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 | 144
FOR SIMULATION USE ONLY – NOT A TRAINING AID
The compass rose contains an aircraft symbol, located at the centre of the scale,
which always points towards the top of the display. The ground track pointer on the
HSI indicates the current ground track of the aircraft on the compass rose.
HEADING READOUT
The heading readout on the HSI displays the current heading of the aircraft, from
001° to 360°, inside a box with an attached carat that points to the top point on the
compass rose.
The heading is appended outside of the box with either a ° or a T to indicate that the
current compass setting is either magnetic or true.
HEADING ANNUNCIATOR
The heading annunciator displayed in amber text indicates an error in the heading
readout, which occurs when the difference between the heading data from the two
IACs is greater than 6° plus half of the aircraft bank angle (when the bank angle is
less than 6°) or greater than 12° (when the bank angle is between 6 and 20°
inclusive).
If the aircraft bank angle is greater than 20°, the heading data is not checked for
errors. The annunciator is also displayed if one of the IACs reports valid data and
the other IAC does not.
HEADING BUG
The heading bug element on the HSI is made up of two parts: the heading bug and
the heading bug caption. The heading bug is positioned on the outside edge of the
compass rose such that the triangular notch is aligned with the current heading bug
value, and it rotates with the compass rose to maintain this alignment.
The heading bug caption, located above the lower right LSK, displays the current
heading bug value in a digital readout and allows the operator to modify the heading
bug value using the UFCP. When the lower right LSK is pressed on the MFD, the
UFCP is changed to display the SYS Heading Level 2 page with the heading (W2)
selected for entry.
Entry of a new heading can be accomplished by either turning the UFCP data entry
knob until the new value is reached or by entering a new value with the number
keys and then pressing the ENT key. The heading bug value can also be set to the
aircraft current heading by pressing the lower right LSK for 1 second.
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