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 | 140
FOR SIMULATION USE ONLY – NOT A TRAINING AID
the centre of the display (i.e., the current altitude on the scale is covered up by the
digital altimeter readout).
ALTITUDE BUG
The altitude bug display on the altimeter consists of two parts, the altitude bug
setting readout and the altitude bug. The altitude bug is displayed in magenta and
displays the point on the scale that corresponds to the selected reference altitude.
The currently displayed range does not contain the altitude bug setting, half of the
bug is displayed pegged at the top or bottom end of the range to indicate if the
altitude bug setting is above or below the displayed range. The altitude bug setting
can be set or modified by pressing the PFD hard key on the UFCP.
ALTIMETER SETTING
The altimeter setting is displayed below the altimeter on the tape display and above
the altimeter on the dial display and indicates the current altimeter setting
displayed in either inches of mercury or millibars, depending on the current
selected pressure units. The altimeter setting can be set or modified using the baro
set knob or alphanumeric keypad on the UFCP.
RADAR ALTIMETER
The radar altimeter display consists of the characters RA in white with a digital
readout of the current radar altitude value below. The radar altimeter readout is
only displayed when the radar altitude is less than 2500 feet and the aircraft bank
angle is less than 30° or the pitch angle is less than 15° up or down.
When the radar altitude is less than the radar altimeter setting (set using the
UFCP), the readout flashes and changes colour to amber.
Vertical Speed Indicator
The vertical speed indicator (VSI) displays the vertical speed of the aircraft as
provided by the air data computer (ADC). Air data information is supplied to the IAC
on dual data buses.
The VSI displays the current aircraft vertical speed in ft. /min on a digital readout
when vertical speed is 200 ft. /min or greater, as well as a scale with a pointer.
On the tape display, the pointer is a white arrow that moves up or down the scale
indicating the current value of vertical speed. On the dial display, the pointer is
displayed as a white band from 0 ft. /min up (or down) to the current value of
vertical speed.
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