOT A TRAINING AID
Attitude Indicator
The attitude indicator is centrally located on the upper half of the PFD and informs
the pilot of the orientation of the aircraft relative to earth.
In the event that data is not available from the IRS, the attitude indicator is removed
from the display and replaced with a black background and a red X.
MISCOMPARE DATA
Each IAC continually compares primary flight data with the other IAC. If an IAC
detects the other IAC’s primary flight data is different by a preset margin or invalid,
both IACs will display a miscompare alert.
Miscompare alerts display as amber characters on a black background either on or
adjacent to the specific information on the PFD.
Miscompare alerts are provided for roll (ROL), pitch (PIT), heading (HDG), altimeter
(ALT), and airspeed (SPD).
HORIZON REFERENCE LINE
The horizon reference line provides a delineation between the attitude indicator
blue colour representing the sky and the brown colour representing the ground (or
earth’s surface). The horizon reference line with respect to the aircraft reference
symbol provides the pilot with an indication of aircraft pitch and roll attitude.
When the aircraft pitch attitude is zero, the horizon reference line passes behind
the centre circle of the aircraft reference symbol.
When the aircraft roll attitude is zero, the horizon reference line is aligned parallel
to the horizontal lines of the aircraft reference symbol.
The horizon reference line moves with respect to the fixed aircraft symbol and
accurately depicts current aircraft pitch and roll attitudes. The horizon reference
line provides the pilot with cues of pitch and roll rates and functions accurately
through 360° of roll and ±90° of pitch.
At pitch angles in excess of ±30°, the horizon reference line and the ground/sky
continues to remain visible. As the aircraft pitches upwards (nose rising), the
horizon reference line moves in a downward direction and as the aircraft pitches
downward (nose diving), the horizon reference line moves in an upward direction.
As the aircraft rolls clockwise (right wing moves downwards), the horizon
reference line rotates counter clockwise and as the aircraft rolls counter clockwise
(left wing moves downwards), the horizon reference line rotates clockwise.
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